java简单计算器源代码
用java代码写的简易计算器（可以实现基本的加减乘除功能）
⽤java代码写的简易计算器（可以实现基本的加减乘除功能）package A;import java.awt.*;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.event.MouseEvent;import java.awt.event.MouseListener;import javax.swing.*;public class Calcular3 extends JFrame implements ActionListener,MouseListener{private int m1=0,n=0;//private double m2=0;//运算的数private int flag=0;JFrame f;JPanel p1,p2,p3;JTextField t;JButton b1[]=new JButton[18];String b[]= {"1","2","3","4","5","6","7","8","9","0","清空","退格",".","=","+","-","*","/"};public Calcular3(){f=new JFrame("计算器");t=new JTextField(35);p1=new JPanel();p2=new JPanel();p3=new JPanel();f.setBounds(100, 100, 400, 200);f.add(p1,BorderLayout.NORTH);f.add(p2,BorderLayout.CENTER);f.add(p3,BorderLayout.EAST);p2.setLayout(new GridLayout(5,3));p3.setLayout(new GridLayout(4,1));p1.add(t);for(int i=0;i<14;i++) {b1[i]=new JButton(b[i]);p2.add(b1[i]);b1[i].addActionListener(this);}for(int i=14;i<18;i++) {b1[i]=new JButton(b[i]);p3.add(b1[i]);b1[i].addActionListener(this);}/*for(int i=0;i<18;i++) {b1[i].addActionListener(this);}*/f.setVisible(true);}//实现接⼝的⽅法public void mouseClicked(MouseEvent e) {}public void mousePressed(MouseEvent e) {}public void mouseReleased(MouseEvent e) {}public void mouseEntered(MouseEvent e) {}public void mouseExited(MouseEvent e) {}public void actionPerformed(ActionEvent e) {String str="";int i;for(i=0;i<=9;i++) {if(e.getSource()==b1[i]) {if(i==9) {n=n*10;}else {n=n*10+i+1;}str=String.valueOf(n);//整形n转换成字符串strt.setText(str);//显⽰到⽂本框上}}for(i=14;i<18;i++) {//+、-、*、/if(e.getSource()==b1[i]) {//匹配运算符m1=Integer.parseInt(t.getText());if(flag==15) {m2=m1+m2;}else if(flag==16) {m2=m1-m2;}else if(flag==17) {m2=m1*m2;}else if(flag==18) {m2=m1/m2;}else m2=m1;//若⽆连续的运算符运算，保存当前数据到m2 if(i==14) flag=15;else if(i==15) flag=16;else if(i==16) flag=17;else flag=18;str=String.valueOf(b[i]);t.setText(str);//显⽰到⽂本框上n=0;//还原，记录下次数据break;//找到匹配数据退出循环}}if(e.getSource()==b1[13]) {//=m1=Integer.parseInt(t.getText());if(flag==15) {m2=m2+m1;}else if(flag==16) {m2=m2-m1;}else if(flag==17) {m2=m2*m1;}else if(flag==18) {m2=m2/m1;}else m2=m1;str=String.valueOf(m2);t.setText(str);//显⽰到⽂本框上n=0;//还原，记录下次数据flag=0;//flag还原0，表明没有未处理的运算符}if(e.getSource()==b1[10]) {//各变量变为0 清空m1=0;m2=0;flag=0;n=0;t.setText("0");//显⽰到⽂本框上}if(e.getSource()==b1[11]) {//退格m1=(int)(Double.parseDouble(t.getText())/10);n=m1;str=String.valueOf(m1);t.setText(str);}if(e.getSource()==b1[12]) {//⼩数点m1=Integer.parseInt(t.getText());str=String.valueOf(m1+b[12]);t.setText(str);//显⽰到⽂本框上int j=0;for(i=0;i<=9;i++) {if(e.getSource()==b1[i]) {j++;m2=Math.pow(0.1, j)*Integer.parseInt(b[i]);str=String.valueOf(m1+m2);t.setText(str);//显⽰到⽂本框上}}}}//主函数public static void main(String[] args) {new Calcular3();}}。
JAVA简易计算器程序源代码
JAVA简易计算器程序源代码package myText;import java.awt.*;import javax.swing.*;import java.awt.event.*;import javax.swing.border.*;public class Calculator extends JFrame implements ActionListener{ private JPanel Panel1=new JPanel();private JPanel Panel2=new JPanel();private JTextField tfResult=new JTextField(25);private JLabel label=new JLabel("计算结果:");private String recentOperation=null;private String recentNum=null;private boolean isNew=true;public void addButton(Container c,String s){JButton b=new JButton(s);b.setFont(new java.awt.Font("SansSerif",0,12));b.setForeground(Color.red);b.setBorder(BorderFactory.createRaisedBevelBorder());c.add(b);b.addActionListener(this);}//end public void addButton(Container c,String s)public void actionPerformed(ActionEvent e){String s=e.getActionCommand();if(s.charAt(0)>='0'&&s.charAt(0)<='9'){if(!isNew){tfResult.setText(tfResult.getText()+s);}//end if(!isNew)else{tfResult.setText(s);}//end elseisNew=false;}//end if(s.charAt(0)>='0'&&s.charAt(0)<='9') else if(s.equals(".")){if(tfResult.getText().indexOf(".")!=-1)return;if(!isNew&&tfResult.getText()!=""){tfResult.setText(tfResult.getText()+".");}//end ifelse{tfResult.setText("0.");}//end elseisNew=false;}//end if(s.equals("."))else if(s.equals("=")){equalaction(e);}//end if(s.equals("="))else{if((tfResult.getText()).equals("")){return;}//endif((tfResult.getText()).equals(""))if(recentOperation!=null){equalaction(e);}//end if(recentOperation!=null) recentOperation=s;recentNum=tfResult.getText();isNew=true;}//end else}//end public void actionPerformed(ActionEvent e) void equalaction(ActionEvent e){if(recentOperation==null||recentNum==null||tfResult.getTex t().equals("")){ return;}//end if()double last=0,now=0;try{last=Double.parseDouble(recentNum);now=Double.parseDouble(tfResult.getText());}//end trycatch(NumberFormatException ne){recentOperation=null;recentNum=null;tfResult.setText("数据输入不合法");System.out.println("数据输入不合法");isNew=true;return;}//end catch(NumberFormatException ne)if(recentOperation.equals("+")){last+=now;}//end if(recentOperation.equals("+"))if(recentOperation.equals("-")){last-=now;}//endif(recentOperation.equals("-"))if(recentOperation.equals("*")){last*=now;}//endif(recentOperation.equals("*"))if(recentOperation.equals("/")){last/=now;}//endif(recentOperation.equals("/"))tfResult.setText(""+last);recentNum=tfResult.getText();recentOperation=null;isNew=true;}//end void equalaction(ActionEvent e)public Calculator(){tfResult.setBorder(BorderFactory.createLoweredBevelBorder ());tfResult.setEditable(false);tfResult.setText("0");tfResult.setHorizontalAlignment(SwingConstants.RIGHT);////本java源代码由839682048整理修改//////Panel1.add(label,FlowLayout.LEFT);Panel1.add(tfResult);////本java源代码由839682048整理修改///Panel2.setLayout(new GridLayout(4,4,2,2));String buttons="789/456*123-0.=+";for(int i=0;i<buttons.length();i++){< p="">addButton(Panel2,buttons.substring(i,i+1));}//end for()//本java源代码由839682048整理修改///this.getContentPane().add(Panel1,"North");this.getContentPane().add(Panel2,"Center");this.setResizable(false);this.setTitle("计算器");this.addWindowListener(newjava.awt.event.WindowAdapter(){public void windowClosing(WindowEvent e){System.exit(0);}});}//end public Calculator1()public static void main(String[]args){Calculator mf=new Calculator();mf.setBounds(200,200,400,400);mf.show();}//end main()}//end public class Calculator1extends JFrame implements ActionListener</buttons.length();i++){<>。
计算器的Java源代码
button_7.setText("7");
button_8.setFont(new Font("SansSerif",0,12));
button_8.setForeground(Color.blue);
button_4.setBorder(BorderFactory.createRaisedBevelBorder());
button_4.setText("4");
button_5.setFont(new Font("SansSerif",0,12));
button_5.setForeground(Color.blue);
//保存最近一次运算符
String recentOperation=null;
//保存最近一次的运算数据
String recentNum=null;
//描述当前输入状态，是重新输入还是接在后面，重新输入时为true
boolean isNew=true;
public Calculator(){
button_4.addActionListener(this);
button_5.addActionListener(this);
button_6.addActionListener(this);
button_7.addActionListener(this);
button_8.addActionListener(this);
JButton button_CE=new JButton();
java简单计算器源代码
简单计算器代码package calcultorthree;import java.awt.BorderLayout;//导入边界布局管理器类import java.awt.GridLayout;//导入网格布局管理器类import java.awt.T extField;//导入文本区域类import java.awt.event.ActionEvent;//导入事件类import java.awt.event.ActionListener;//导入事件监听者类import javax.swing.JButton;//导入按钮类import javax.swing.JFrame;//导入窗体import javax.swing.JPanel;//导入面板/***本例实现了简单计算器代码，具备加减乘除和正弦功能，旨在抱砖引玉。
熟悉java的同学，可以在此基础上实现更复杂的功能。
