java编写的简单计算器代码
JAVA-复数计算器
JAVA-复数计算器使⽤java组件做⼀个复数计算器⾸先,建三个类:⼀个组件类,⼀个类(将⽂本框与字符封装起来),⼀个复数类。
下⾯是组件类的代码:package b;import java.awt.*;import java.awt.event.*;import javax.swing.*;import javax.swing.event.*;public class JComplex extends JFrame implements ActionListener{//设置组件public JComboBox<String> combox_add,combox_minus;private static String[] add={"+","-"};private static String[] minus={"+","-"};private JButton button_equal;//建⾯板类的对象ComJPanel x1=new ComJPanel();ComJPanel x2=new ComJPanel();ComJPanel x3=new ComJPanel();ComJPanel result=new ComJPanel();public JComplex(){super("复数运算器");this.setLayout(null);this.setSize(400,220);this.setLocationRelativeTo(null);//添加组件this.add(box_add=new JComboBox<String>(JComplex.add));this.add(box_minus=new JComboBox<String>(JComplex.minus));this.add(this.button_equal=new JButton("="));this.add(x1);this.add(x2);this.add(x3);this.add(result);//设置组件的距离和⼤⼩combox_add.setBounds(20, 70, 60, 30);combox_minus.setBounds(20, 110, 60, 30);button_equal.setBounds(20, 150, 60, 30);x1.setBounds(100, 5, 300, 50);x2.setBounds(100, 50, 300, 50);x3.setBounds(100, 100, 300, 50);result.setBounds(100, 150, 300, 50);//设置动作监听combox_add.addActionListener(this);combox_minus.addActionListener(this);button_equal.addActionListener(this);this.setDefaultCloseOperation(EXIT_ON_CLOSE);this.setVisible(true);}public void actionPerformed(ActionEvent e){//获取⽂本框的内容String s1=x1.text_real.getText();String s2=x1.text_i.getText();String s3=x2.text_real.getText();String s4=x2.text_i.getText();String s5=x3.text_real.getText();String s6=x3.text_i.getText();//建复数类的对象Complex c1=new Complex(s1,s2);Complex c2=new Complex(s3,s4);Complex c3=new Complex(s5,s6);//动作响应if(e.getSource().equals(combox_add)){if(combox_add.getSelectedItem().equals("+")) combox_add.setSelectedItem("+");else if(combox_add.getSelectedItem().equals("-")) combox_add.getSelectedItem().equals("-");}if(e.getSource().equals(combox_minus)){if(combox_minus.getSelectedItem().equals("+")) combox_minus.setSelectedItem("+");else if(combox_minus.getSelectedItem().equals("-")) combox_minus.setSelectedItem("-");}if(e.getSource().equals(button_equal)){if(combox_add.getSelectedItem().equals("+")){c1.add(c2);}else if(combox_add.getSelectedItem().equals("-")) {c1.minus(c2);}if(combox_minus.getSelectedItem().equals("+")){c1.add(c3);}else if(combox_minus.getSelectedItem().equals("-")) {c1.minus(c3);}}result.text_real.setText(Double.toString(c1.x)); result.text_i.setText(Double.toString(c1.y));}public static void main(String []args){new JComplex();}}class ComJPanel extends JPanel {private JLabel label_add,label_i;JTextField text_real,text_i;String s1,s2;public ComJPanel(){//⾯板类this.setLayout(null);this.add(this.text_real=new JTextField());this.add(bel_add=new JLabel("+"));this.add(this.text_i=new JTextField());this.add(bel_i=new JLabel("i"));text_real.setBounds(20,0,100,30);text_i.setBounds(150,0,100, 30);label_add.setBounds(130,0,20, 25); label_i.setBounds(260,0,20, 25);}}复数类就是简单的复数类,就不贴代码啦。
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计算器程序代码
import java.awt.*;//计算器实例import java.awt.event.*;public class calculator{public static void main(String args[]){MyWindow my=new MyWindow("计算器");}}class MyWindow extends Frame implements ActionListener{ StringBuffer m=new StringBuffer();int p;TextField tex;Buttonb0,b1,b2,b3,b4,b5,b6,b7,b8,b9,jia,jian,cheng,chu,deng,dian,qingling,kaifang;MyWindow(String s){super(s);//StringBuffer s2=new StringBuffer();//String s;tex=new TextField(18);b0=new Button(" 0 ");b1=new Button(" 1 ");b2=new Button(" 2 ");b3=new Button(" 3 ");b4=new