* author Fjsh*/public class CalcultorThree {//新建对象，在构造函数中进行初始化JFrame frame;//新建窗体对象JButton buttonzero,buttondot,buttonequal;//新建按钮“0”“.”“=”JButton buttonplus,buttonminus,buttonmultiple,buttondevision,buttonsin,buttontozero;//新建按钮“+”“-”“*”“/”“sin”和归零按钮JButton buttonone,buttontwo,buttonthree,buttonfour,buttonfive,buttonsix, buttonseven,buttoneight,buttonnine;//新建数字按钮“0”“1”“2”“3”“4”“5”“6”“7”“8”“9”JPanel panelwest,panelcenter,paneleast;//新建三个面板T extField tf;//新建文本区域对象public CalcultorThree(){//初始化对象tf=new T extField(30);//构造空文本字段，字符宽度为30frame =new JFrame("CalculatorThree");//构造窗体对象，名称为“CalculatorThree”panelcenter=new JPanel();//构造面板，放到窗体中央panelwest=new JPanel();//构造面板，放到窗体西边paneleast=new JPanel();//构造面板，放到窗体东边Handle h=new Handle();//新建Handle类对象，Handle类为事件监听类//创建数字按钮对象，1、2、3、4、5、6、7、8、9buttonone=new JButton("1");buttontwo=new JButton("2");buttonthree=new JButton("3");buttonfour=new JButton("4");buttonfive=new JButton("5");buttonsix=new JButton("6");buttonseven=new JButton("7");buttoneight=new JButton("8");buttonnine=new JButton("9");panelcenter.setLayout(new GridLayout(3,3));//设置面板布局为网格布局，3行3列//将数字按钮添加到中间面板panelcenter.add(buttonone);panelcenter.add(buttontwo);panelcenter.add(buttonthree);panelcenter.add(buttonfour);panelcenter.add(buttonfive);panelcenter.add(buttonsix);panelcenter.add(buttonseven);panelcenter.add(buttoneight);panelcenter.add(buttonnine);//为10个按钮注册事件监听器buttonone.addActionListener(h);buttontwo.addActionListener(h);buttonthree.addActionListener(h);buttonfour.addActionListener(h);buttonfive.addActionListener(h);buttonsix.addActionListener(h);buttonseven.addActionListener(h);buttoneight.addActionListener(h);buttonnine.addActionListener(h);//构造按钮“0”“.”“=”，注册事件监听器，设置1行3列的布局，添加到到西边的面板buttonzero=new JButton("0");buttondot=new JButton(".");buttonequal=new JButton("=");buttonzero.addActionListener(h);buttondot.addActionListener(h);buttonequal.addActionListener(h);panelwest.setLayout(new GridLayout(3,1));panelwest.add(buttonzero);panelwest.add(buttondot);panelwest.add(buttonequal);//构造操作按钮“+”“-”“*”“/”“sin”“>0”，其中“>0”为归零按钮buttonplus=new JButton("+");buttonminus=new JButton("-");buttonmultiple=new JButton("*");buttondevision=new JButton("/");buttonsin=new JButton("sin");buttontozero=new JButton(">0");paneleast.setLayout(new GridLayout(3,1));//设置西边的布局为3行1列//将操作按钮“+”“-”“*”“/”“sin”“>0”添加到西边的面板中paneleast.add(buttonplus);paneleast.add(buttonminus);paneleast.add(buttonmultiple);paneleast.add(buttondevision);paneleast.add(buttonsin);paneleast.add(buttontozero);//为操作按钮“+”“-”“*”“/”“sin”“>0”注册监听器buttonplus.addActionListener(h);buttonminus.addActionListener(h);buttonmultiple.addActionListener(h);buttondevision.addActionListener(h);buttonsin.addActionListener(h);buttontozero.addActionListener(h);frame.setLayout(new BorderLayout());//设置窗体为边界布局frame.add(paneleast,"East");//将东边面板paneleast添加到窗体的东边frame.add(tf,BorderLayout.NORTH); //将tf文本区域添加到窗体的北边，即顶部frame.add(panelwest,BorderLayout.WEST);//将panelwest面板添加到窗体西边frame.add(panelcenter,BorderLayout.CENTER);//将panelcenter面板添加到窗体中间frame.pack();//设置窗体大小，适合其子组件的首选大小和布局frame.setLocation(500,500);//设置窗体显示位置为（500,500）frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//设置布局窗体默认关闭方式frame.setVisible(true);//设置窗体可见}public static void main(String[] args) {new CalcultorThree();//主方法中新建对象}class Handle implements ActionListener{//实现动作监听器类int biaozhi=0;//此标志标志加减乘除操作double flag1=0,flag2=0,flag3=0;//flag1、flag2为两个操作数，flag3为结果Overridepublic void actionPerformed(ActionEvent e) { //方法重写try{//此处可能会产生异常，用try、catch捕捉异常，不用处理if(e.getSource()==buttondot){//小数点tf.setT ext("0.");}if(e.getSource()==buttontozero){//归零操作tf.setT ext("");}if(e.getSource()==buttonzero){//按键0操作tf.setT ext(tf.getT ext()+"0");flag1=Double.parseDouble(tf.getT ext());//将文本区域转换成Double类型，赋给flag1}if(e.getSource()==buttonone){//按键1操作tf.setT ext(tf.getT ext()+"1");flag1=Double.parseDouble(tf.getT ext());}else if(e.getSource()==buttontwo){//按键2操作tf.setT ext(tf.getT ext()+"2");flag1=Double.parseDouble(tf.getT ext());}else if(e.getSource()==buttonthree){//按键3操作tf.setT ext(tf.getT ext()+"3");flag1=Double.parseDouble(tf.getT ext());}else if(e.getSource()==buttonfour){//按键4操作tf.setT ext(tf.getT ext()+"4");flag1=Double.parseDouble(tf.getT ext());}else if(e.getSource()==buttonfive){//按键5操作tf.setT ext(tf.getT ext()+"5");flag1=Double.parseDouble(tf.getT ext());}else if(e.getSource()==buttonsix){//按键6操作tf.setT ext(tf.getT ext()+"6");flag1=Double.parseDouble(tf.getT ext());}else if(e.getSource()==buttonseven){//按键7操作tf.setT ext(tf.getT ext()+"7");flag1=Double.parseDouble(tf.getT ext());}else if(e.getSource()==buttoneight){//按键8操作tf.setT ext(tf.getT ext()+"8");flag1=Double.parseDouble(tf.getT ext());}else if(e.getSource()==buttonnine){//按键9操作tf.setT ext(tf.getT ext()+"9");flag1=Double.parseDouble(tf.getT ext());}if(e.getSource()==buttonplus){//加法操作tf.setT ext("");flag2=flag1;biaozhi=0;}if(e.getSource()==buttonminus){//减法操作tf.setT ext("");flag2=flag1;biaozhi=1;}if(e.getSource()==buttonmultiple){//乘法操作tf.setT ext("");flag2=flag1;biaozhi=2;}if(e.getSource()==buttondevision){//除法操作tf.setT ext("");flag2=flag1;biaozhi=3;}if(e.getSource()==buttonsin){//正弦操作flag3=Math.sin(flag1);tf.setT ext(flag3+"");}if(e.getSource()==buttonequal){//等号操作，利用biaozhi判断进行相应加减乘除操作if(biaozhi==0){flag3=flag1+flag2;}if(biaozhi==1){flag3=flag1-flag2;}if(biaozhi==2){flag3=flag1*flag2;}if(biaozhi==3){flag3=flag1/flag2;}tf.setT ext(flag3+""); }}catch(Exception ex){}}}}。
简单的java代码例子
简单的java代码例子1. 使用Java实现一个简单的计算器，可以进行加减乘除运算。
```javaimport java.util.Scanner;public class Calculator {public static void main(String[] args) {Scanner scanner = new Scanner(System.in);System.out.print("请输入第一个数：");double num1 = scanner.nextDouble();System.out.print("请输入运算符（+、-、*、/）：");String operator = scanner.next();System.out.print("请输入第二个数：");double num2 = scanner.nextDouble();double result = 0;switch (operator) {case "+":result = num1 + num2;break;case "-":result = num1 - num2;break;case "*":result = num1 * num2;break;case "/":result = num1 / num2;break;default:System.out.println("输入的运算符不正确！");break;}System.out.println("计算结果为：" + result);}}```2. 使用Java实现一个简单的猜数字游戏，随机生成一个1-100之间的整数，让用户猜，直到猜中为止。
```javaimport java.util.Random;import java.util.Scanner;public class GuessNumber {public static void main(String[] args) {Random random = new Random();int number = random.nextInt(100) + 1;Scanner scanner = new Scanner(System.in);int guess;do {System.out.print("请输入你猜的数字（1-100）：");guess = scanner.nextInt();if (guess > number) {System.out.println("猜大了！");} else if (guess < number) {System.out.println("猜小了！");}} while (guess != number);System.out.println("恭喜你，猜对了！");}}```3. 使用Java实现一个简单的学生信息管理系统，可以添加、删除、修改、查询学生信息。
java简单计算器--代码
}
}
if(act.equals("sqrt")){try{float num=(float)Math.sqrt(Float.parseFloat(t.getText()));
t.setText(String.valueOf(num));can=true;return;
JOptionPane.ERROR_MESSAGE);return;}
}
}
public float cacu(float a,char c,float b){
float sum;
switch(c){
case '+':sum=a+b;break;
case '-':sum=a-b;break;
t.setText(String.valueOf(num));can=true;return;
}catch(NumberFormatException e1){JOptionPane.showMessageDialog(null, "输入格式错误！", "警告！",
JOptionPane.ERROR_MESSAGE);return;}
p1.add(backButton);
p1.add(clearButton);
backButton.addActionListener(this);
clearButton.addActionListener(this);
p2.add(t);
p2.add(p1);
p2.setBackground(Color.black);
JAVA编写的计算器源代码
JAVA编写的计算器源代码// Calculator.javaimport javax.swing.*; // 引入swing库import java.awt.*; // 引入awt库import java.awt.event.*; // 引入awt.event库public class Calculator extends JFrame implements ActionListener//定义按钮private JButton zero;private JButton one;private JButton two;private JButton three;private JButton four;private JButton five;private JButton six;private JButton seven;private JButton eight;private JButton nine;private JButton point;private JButton equal; private JButton plus; private JButton minus; private JButton multiply; private JButton divide; private JButton backspace; private JButton ac;private JButton ce;private JButton sqrt; private JButton sqr;private JButton plus_minus; private JButton delete; private JButton sin;private JButton cos;private JButton tan;private JButton log;private JButton nfactorial; private JButton cubic; private JButton coln;private JButton factorial;//定义文本框private JTextField resulttext;// 定义boolean变量boolean clrdisp = true; // 昵称确定是否清除计算器显示boolean isCalculate = false; // 是否可以执行计算// 定义String变量，用于存储操作符String optr;//定义存储第一个操作数double num1;//初始化构造函数public Calculato//设置布局setLayout(new BorderLayout();//创建面板JPanel northPanel = new JPanel(;JPanel centerPanel = new JPanel(;JPanel southPanel = new JPanel(;//设置面板布局northPanel.setLayout(new FlowLayout(); centerPanel.setLayout(new GridLayout(4, 5)); southPanel.setLayout(new FlowLayout();//设置计算器显示resulttext = new JTextField(28); northPanel.add(resulttext);resulttext.setEditable(false);//初始化按钮zero = new JButton("0");one = new JButton("1");two = new JButton("2");three = new JButton("3");four = new JButton("4");five = new JButton("5");six = new JButton("6");seven = new JButton("7");eight = new JButton("8");nine = new JButton("9");point = new JButton(".");equal = new JButton("=");plus = new JButton("+");minus = new JButton("-"); multiply = new JButton("*"); divide = new JButton("/"); backspace = new JButton("<-"); ac = new JButton("AC");ce = new JButton("CE");sqrt = new JButton("sqrt");sqr = new JButton("sqr");plus_minus = new JButton("+/-");。
java语言写的计算器源代码附解析
//把代码改成Calc.java编译运行，完整版计算器，最下面是计算器界面import java.awt.*;import java.awt.event.*;public class Calc extends WindowAdapter implements ActionListener, MouseListener{Color cMoveOut=new Color(240 ,240 ,240);Color cMoveIn =new Color( 255,255,55);//状态变量boolean clicked=true;//判断是否单击了小数点boolean clear=true;//判断是否单击了符号位double previous;//记录第一个操作数double next;//记录第二个操作数String fuhao;//记录符号位int first=1;//标记是否开始一次新的运算过程Frame f;Panel p1,p2;TextField tf;Font fnt;Button b1,b2,b3,b4,b5,b6,b7,b8,b9,b0;Button bDiv,bSqrt,bMulti,bMinus,bPercent,bPlus,bReciprocal,bEqual,bDot,bNegative,bBack;Button bPingFang , bDaoShu , bSin, bCos ,bTan;Button bC;GridLayout p2Layout;public void display(){f=new Frame("计算器");f.setSize(280,213);f.setLocation(200,200);f.setBackground(Color.LIGHT_GRAY);f.setResizable(false);p1=new Panel(new FlowLayout());tf=new TextField(35);tf.setText("0.");tf.setEditable(false);p1.add(tf);f.add(p1,BorderLayout.NORTH);p2Layout=new GridLayout(5,5,5,4);p2=new Panel(p2Layout);f.add(p2,BorderLayout.CENTER);fnt=new Font("Serief",Font.BOLD,20);b1=new Button("1");b1.setFont(fnt);b2=new Button("2");b2.setFont(fnt);b3=new Button("3");b3.setFont(fnt);b4=new Button("4");b4.setFont(fnt);b5=new Button("5");b5.setFont(fnt);b6=new Button("6");b6.setFont(fnt);b7=new Button("7");b7.setFont(fnt);b8=new Button("8");b8.setFont(fnt);b7.setFont(fnt);b9=new Button("9");b9.setFont(fnt);b0=new Button("0");b0.setFont(fnt);b9.setFont(fnt);bPingFang=new Button("^2"); bPingFang.setFont(fnt); bDaoShu=new Button("1/X"); bDaoShu.setFont(fnt);bSin=new Button("sin");bSin.setFont(fnt);bCos=new Button("cos"); bCos.setFont(fnt);bTan=new Button("tan"); bTan.setFont(fnt);b1.addActionListener(this);b2.addActionListener(this);b3.addActionListener(this);b4.addActionListener(this);b5.addActionListener(this);b6.addActionListener(this);b7.addActionListener(this);b8.addActionListener(this);b9.addActionListener(this);b0.addActionListener(this); bBack=new Button("Back");//退格bBack.setFont(fnt);bC=new Button("C");//清空bC.setFont(fnt);bDiv=new Button("/");bDiv.setFont(fnt);bSqrt=new Button("sqrt"); bSqrt.setFont(fnt);bMulti=new Button("*"); bMulti.setFont(fnt);bMinus=new Button("-"); bMinus.setFont(fnt);bPercent=new Button("%"); bPercent.setFont(fnt);bPlus=new Button("+"); bPlus.setFont(fnt);bEqual=new Button("="); bEqual.setFont(fnt);bDot=new Button(".");bDot.setFont(fnt);bNegative=new Button("+/-"); bNegative.setFont(fnt); bBack.addActionListener(this);bC.addActionListener(this); bDiv.addActionListener(this); bSqrt.addActionListener(this); bPingFang.addActionListener(this); bPercent.addActionListener(this); bDaoShu.addActionListener(this); bMulti.addActionListener(this); bPlus.addActionListener(this); bMinus.addActionListener(this); bMulti.addActionListener(this); bDiv.addActionListener(this); bSin.addActionListener(this); bCos.addActionListener(this); bTan.addActionListener(this); bEqual.addActionListener(this); bDot.addActionListener(this); bNegative.addActionListener(this); bSqrt.addMouseListener(this); bPingFang.addMouseListener(this); bPercent.addMouseListener(this); bC.addMouseListener(this); bBack.addMouseListener(this);b7.addMouseListener(this);b8.addMouseListener(this);b9.addMouseListener(this); bDiv.addMouseListener(this); bDaoShu.addMouseListener(this); b4.addMouseListener(this);b5.addMouseListener(this);b6.addMouseListener(this); bMulti.addMouseListener(this); bSin.addMouseListener(this);b1.addMouseListener(this);b2.addMouseListener(this);b3.addMouseListener(this); bMinus.addMouseListener(this); bCos.addMouseListener(this);b0.addMouseListener(this); bDot.addMouseListener(this); bEqual.addMouseListener(this); bPlus.addMouseListener(this); bTan.addMouseListener(this);p2.add(bSqrt);p2.add(bPingFang);p2.add(bPercent);p2.add(bC);p2.add(bBack);p2.add(b7);p2.add(b8);p2.add(b9);p2.add(bDiv);p2.add(bDaoShu);p2.add(b4);p2.add(b5);p2.add(b6);p2.add(bMulti);p2.add(bSin);p2.add(b1);p2.add(b2);p2.add(b3);p2.add(bMinus);p2.add(bCos);p2.add(b0);p2.add(bDot);p2.add(bEqual);p2.add(bPlus);p2.add(bTan);f.setV isible(true);f.addWindowListener(this);}public void actionPerformed(ActionEvent e) {if (first ==1)tf.setText("");first=0;Object temp=e.getSource();//退格if (temp== bBack){String s=tf.getText();tf.setText("");for (int i=0;i<s.length()-1;i++){char a=s.charAt(i);tf.setText(tf.getText()+a);}}//清零if (temp==bC){tf.setText("0.");clear=true;first=1;}if (temp==b0){//判断是否单击了符号位if (clear==false)tf.setText("");tf.setText(tf.getText()+"0");}if (temp==b1){if (clear==false)tf.setText("");tf.setText(tf.getText()+"1");clear=true;}if (temp==b2){if (clear==false)tf.setText("");tf.setText(tf.getText()+"2");clear=true;}if (temp==b3){if (clear==false)tf.setText("");tf.setText(tf.getText()+"3");clear=true;}if (temp==b4){if (clear==false)tf.setText("");tf.setText(tf.getText()+"4");clear=true;}if (temp==b5){if (clear==false)tf.setText("");tf.setText(tf.getText()+"5");clear=true;}if (temp==b6){if (clear==false)tf.setText("");tf.setText(tf.getText()+"6");clear=true;}if (temp==b7){if (clear==false)tf.setText("");tf.setText(tf.getText()+"7");clear=true;}if (temp==b8){if (clear==false)tf.setText("");tf.setText(tf.getText()+"8");clear=true;}if (temp==b9){if (clear==false)tf.setText("");tf.setText(tf.getText()+"9");clear=true;}//判断是否含有小数点if (temp == bDot){clicked=true;for (int i=0;i<tf.getText().length();i++)if ('.'==tf.getText().charAt(i)){clicked = false;break;}if (clicked == true){tf.setText(tf.getText()+".");clear=true;}}//bSqrtif(temp == bSqrt){tf.setText( Math.sqrt( Double.parseDouble(tf.getText())) + "" );clear=false;}//bPingFangif(temp == bPingFang ){tf.setText( Math.pow( Double.parseDouble(tf.getText() ), 2 ) + "" );clear=false;}//倒数if(temp == bDaoShu){tf.setText( 1 / Double.parseDouble(tf.getText()) + "" );clear =false;}//Sinif(temp == bSin){tf.setText( Math.sin( Math.toRadians( Double.parseDouble( tf.getText() ) ) ) + "" );clear =false;}//Cosif(temp == bCos){tf.setText( Math.cos( Math.toRadians( Double.parseDouble( tf.getText() ) ) ) + "" );clear =false;}//tanif(temp == bTan){tf.setText( Math.tan( Math.toRadians( Double.parseDouble( tf.getText() ) ) ) + "");clear =false;}//加法运算if (temp==bPlus){previous=Double.parseDouble(tf.getText());fuhao="+";clear=false;//System.out.print("+");}//减法运算if (temp == bMinus){previous=Double.parseDouble(tf.getText());fuhao="-";clear=false;}//乘法运算if (temp == bMulti){previous=Double.parseDouble(tf.getText());fuhao="*";clear=false;}//除法运算bDivif (temp == bDiv){previous=Double.parseDouble(tf.getText());fuhao="/";clear=false;}//求余数if(temp == bPercent){previous=Double.parseDouble( tf.getText());fuhao="%";clear=false;}//等于if (temp==bEqual){try{next = Double.parseDouble(tf.getText());tf.setText("");if (fuhao =="+")tf.setText(previous + next +"");if(fuhao == "-")tf.setText(previous - next +"");if(fuhao == "*")tf.setText(previous * next +"");if(fuhao == "/")tf.setText(previous / next +"");if(fuhao == "%")tf.setText(previous % next +"");clear=false;}catch(Exception ex){tf.setText("请检查输入的数据：" + ex.getMessage()) ;clear=false;}}}public void mouseEntered(MouseEvent e){Object temp= e.getSource();if(temp==bPingFang){//System.out.println( bBack.getBackground() );bPingFang.setBackground(cMoveIn);}if(temp==bSqrt){bSqrt.setBackground(cMoveIn);}if(temp==bPercent){bPercent.setBackground(cMoveIn);}if(temp==bC){bC.setBackground(cMoveIn);}if(temp==bBack){bBack.setBackground(cMoveIn);}if(temp==b7){b7.setBackground(cMoveIn);}if(temp==b8){b8.setBackground(cMoveIn);}if(temp==b9){b9.setBackground(cMoveIn);}if(temp==bDiv){bDiv.setBackground(cMoveIn);}if(temp==bDaoShu){bDaoShu.setBackground(cMoveIn); }if(temp==b4){b4.setBackground(cMoveIn);}if(temp==b5){b5.setBackground(cMoveIn);}if(temp==b6){b6.setBackground(cMoveIn);}if(temp==bMulti){bMulti.setBackground(cMoveIn); }if(temp==bSin){bSin.setBackground(cMoveIn);}if(temp==b1){b1.setBackground(cMoveIn);}if(temp==b2){b2.setBackground(cMoveIn);}if(temp==b3){b3.setBackground(cMoveIn);}if(temp==bMinus){bMinus.setBackground(cMoveIn); }if(temp==bCos){bCos.setBackground(cMoveIn);}if(temp==b0){b0.setBackground(cMoveIn);}if(temp==bDot){bDot.setBackground(cMoveIn);}if(temp==bEqual){bEqual.setBackground(cMoveIn);}if(temp==bPlus){bPlus.setBackground(cMoveIn);}if(temp==bTan){bTan.setBackground(cMoveIn);}}public void mouseExited(MouseEvent e) {Object temp= e.getSource();if(temp==bPingFang){//System.out.println( bBack.getBackground() );bPingFang.setBackground(cMoveOut);}if(temp==bSqrt){bSqrt.setBackground(cMoveOut);}if(temp==bPercent){bPercent.setBackground(cMoveOut);}if(temp==bC){bC.setBackground(cMoveOut);}if(temp==bBack){bBack.setBackground(cMoveOut);}if(temp==b7){b7.setBackground(cMoveOut);}if(temp==b8){b8.setBackground(cMoveOut);}if(temp==b9){b9.setBackground(cMoveOut);}if(temp==bDiv){bDiv.setBackground(cMoveOut);}if(temp==bDaoShu){bDaoShu.setBackground(cMoveOut); }if(temp==b4){b4.setBackground(cMoveOut);}if(temp==b5){b5.setBackground(cMoveOut);}if(temp==b6){b6.setBackground(cMoveOut);}if(temp==bMulti){bMulti.setBackground(cMoveOut); }if(temp==bSin){bSin.setBackground(cMoveOut);}if(temp==b1){b1.setBackground(cMoveOut);}if(temp==b2){b2.setBackground(cMoveOut);}if(temp==b3){b3.setBackground(cMoveOut);}if(temp==bMinus){bMinus.setBackground(cMoveOut); }if(temp==bCos){bCos.setBackground(cMoveOut);}if(temp==b0){b0.setBackground(cMoveOut);}if(temp==bDot){bDot.setBackground(cMoveOut);}if(temp==bEqual){bEqual.setBackground(cMoveOut);}if(temp==bPlus){bPlus.setBackground(cMoveOut);}if(temp==bTan){bTan.setBackground(cMoveOut);}}public static void main(String args[]){Calc frame=new Calc();frame.display();}public void windowClosing(WindowEvent e){System.exit(0);}public void mouseClicked(MouseEvent arg0) {}public void mousePressed(MouseEvent arg0) {}public void mouseReleased(MouseEvent arg0) { }}。
超级简单明了的JAVA计算器代码
package caculator;import java.awt.Color;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.*;public class caculator extends JFrame implements ActionListener { double sum=0;static double getValue;static int action ;int i=0,j=0,p=0,l;double par1;JButton Jk=new JButton("k");JButton J1 = new JButton("1");JButton J2 = new JButton("2");JButton J3 = new JButton("3");JButton J4 = new JButton("4");JButton J5 = new JButton("5");JButton J6 = new JButton("6");JButton J7 = new JButton("7");JButton J8 = new JButton("8");JButton J9 = new JButton("9");JButton J0 = new JButton("0");JButton Je = new JButton("=");JButton Ja = new JButton("+");JButton Jr = new JButton("-");JButton Jm = new JButton("*");JButton Jd = new JButton("/");JButton Jc = new JButton("清除");JButton Jpt = new JButton(".");JTextArea show = new JTextArea("");caculator(){super("caculator");setLocation(200,200);setSize(300,350);setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setVisible(true);JPanel jp = new JPanel();jp.setLayout(null);jp.add(J1);jp.add(J2);jp.add(J3);jp.add(J4);jp.add(J5);jp.add(J6);jp.add(J7);jp.add(J8);jp.add(J9);jp.add(J0);jp.add(Je);jp.add(Ja);jp.add(Jr);jp.add(Jm);jp.add(Jd);jp.add(Jc);jp.add(Je);jp.add(Jpt);J9.setBackground(Color.pink); J8.setBackground(Color.pink); J7.setBackground(Color.pink); J6.setBackground(Color.pink); J5.setBackground(Color.pink); J4.setBackground(Color.pink); J3.setBackground(Color.pink); J2.setBackground(Color.pink); J1.setBackground(Color.pink); J0.setBackground(Color.pink);Je.setBackground(Color.pink);Ja.setBackground(Color.pink); Jr.setBackground(Color.pink); Jm.setBackground(Color.pink); Jd.setBackground(Color.pink); Jc.setBackground(Color.pink); Jpt.setBackground(Color.pink);J7.setBounds(10,70,60,50);J8.setBounds(75,70,60,50);J9.setBounds(140,70,60,50); J4.setBounds(10,125,60,50); J5.setBounds(75,125,60,50); J6.setBounds(140,125,60,50); J1.setBounds(10,180,60,50); J2.setBounds(75,180,60,50); J3.setBounds(140,180,60,50); J0.setBounds(10,235,60,50); Je.setBounds(75,235,60,50); Jpt.setBounds(140,235,60,50);Jd.setBounds(205,70,60,50); Jm.setBounds(205,125,60,50); Jr.setBounds(205,180,60,50); Ja.setBounds(205,235,60,50); Jc.setBounds(205,10,60,50);J1.addActionListener(this);J2.addActionListener(this);J3.addActionListener(this);J4.addActionListener(this);J5.addActionListener(this);J6.addActionListener(this);J7.addActionListener(this);J8.addActionListener(this);J9.addActionListener(this);J0.addActionListener(this);Ja.addActionListener(this);Jr.addActionListener(this);Jm.addActionListener(this);Je.addActionListener(this);Jc.addActionListener(this);Jpt.addActionListener(this);jp.add(show);show.setBackground(Color.pink);show.setBounds(10,10,180,50);setContentPane(jp);}@Overridepublic void actionPerformed(ActionEvent e) { if(e.getSource()==J0){show.setText("0"); }if(e.getSource()==J1){show.setText("1");}if(e.getSource()==J2){show.setText("2");}if(e.getSource()==J3){show.setText("3");}if(e.getSource()==J4){show.setText("4");}if(e.getSource()==J5){show.setText("5");}if(e.getSource()==J6){show.setText("6");}if(e.getSource()==J7){show.setText("7");}if(e.getSource()==J8){show.setText("8");}if(e.getSource()==J9){show.setText("9");}par1=Double.parseDouble(show.getText()); if(e.getSource()==Ja){show.setText("");if(j==0){sum=par1;}else if(action==1){sum+=par1;}setsum();j++;p=0;i=0;action = 1;} if(e.getSource()==Jr){show.setText("");if(j==0){sum=par1;}else if(action==2){sum-=par1;}setsum();j++;p=0;i=0;action = 2;}if(e.getSource()==Jm){show.setText(""); if(j==0){sum=par1;}else if(action==3){sum*=par1;}setsum();j++;p=0;i=0;action = 3;}if(e.getSource()==Jd){show.setText(""); if(j==0){sum=par1;}else if(action==4){sum/=par1;}setsum();j++;p=0;i=0;action = 4;if(e.getSource()==Jc){clear();}if(e.getSource()==Jpt){show.append(".");}if(e.getSource()==Je){switch(action){case 1:show.setText(String.valueOf(sum+=par1)); break;case 2:show.setText(String.valueOf(sum-=par1)); break;case 3:show.setText(String.valueOf(sum*=par1)); break;case 4:show.setText(String.valueOf(sum/=par1)); break;}i=0;j=0;action=0;}}private void setsum() {show.setText(String.valueOf(sum));String s=show.getText();}void clear(){i=0;j=0;p=0;sum=0;action=0;show.setText("0"); }// TODO Auto-generated method stubpublic static void main(String args[]){caculator ct=new caculator();}}。
计算器(JAVA)源代码
//定义计算的类import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.JTextField;public class Caculate implements ActionListener { //设置属性private String data;private JTextField text;private String result = "0";private boolean start_new = false;private double last_value = 0;private String ope = "";private double value = 0;public String getResult (){return result;}//定义一个构造方法public Caculate(JTextField text){this.text = text;}@Override//按钮事件处理public void actionPerformed(ActionEvent cal) { // TODO Auto-generated method stubdata = cal.getActionCommand();data = data.trim();if("0123456789".indexOf(data) != -1){numButton(data);}else if (".".indexOf(data) != -1){dotButton(data);}else if ("+-*/".indexOf(data) != -1){operateButton(data);}else if ("=".indexOf(data)!=-1){equalButton();}//System.out.println(data);System.out.println(result);text.setText(result);}//计算程序private void numButton(String da){if(!start_new){result = result + da;}else{result = da;}while (result.startsWith("0")&&!result.startsWith("0.")&&result.length()>0){ result = result.substring(1);}start_new = false;}private void dotButton(String da){if(da.indexOf(".")!= -1){result = result + da;}}private void operateButton(String da){if(result.length()>0){last_value = Double.parseDouble(result);ope = da;start_new = true;}}private void equalButton(){value = Double.parseDouble(result);if(ope.equals("+")){result = String.valueOf(last_value + value);}else if(ope.equals("-")){result = String.valueOf(last_value - value);}else if(ope.equals("*")){result = String.valueOf(last_value * value);}else if(ope.equals("/")){if(value == 0){result = "ERROR";}else{result = String.valueOf(last_value / value);}}// 去掉结尾的“.0000...”if (result.matches(".+\\.0+")) {result = result.substring(0, stIndexOf("."));}// 设置状态start_new = true;ope = "";}}import javax.swing.JTextField;public class Culator {private static final String String = null;JTextField op;private String re;/*** @param args*/public static void main(String[] args) {Culator cul = new Culator();cul.init();// TODO Auto-generated method stub}public void init(){javax.swing.JFrame frame = new javax.swing.JFrame(); frame.setTitle("计算器");java.awt.FlowLayout f1= new java.awt.FlowLayout();frame.setLayout(f1);javax.swing.JMenuBar cai = createMB();frame.setJMenuBar(cai);javax.swing.JButton mc = new javax.swing.JButton("MC");op= new javax.swing.JTextField("0",25);//设置数字从右边开始显示op.setHorizontalAlignment(JTextField.RIGHT);//设置按钮javax.swing.JButton mr = new javax.swing.JButton("MR"); javax.swing.JButton ms = new javax.swing.JButton("MS"); javax.swing.JButton mp = new javax.swing.JButton("M+"); javax.swing.JButton mm = new javax.swing.JButton("M-"); javax.swing.JButton delete = new javax.swing.JButton(" ←"); javax.swing.JButton ce = new javax.swing.JButton("CE "); javax.swing.JButton c = new javax.swing.JButton(" C "); javax.swing.JButton pm = new javax.swing.JButton(" ± "); javax.swing.JButton r = new javax.swing.JButton(" √"); javax.swing.JButton seven = new javax.swing.JButton(" 7 "); javax.swing.JButton eight = new javax.swing.JButton(" 8 "); javax.swing.JButton nine = new javax.swing.JButton(" 9 ");javax.swing.JButton under = new javax.swing.JButton(" / ");javax.swing.JButton percent = new javax.swing.JButton(" % ");javax.swing.JButton four = new javax.swing.JButton(" 4 ");javax.swing.JButton five = new javax.swing.JButton(" 5 ");javax.swing.JButton six = new javax.swing.JButton(" 6 ");javax.swing.JButton and = new javax.swing.JButton(" * ");javax.swing.JButton ds = new javax.swing.JButton("1/x");javax.swing.JButton one = new javax.swing.JButton(" 1 ");javax.swing.JButton two = new javax.swing.JButton(" 2 ");javax.swing.JButton three = new javax.swing.JButton(" 3 ");javax.swing.JButton m = new javax.swing.JButton(" - ");javax.swing.JButton equal = new javax.swing.JButton(" = ");javax.swing.JButton zero = new javax.swing.JButton(" 0 ");javax.swing.JButton dot = new javax.swing.JButton(" . ");javax.swing.JButton plus = new javax.swing.JButton(" + ");//添加按钮frame.add(op);frame.add(mc);frame.add(mr);frame.add(ms);frame.add(mp);frame.add(mm);frame.add(delete);frame.add(ce);frame.add(c);frame.add(pm);frame.add(r);frame.add(seven);frame.add(eight);frame.add(nine);frame.add(under);frame.add(percent);frame.add(four);frame.add(five);frame.add(six);frame.add(and);frame.add(ds);frame.add(one);frame.add(two);frame.add(three);frame.add(m);frame.add(equal);frame.add(zero);frame.add(dot);frame.add(plus);frame.setSize(290,300);//实例化一个Caculate类Caculate cal = new Caculate(op);//增加监听op.addActionListener(cal);mc.addActionListener(cal);mr.addActionListener(cal);ms.addActionListener(cal);mp.addActionListener(cal);mm.addActionListener(cal);delete.addActionListener(cal);ce.addActionListener(cal);c.addActionListener(cal);pm.addActionListener(cal);r.addActionListener(cal);seven.addActionListener(cal);eight.addActionListener(cal);nine.addActionListener(cal);under.addActionListener(cal); percent.addActionListener(cal);four.addActionListener(cal);five.addActionListener(cal);six.addActionListener(cal);and.addActionListener(cal);ds.addActionListener(cal);one.addActionListener(cal);two.addActionListener(cal);three.addActionListener(cal);m.addActionListener(cal);equal.addActionListener(cal);zero.addActionListener(cal);dot.addActionListener(cal);plus.addActionListener(cal);frame.setDefaultCloseOperation(3); frame.setResizable(false);frame.setVisible(true);}//创建一个设置TextField窗口容的函数//public void setOp(String re){// op.setText(re);//}//创建一个常带有菜单的菜单条，就加到JFrame上显示private javax.swing.JMenuBar createMB(){//创建菜单条javax.swing.JMenuBar mb = new javax.swing.JMenuBar();//创建查看菜单javax.swing.JMenu view = new javax.swing.JMenu("查看(V)");//创建菜单项javax.swing.JMenuItem biaozhun = new javax.swing.JMenuItem("标准型"); javax.swing.JMenuItem kexue = new javax.swing.JMenuItem("科学型"); javax.swing.JMenuItem chengxu = new javax.swing.JMenuItem("程序员"); javax.swing.JMenuItem tongji = new javax.swing.JMenuItem("统计信息"); javax.swing.JMenuItem history = new javax.swing.JMenuItem("历史");//将菜单项添加到菜单上view.add(biaozhun);view.add(kexue);view.add(chengxu);view.add(tongji);view.add(history);//创建编辑菜单javax.swing.JMenu operation = new javax.swing.JMenu("编辑(O)");//创建菜单项javax.swing.JMenuItem copy = new javax.swing.JMenuItem("复制"); javax.swing.JMenuItem paste = new javax.swing.JMenuItem("黏贴"); javax.swing.JMenuItem hr = new javax.swing.JMenuItem("历史记录");//将菜单项添加到菜单上operation.add(copy);operation.add(paste);operation.add(hr);//创建帮助菜单javax.swing.JMenu help = new javax.swing.JMenu("帮助(H)");//创建帮助菜单项javax.swing.JMenuItem vh = new javax.swing.JMenuItem("查看帮助"); javax.swing.JMenuItem about = new javax.swing.JMenuItem("关于计算器"); //将菜单项添加到菜单上help.add(vh);help.add(about);//加上一个分隔条help.addSeparator();//将菜单添加到菜单条上mb.add(view);mb.add(operation);mb.add(help);return mb;} }。
JAVA计算器源代码
计算器源代码一、计算器源代码文件名：computer1.javaimport java.awt.*;import java.awt.event.*;public class computer1 extends Frame implements ActionListener{//声明窗口类并实现动作事件接口。
Button n0,n1,n2,n3,n4,n5,n6,n7,n8,n9;//声明数字按钮Button op,os,om,od,oe,oc;//声明操作按钮TextField tfd;//声明文本框String flg,rslt;//声明标志串、结果串Panel p1,p2,p3;//声明面板int i1,i2;float flt;computer1(){super("加减乘除计算器");n0 = new Button("0");//实现各按钮n1 = new Button("1");n2 = new Button("2");n3 = new Button("3");n4 = new Button("4");n5 = new Button("5");n6 = new Button("6");n7 = new Button("7");n8 = new Button("8");n9 = new Button("9");op = new Button("加");os = new Button("减");om = new Button("乘");od = new Button("除");oe = new Button("=");oc = new Button("c");tfd = new TextField(20);//实现文本框p1=new Panel();//实现各面板p2=new Panel();p3=new Panel();setLayout(new FlowLayout());//布局设计，用于安排按钮位置p1.add(n0);//将各数字按钮放入p1中p1.add(n1);p1.add(n2);p1.add(n3);p1.add(n4);p1.add(n5);p1.add(n6);p1.add(n7);p1.add(n8);p1.add(n9);p2.add(op);//将各操作按钮放入p2、p3中p2.add(os);p2.add(om);p2.add(od);p3.add(oe);p3.add(oc);setLayout(new BorderLayout());//布局设计，用于安排面板位置add("North",tfd);add("West",p1);add("Center",p2);add("East",p3);n0.addActionListener(this);//注册监听器到各按钮n1.addActionListener(this);n2.addActionListener(this);n3.addActionListener(this);n4.addActionListener(this);n5.addActionListener(this);n6.addActionListener(this);n7.addActionListener(this);n8.addActionListener(this);n9.addActionListener(this);op.addActionListener(this);os.addActionListener(this);om.addActionListener(this);od.addActionListener(this);oe.addActionListener(this);oc.addActionListener(this);addWindowListener(new closeWin());setSize(600,100);//确定窗口的尺寸setVisible(true);}public static void main (String args[]){new computer1();}public void actionPerformed(ActionEvent e){//处理鼠标事件的方法try{//异常处理if(e.getSource()==n0)//按数字键时tfd.setText(tfd.getText()+"0");if(e.getSource()==n1)tfd.setText(tfd.getText()+"1");if(e.getSource()==n2)tfd.setText(tfd.getText()+"2");if(e.getSource()==n3)tfd.setText(tfd.getText()+"3");if(e.getSource()==n4)tfd.setText(tfd.getText()+"4");if(e.getSource()==n5)tfd.setText(tfd.getText()+"5");if(e.getSource()==n6)tfd.setText(tfd.getText()+"6");if(e.getSource()==n7)tfd.setText(tfd.getText()+"7");if(e.getSource()==n8)tfd.setText(tfd.getText()+"8");if(e.getSource()==n9)tfd.setText(tfd.getText()+"9");if(e.getSource()==op){//按加号键时i1 = Integer.parseInt(tfd.getText());tfd.setText("");flg = "op";}if(e.getSource()==os){//按减号键时i1 = Integer.parseInt(tfd.getText());tfd.setText("");flg = "os";}if(e.getSource()==om){//按乘号键时i1 = Integer.parseInt(tfd.getText());tfd.setText("");flg = "om";}if(e.getSource()==od){//按除号键时i1 = Integer.parseInt(tfd.getText());tfd.setText("");flg = "od";}if(e.getSource()==oe){//按等号键时i2 = Integer.parseInt(tfd.getText());if(flg=="op"){rslt=Integer.toString(i1+i2);}if(flg=="os"){rslt=Integer.toString(i1-i2);}if(flg=="om"){rslt=Integer.toString(i1*i2);}if(flg=="od"){//除法需做小数处理flt=((float)i1)/((float)i2);rslt=Float.toString(flt);}tfd.setText(rslt);}if(e.getSource()==oc){//按清除键时tfd.setText("");flg = "";}}catch(Exception ex){}//扑捉到异常，但不进行处理}}class closeWin extends WindowAdapter{ //关闭窗口public void windowClosing(WindowEvent e){Frame frm=(Frame)(e.getSource());frm.dispose();System.exit(0);}}二、计算器界面三、修改后计算器界面。
简单的计算器源代码
//计算器,已经编译通过import java.awt.*;import java.awt.event.*;import javax.swing.*;public class testZ extends JFrame implements ActionListener{private JPanel jPanel1,jPanel2;private JTextField resultField;private JButton s1,s2,s3,s4,s5,s6,s7,s8,s9,s0,b1,b2,b3,b4,f1,f2; private boolean end,add,sub,mul,div;private String str;private double num1,num2;public testZ(){super("计算器");setSize(300,240);Container con=getContentPane();con.setLayout(new BorderLayout());jPanel1=new JPanel();jPanel1.setLayout(new GridLayout(1,1));jPanel2=new JPanel();jPanel2.setLayout(new GridLayout(4,4));resultField=new JTextField("0");jPanel1.add(resultField);con.add(jPanel1,BorderLayout.NORTH);s1=new JButton(" 1 "); s1.addActionListener(this);s2=new JButton(" 2 "); s2.addActionListener(this);s3=new JButton(" 3 "); s3.addActionListener(this);s4=new JButton(" 4 "); s4.addActionListener(this);s5=new JButton(" 5 "); s5.addActionListener(this);s6=new JButton(" 6 "); s6.addActionListener(this);s7=new JButton(" 7 "); s7.addActionListener(this);s8=new JButton(" 8 "); s8.addActionListener(this);s9=new JButton(" 9 "); s9.addActionListener(this);s0=new JButton(" 0 "); s0.addActionListener(this);b1=new JButton(" + "); b1.addActionListener(this);b2=new JButton(" - "); b2.addActionListener(this);b3=new JButton(" * "); b3.addActionListener(this);b4=new JButton(" / "); b4.addActionListener(this);f1=new JButton(" . "); f1.addActionListener(this);f2=new JButton(" = "); f2.addActionListener(this);jPanel2.add(s1);jPanel2.add(s2);jPanel2.add(s3);jPanel2.add(b1);jPanel2.add(s4);jPanel2.add(s5);jPanel2.add(s6);jPanel2.add(b2);jPanel2.add(s7);jPanel2.add(s8);jPanel2.add(s9);jPanel2.add(b3);jPanel2.add(s0);jPanel2.add(f1);jPanel2.add(f2);jPanel2.add(b4);con.add(jPanel2,BorderLayout.CENTER);}public void num(int i){String s = null;s=String.valueOf(i);if(end){//如果数字输入结束，则将文本框置零，重新输入resultField.setText("0");end=false;}if((resultField.getText()).equals("0")){//如果文本框的内容为零，则覆盖文本框的内容resultField.setText(s);}else{//如果文本框的内容不为零，则在内容后面添加数字str = resultField.getText() + s;resultField.setText(str);}}public void actionPerformed(ActionEvent e){ //数字事件 if(e.getSource()==s1)num(1);else if(e.getSource()==s2)num(2);else if(e.getSource()==s3)num(3);else if(e.getSource()==s4)num(4);else if(e.getSource()==s5)num(5);else if(e.getSource()==s6)num(6);else if(e.getSource()==s7)num(7);else if(e.getSource()==s8)num(8);else if(e.getSource()==s9)num(9);else if(e.getSource()==s0)num(0);//符号事件else if(e.getSource()==b1)sign(1);else if(e.getSource()==b2)sign(2);else if(e.getSource()==b3)sign(3);else if(e.getSource()==b4)sign(4);//等号else if(e.getSource()==f1){str=resultField.getText();if(str.indexOf(".")<=1){str+=".";resultField.setText(str);}}else if(e.getSource()==f2){num2=Double.parseDouble(resultField.getText());if(add){num1=num1 + num2;}else if(sub){num1=num1 - num2;}else if(mul){num1=num1 * num2;}else if(div){num1=num1 / num2;}resultField.setText(String.valueOf(num1));end=true;}}public void sign(int s){if(s==1){add=true;sub=false;mul=false;div=false;}else if(s==2){add=false;sub=true;mul=false;div=false;}else if(s==3){add=false;sub=false;mul=true;div=false;}else if(s==4){add=false;sub=false;mul=false;div=true;}num1=Double.parseDouble(resultField.getText()); end=true;}public static void main(String[] args){testZ th1=new testZ();th1.show();}}。
计算器设计java版的源代码
这是用java编写的计算器的源代码，界面粗糙，在elipse中运行通过，就两个类：第一个类frame ，代码如下package jisuanqi;import java.awt.Color;import java.awt.Container;import java.awt.GridBagConstraints;import java.awt.GridBagLayout;import java.awt.Point;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JTextField;public class frame {static double aa=0;//寄存器static int bb=0;//判断是否为连续输入运算符static int cc=0;static char dd='d';//记录前一次运算符的值public static void main(String args[]){JFrame fm=new JFrame("计算器");fm.setSize(220,180);//fm.setMaximumSize(null);fm.setLocation(new Point(200,100));fm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);Container container=fm.getContentPane();GridBagLayout layout=new GridBagLayout();container.setLayout(layout);GridBagConstraints gg=new GridBagConstraints();JTextField txt=new JTextField("0");txt.setHorizontalAlignment(JTextField.RIGHT);txt.setEditable(false);txt.setBackground(Color.white);gg.gridx=0;gg.gridy=0;gg.fill=GridBagConstraints.HORIZONTAL;gg.gridheight=1;gg.gridwidth=15;container.add(txt,gg);gg.fill=GridBagConstraints.NONE;gg.gridy=1;gg.gridwidth=2;JButton btn7=new JButton("7");Mylistener mylistener7 =new Mylistener(btn7.getText(),txt);btn7.addActionListener(mylistener7);container.add(btn7,gg);JButton btn8=new JButton("8");Mylistener mylistener8 =new Mylistener(btn8.getText(),txt); btn8.addActionListener(mylistener8);gg.gridx=2;container.add(btn8,gg);JButton btn9=new JButton("9");Mylistener mylistener9 =new Mylistener(btn9.getText(),txt); btn9.addActionListener(mylistener9);gg.gridx=4;container.add(btn9,gg);JButton btnc=new JButton("/");gg.gridx=6;container.add(btnc,gg);Mylistener mylistenerc =new Mylistener(btnc.getText(),txt); btnc.addActionListener(mylistenerc);JButton btnb=new JButton("B");gg.gridx=8;container.add(btnb,gg);Mylistener mylistenerb =new Mylistener(btnb.getText(),txt); btnb.addActionListener(mylistenerb);gg.gridx=0;gg.gridy=2;JButton btn4=new JButton("4");Mylistener mylistener4 =new Mylistener(btn4.getText(),txt); btn4.addActionListener(mylistener4);container.add(btn4,gg);JButton btn5=new JButton("5");gg.gridx=2;Mylistener mylistener5 =new Mylistener(btn5.getText(),txt); btn5.addActionListener(mylistener5);container.add(btn5,gg);JButton btn6=new JButton("6");gg.gridx=4;Mylistener mylistener6 =new Mylistener(btn6.getText(),txt); btn6.addActionListener(mylistener6);container.add(btn6,gg);JButton btncf=new JButton("*");gg.gridx=6;Mylistener mylistenercf =new Mylistener(btncf.getText(),txt); btncf.addActionListener(mylistenercf);container.add(btncf,gg);gg.gridx=8;Mylistener mylistenerce =new Mylistener(btnce.getText(),txt); btnce.addActionListener(mylistenerce);container.add(btnce,gg);gg.gridx=0;gg.gridy=3;JButton btn1=new JButton("1");container.add(btn1,gg);Mylistener mylistener1 =new Mylistener(btn1.getText(),txt); btn1.addActionListener(mylistener1);JButton btn2=new JButton("2");gg.gridx=2;Mylistener mylistener2 =new Mylistener(btn2.getText(),txt); btn2.addActionListener(mylistener2);container.add(btn2,gg);JButton btn3=new JButton("3");gg.gridx=4;Mylistener mylistener3 =new Mylistener(btn3.getText(),txt); btn3.addActionListener(mylistener3);container.add(btn3,gg);JButton btnjf=new JButton("-");gg.gridx=6;Mylistener mylistenerjf =new Mylistener(btnjf.getText(),txt); btnjf.addActionListener(mylistenerjf);container.add(btnjf,gg);JButton btncc=new JButton("C");gg.gridx=8;Mylistener mylistenercc =new Mylistener(btncc.getText(),txt); btncc.addActionListener(mylistenercc);container.add(btncc,gg);gg.gridx=0;gg.gridy=4;JButton btn0=new JButton("0");container.add(btn0,gg);Mylistener mylistenero =new Mylistener(btn0.getText(),txt); btn0.addActionListener(mylistenero);JButton btnqf=new JButton("+/-");gg.gridx=2;Mylistener mylistenerqf =new Mylistener(btnqf.getText(),txt); btnqf.addActionListener(mylistenerqf);container.add(btnqf,gg);gg.gridx=4;Mylistener mylistenerd =new Mylistener(btnd.getText(),txt);btnd.addActionListener(mylistenerd);container.add(btnd,gg);JButton btnjiaf=new JButton("+");gg.gridx=6;Mylistener mylistenerfff =new Mylistener(btnjiaf.getText(),txt);btnjiaf.addActionListener(mylistenerfff);container.add(btnjiaf,gg);JButton btndy=new JButton("=");gg.gridx=8;container.add(btndy,gg);Mylistener mylistenerdy =new Mylistener(btndy.getText(),txt);btndy.addActionListener(mylistenerdy);fm.setVisible(true);}}第二个类Mylistener 代码如下:package jisuanqi;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.JTextField;public class Mylistener implements ActionListener {private String a;//button上的值private JTextField txt;//txt的引用Mylistener(String aa,JTextField txt){//构造方法this.a=aa;this.txt=txt;}void init(){frame.aa=0;//寄存器frame.bb=0;//判断是否为连续输入运算符=0;frame.dd='d';//记录前一次运算符的值this.txt.setText("0");}public void actionPerformed(ActionEvent e){System.out.println(a);if(a=="0"| a=="1"| a=="2" | a=="3"| a=="4"| a=="5"| a=="6"| a=="7" | a=="8" | a=="9" | a=="."){if(frame.bb!=0){this.txt.setText("0");frame.bb=0;}System.out.println("数字"+"b"+frame.bb);if(this.txt.getText().length()==1){//当前文本框里的字符串的长度为一if(a=="."){//当前输入为小数点this.txt.setText(this.txt.getText()+".");}else{//当前输入不为小数点if(this.txt.getText()=="0" & this.a=="0"){this.txt.setText("0");}else if(this.txt.getText().charAt(0)=='0'& this.a!="0"){this.txt.setText(a);}else if(this.txt.getText().charAt(0) != '0'){this.txt.setText(this.txt.getText()+a);}}}else{//当前文本框里的字符串的长度不为一if(a=="."){//当前输入是. 就查找txt的值中有不有 .if(this.txt.getText().indexOf('.')== -1){//没出现.this.txt.setText(this.txt.getText()+a);}else {//原字符串不变}}else{this.txt.setText(this.txt.getText()+a);}}}//**************************************************if(a=="+" | a=="-" | a=="*" | a=="/" ){frame.bb++;if(this.txt.getText().charAt(this.txt.getText().length()-1)=='.'){//处理以.结尾的字符串this.txt.setText(this.txt.getText().substring(0,this.txt.getText().length ()-1));}//如果字符串以.结尾就把字符串的最后以为抹去if(==0){//第一次输入运算符frame.aa=Double.valueOf(this.txt.getText()).doubleValue();=1;frame.dd=this.a.charAt(0);//记录前一次输入运算符的值}else{//在这里面进行四则运算//加法运算if(frame.dd=="+".charAt(0)){frame.aa+=Double.valueOf(this.txt.getText()).doubleValue();this.txt.setText(String.valueOf(frame.aa).toString());frame.dd=this.a.charAt(0);}else if(frame.dd=="-".charAt(0)){frame.aa-=Double.valueOf(this.txt.getText()).doubleValue();this.txt.setText(String.valueOf(frame.aa).toString());frame.dd=this.a.charAt(0);}else if(frame.dd=="*".charAt(0)){frame.aa*=Double.valueOf(this.txt.getText()).doubleValue();this.txt.setText(String.valueOf(frame.aa).toString());frame.dd=this.a.charAt(0);}else if(frame.dd=="/".charAt(0)){if(this.txt.getText().charAt(0)=="0".charAt(0)){//除零是不允许的System.out.println("被除数不能为零");this.init();}else{doubleff=Double.valueOf(this.txt.getText()).doubleValue();frame.aa=frame.aa/ff;this.txt.setText(String.valueOf(frame.aa).toString());frame.dd=this.a.charAt(0);}}}}if(a=="B"){if(this.txt.getText().length()==1 ){this.txt.setText("0");}if(this.txt.getText().length()!=1 &this.txt.getText().charAt(0)!='0'){this.txt.setText(this.txt.getText().substring(0,this.txt.getText().length ()-1));}}if(a=="+/-"){if(this.txt.getText().charAt(0)!='-'){this.txt.setText("-"+this.txt.getText());}else{this.txt.setText(this.txt.getText().substring(1));}}if(a=="E"){this.init();}if(a=="C"){this.txt.setText("0");}if(a=="="){if(!=0){if(frame.dd=="+".charAt(0)){frame.aa+=Double.valueOf(this.txt.getText()).doubleValue();this.txt.setText(String.valueOf(frame.aa).toString());//frame.dd=this.a.charAt(0);}else if(frame.dd=="-".charAt(0)){frame.aa-=Double.valueOf(this.txt.getText()).doubleValue();this.txt.setText(String.valueOf(frame.aa).toString());//frame.dd=this.a.charAt(0);}else if(frame.dd=="*".charAt(0)){frame.aa*=Double.valueOf(this.txt.getText()).doubleValue();this.txt.setText(String.valueOf(frame.aa).toString());//frame.dd=this.a.charAt(0);}else if(frame.dd=="/".charAt(0)){if(this.txt.getText().charAt(0)=="0".charAt(0)){//除零是不允许的System.out.println("被除数不能为零");this.init();}else{doubleff=Double.valueOf(this.txt.getText()).doubleValue();frame.aa=frame.aa/ff;this.txt.setText(String.valueOf(frame.aa).toString());//frame.dd=this.a.charAt(0);}}frame.aa=0;//寄存器frame.bb=1;//判断是否为连续输入运算符=0;frame.dd='d';}}}}。
java简易计算器完整代码
java简易计算器完整代码import java.awt.BorderLayout;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JOptionPane;import javax.swing.JPanel;import javax.swing.JTextField;public class Calculate extends JFrame implements ActionListener {/****/private static final long serialVersionUID = 1L;/*** @param args*/float userFloata=0f;float userFloatb=0f;double result;JLabel label1 ;JLabel label2;JLabel label3;JTextField textField1;JTextField textField2;JTextField textField3;JButton addButton;JButton subtractButton;JButton rideButton;JButton divideButton;public Calculate(){setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);setTitle("简易计算器");JPanel viewJPanel_1=new JPanel();JPanel viewJPanel_2=new JPanel();addButton=new JButton("加");addButton.addActionListener(this);viewJPanel_1.add(addButton);subtractButton=new JButton("减");subtractButton.addActionListener(this);viewJPanel_1.add(subtractButton);rideButton=new JButton("乘");rideButton.addActionListener(this);viewJPanel_1.add(rideButton);divideButton=new JButton("除");divideButton.addActionListener(this);viewJPanel_1.add(divideButton);label1=new JLabel("数据1：");viewJPanel_2.add(label1);textField1=new JTextField(5);textField1.addActionListener(this);viewJPanel_2.add(textField1);label2=new JLabel("数据2：");viewJPanel_2.add(label2);textField2=new JTextField(5);textField2.addActionListener(this);viewJPanel_2.add(textField2);label3=new JLabel("结果是：");viewJPanel_2.add(label3 );textField3=new JTextField(5);viewJPanel_2.add(textField3);setSize(420,120);setVisible(true);validate();getContentPane().add(viewJPanel_1,BorderLayout.NORTH);getContentPane().add(viewJPanel_2,BorderLayout.CENTER);}public void CalculateEventHandel(){try{userFloata= Float.parseFloat(textField1.getText().trim());userFloatb= Float.parseFloat(textField2.getText().trim());} catch (NumberFormatException e) {JOptionPane.showMessageDialog(this, "请输入数字型数据！");textField1.setText("");textField1.requestFocus();textField2.setText("");textField3.setText("");return;}}public static void main(String[] args) { // TODO Auto-generated method stubnew Calculate();//a.CalculateEventHandel();}public void actionPerformed(ActionEvent e) { // TODO Auto-generated method stubif(e.getSource()==addButton){this.CalculateEventHandel();result=userFloata+userFloatb;// System.out.println(""+result);textField3.setText(""+result);}else if(e.getSource()==subtractButton){ this.CalculateEventHandel();result=userFloata-userFloatb;textField3.setText(""+result);}else if(e.getSource()==rideButton){this.CalculateEventHandel();result=userFloata*userFloatb;textField3.setText(""+result);}else if(e.getSource()==divideButton){this.CalculateEventHandel();result=userFloata/userFloatb;textField3.setText(""+result);}}}。
java简单计算器代码
java简单计算器代码Java简单计算器代码：```javaimport java.util.Scanner;public class Calculator {public static void main(String[] args) {Scanner input = new Scanner(System.in);double num1, num2, result = 0;char operator;System.out.print("请输入第一个数：");num1 = input.nextDouble();System.out.print("请输入运算符号（+、-、*、/）："); operator = input.next().charAt(0);System.out.print("请输入第二个数：");num2 = input.nextDouble();switch(operator) {case '+':result = num1 + num2;break;case '-':result = num1 - num2;break;case '*':result = num1 * num2;break;case '/':result = num1 / num2;break;default:System.out.println("运算符输入错误，请重新输入！");return;}System.out.println("运算结果：" + num1 + operator + num2 + "=" + result);}}```列表：1. 首先，在程序中导入`java.util.Scanner`包，以便从控制台读取用户输入内容。
java简易计算机代码
java简易计算机代码Java是一种面向对象的编程语言，广泛应用于计算机编程领域。
下面我们来看一段简易的Java代码，实现一个计算器的功能。
我们需要定义一个Calculator类，代码如下：```javapublic class Calculator {// 定义两个整型变量，用于存储输入的数字private int num1;private int num2;// 构造方法，用于初始化Calculator对象public Calculator(int num1, int num2) {this.num1 = num1;this.num2 = num2;}// 加法运算方法public int add() {return num1 + num2;}// 减法运算方法public int subtract() {return num1 - num2;}// 乘法运算方法public int multiply() {return num1 * num2;}// 除法运算方法public double divide() {// 判断除数是否为0，避免除以0的错误if (num2 != 0) {return (double)num1 / num2;} else {System.out.println("除数不能为0！");return 0;}}// 主方法，程序入口public static void main(String[] args) {// 创建一个Calculator对象，传入两个待计算的数值Calculator calculator = new Calculator(10, 5);// 调用加法运算方法，并输出结果int sum = calculator.add();System.out.println("两数之和：" + sum);// 调用减法运算方法，并输出结果int difference = calculator.subtract();System.out.println("两数之差：" + difference);// 调用乘法运算方法，并输出结果int product = calculator.multiply();System.out.println("两数之积：" + product);// 调用除法运算方法，并输出结果double quotient = calculator.divide();if (quotient != 0) {System.out.println("两数之商：" + quotient);}}}```在上面的代码中，我们首先定义了一个Calculator类，包含了两个私有的整型变量num1和num2，用于存储输入的数字。
用java编写一个简易的计算器代码
import java.awt.BorderLayout;import java.awt.Color;import java.awt.GridLayout;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.event.KeyEvent;import java.awt.event.KeyListener;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JPanel;import javax.swing.JTextField;/使用java 语言开发一个简易计算器/public class TestJsq extends JFrame implements ActionListener, KeyListener {private JTextField jtf;private JButton jb_bk, jb_ce, jb_c;private String xs = "";private double sum = 0;private int fh;public static void main(String[] args) {new TestJsq().creatCUI();}public void creatCUI() {JFrame jf = new JFrame();jf.setTitle("计算器");jtf = new JTextField("0.");jtf.setHorizontalAlignment(JTextField.RIGHT);jf.add(jtf, BorderLayout.NORTH);JPanel jp_main = new JPanel(new BorderLayout());jf.add(jp_main);JPanel jp1 = new JPanel(new GridLayout(1, 3, 1, 1));jb_bk = new JButton("Backspace");jb_bk.setForeground(Color.RED);jb_bk.addActionListener(this);jb_ce = new JButton("CE");jb_ce.setForeground(Color.RED);jb_ce.addActionListener(this);jb_c = new JButton("C");jb_c.setForeground(Color.RED);jb_c.addActionListener(this);jp1.add(jb_bk);jp1.add(jb_ce);jp1.add(jb_c);jp_main.add(jp1, BorderLayout.NORTH);JPanel jp2 = new JPanel(new GridLayout(4, 5, 1, 1));String str[] = { "7", "8", "9", "/", "sqrt", "4", "5", "6", "", "%","1", "2", "3", "-", "1/x", "0", "+/-", ".", "+", "=" };for (int i = 0; i < 20; i++) {JButton jb = new JButton(str[i]);jb.addActionListener(this);jb.setForeground(Color.blue);if (i == 3 || i == 8 || i == 13 || i == 18 || i == 19) { jb.setForeground(Color.RED);}jp2.add(jb);}jp_main.add(jp2, BorderLayout.CENTER);jf.setResizable(false);jf.setBounds(50, 50, 350, 350);jf.setVisible(true);}Overridepublic void actionPerformed(ActionEvent e) {String s = e.getActionCommand();if (s.equals("CE") || s.equals("C")) {xs = "";jtf.setText("0.");} else if (s.equals("Backspace")) {String str = xs.substring(0, xs.length() - 1);xs = str;jtf.setText(xs);} else if (s.equals("7") || s.equals("8") || s.equals("9") || s.equals("4") || s.equals("5") || s.equals("6")|| s.equals("1") || s.equals("2") || s.equals("3")|| s.equals("0") || s.equals(".")) {xs = xs + s;jtf.setText(xs);} else if (s.equals("+/-")) {double x = Double.parseDouble(xs);xs="" + (-x);jtf.setText(xs);} else if (s.equals("/")) {fh = 4;int point = xs.indexOf(".");if (point = -1) {String strt = xs.substring(0, point);String z = xs.substring(point + 1, xs.length());int z_num = z.length();sum = Integer.decode(strt) + (double) (Integer.decode(z))/ (10 z_num);} else {sum = Integer.decode(xs);}xs = "";jtf.setText(null);} else if (s.equals("")) {fh = 3;int point = xs.indexOf(".");if (point = -1) {String strt = xs.substring(0, point);String z = xs.substring(point + 1, xs.length());int z_num = z.length();sum = Integer.decode(strt) + (double) (Integer.decode(z))/ (10 z_num);} else {sum = Integer.decode(xs);}xs = "";jtf.setText(null);} else if (s.equals("-")) {fh = 2;int point = xs.indexOf(".");if (point = -1) {String strt = xs.substring(0, point);String z = xs.substring(point + 1, xs.length());int z_num = z.length();sum = Integer.decode(strt) + (double) (Integer.decode(z))/ (10 z_num);} else {sum = Integer.decode(xs);}xs = "";jtf.setText(null);} else if (s.equals("+")) {fh = 1;int point = xs.indexOf(".");if (point = -1) {String strt = xs.substring(0, point);String z = xs.substring(point + 1, xs.length());int z_num = z.length();sum = Integer.decode(strt) + (double) (Integer.decode(z))/ (10 z_num);} else {sum = Integer.decode(xs);}xs = "";jtf.setText(null);} else if (s.equals("sqrt")) {double x = Double.parseDouble(xs);double x1 = Math.sqrt(x);xs = x1 + "";jtf.setText(xs);} else if (s.equals("%")) {double x = Double.parseDouble(xs);x=0.01 xx;xs=x+"";jtf.setText(xs);} else if (s.equals("1/x")) {if (xs == "0") {jtf.setText("除数不能为0");} else {double x = Double.parseDouble(xs);double x1 = 1 / x;xs = x1 + "";jtf.setText(String.valueOf(xs));}} else if (s.equals("=")) {if (fh = 0) {switch (fh) {case 1:int point1 = xs.indexOf(".");if (point1 = -1) {String s1 = xs.substring(0, point1);String z1 = xs.substring(point1 + 1, xs.length());int z1_num = z1.length();xs = "";double ss1 = Integer.decode(s1)+ (double) Integer.decode(z1) / (10 z1_num);sum = sum + ss1;} else {sum = sum + Integer.decode(xs);xs = "";}fh = 0;break;case 2:int point2 = xs.indexOf(".");if (point2 = -1) {String s2 = xs.substring(0, point2);String z2 = xs.substring(point2 + 1, xs.length());int z2_num = z2.length();xs = "";double ss2 = Integer.decode(s2)+ (double) Integer.decode(z2) / (10 z2_num);sum = sum - ss2;} else {sum = sum - Integer.decode(xs);xs = "";}fh = 0;break;case 3:int point3 = xs.indexOf(".");if (point3 = -1) {String s3 = xs.substring(0, point3);String z3 = xs.substring(point3 + 1, xs.length());int z1_num = z3.length();xs = "";double s4 = Integer.decode(s3)+ (double) Integer.decode(z3) / (10 z1_num);sum = sum s4;} else {sum = sum Integer.decode(xs);xs = "";}fh = 0;break;case 4:int point4 = xs.indexOf(".");if (point4 = -1) {String s4 = xs.substring(0, point4);String z4 = xs.substring(point4 + 1, xs.length());int z4_num = z4.length();xs = "";double s5 = Integer.decode(s4)+ (double) Integer.decode(z4) / (10 z4_num);sum = sum / s5;} else {sum = sum / Integer.decode(xs);xs = "";}fh = 0;break;default:break;}xs = String.valueOf(sum);jtf.setText(xs);fh = 0;} else {jtf.setText(null);}}}Overridepublic void keyPressed(KeyEvent e) {// TODO Auto-generated method stub}Overridepublic void keyReleased(KeyEvent e) { // TODO Auto-generated method stub }Overridepublic void keyTyped(KeyEvent e) { // TODO Auto-generated method stub }}。
java简单计算器代码
java简单计算器代码public class Calculator {public static void main(String[] args) {Calculator calculator = new Calculator(); //创建对象调⽤函数Scanner scanner = new Scanner(System.in); //创建scanner扫描对象，获取⽤户输⼊数据System.out.println("请输⼊第⼀个数据");double a=scanner.nextDouble();System.out.println("请输⼊运算符：");String operator=scanner.next();System.out.println("请输⼊第⼆个数据");double b= scanner.nextDouble();double result=0;//存储最后的计算结果scanner.close();//关闭scanner资源// 根据输⼊的运算符调⽤不同的⽅法if ("+".equals(operator)){//equals判断字符是否相等result= calculator.add(a,b);}//调⽤减法else if ("-".equals(operator)){result=calculator.sub(a,b);}else if ("*".equals(operator)){result=calculator.multiply(a,b);}else if ("/".equals(operator)){result=calculator.div(a,b);}System.out.println("最终结果为"+result);}public double add(double a,double b){return a+b;}public double sub(double a,double b){return a-b;}public double multiply(double a, double b){return a*b;}public double div(double a, double b){return a/b;}}。
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buttonseven=new JButton("7");
buttoneight=new JButton("8");
buttonnine=new JButton("9");
panelcenter.setLayout(new GridLayout(3,3));//设置面板布局为网格布局，3行3列
* @author Fjsh
*/
public class CalcultorThree {
//新建对象，在构造函数中进行初始化
JFrame frame;//新建窗体对象
JButton buttonzero,buttondot,buttonequal;//新建按钮“0”“.”“=”
JButton buttonplus,buttonminus,buttonmultiple,buttondevision,
import java.awt.event.ActionListener;//导入事件监听者类
import javax.swing.JButton;//导入按钮类
import javax.swing.JFrame;//导入窗体
import javax.swing.JPanel;//导入面板
/**
*本例实现了简单计算器代码，具备加减乘除和正弦功能，旨在抱砖引玉。熟悉java的同学，可以在此基础上实现更复杂的功能。
panelwest.setLayout(new GridLayout(3,1));
panelwest.add(buttonzero);
panelwest.add(buttondot);
panelwest.add(buttonequal);
//构造操作按钮“+”“-”“*”“/”“sin”“>0”，其中“>0”为归零按钮
buttontwo.addActionListener(h);
buttonthree.addActionListener(h);
buttonfour.addActionListener(h);
buttonfive.addActionListener(h);
buttonsix.addActionListener(h);
JPanel panelwest,panelcenter,paneleast;//新建三个面板
TextField tf;//新建文本区域对象
public CalcultorThree(){
//初始化对象
tf=new TextField(30);//构造空文本字段，字符宽度为30
frame =new JFrame("CalculatorThree");//构造窗体对象，名称为“CalculatorThree”
buttondot=new JButton(".");
buttonequal=new JButton("=");
buttonzero.addActionListener(h);
buttondot.addActionListener(h);
buttonequal.addActionListener(h);
//创建数字按钮对象，1、2、3、4、5、6、7、8、9
buttonone=new JButton("1");
buttontwo=new JButton("2");
buttonthree=new JButton("3");
buttonfour=new JButton("4");
buttonfive=new JButton("5");
buttonseven.addActionListener(h);
buttoneight.addActionListener(h);
buttonnine.addActionListener(h);
//构造按钮““.”“=”，注册事件监听器，设置1行3列的布局，添加到到西边的面板
buttonzero=new JButton("0");
//将数字按钮添加到中间面板
panelcenter.add(buttonone);
panelcenter.add(buttontwo);
panelcenter.add(buttonthree);
panelcenter.add(buttonfour);
panelcenter.add(buttonfive);
package calcultorthree;
import java.awt.BorderLayout;//导入边界布局管理器类
import java.awt.GridLayout;//导入网格布局管理器类
import java.awt.TextField;//导入文本区域类
import java.awt.event.ActionEvent;//导入事件类
panelcenter.add(buttonsix);
panelcenter.add(buttonseven);
panelcenter.add(buttoneight);
panelcenter.add(buttonnine);
//为10个按钮注册事件监听器
buttonone.addActionListener(h);
panelcenter=new JPanel();//构造面板，放到窗体中央
panelwest=new JPanel();//构造面板，放到窗体西边
paneleast=new JPanel();//构造面板，放到窗体东边
Handle h=new Handle();//新建Handle类对象，Handle类为事件监听类
buttonplus=new JButton("+");
buttonminus=new JButton("-");
buttonmultiple=new JButton("*");
buttonsin,buttontozero;//新建按钮“+”“-”“*”“/”“sin”和归零按钮
JButton buttonone,buttontwo,buttonthree,buttonfour,buttonfive,buttonsix,
buttonseven,buttoneight,buttonnine;//新建数字按钮“0”“1”“2”“3”“4”“5”“6”“7”“8”“9”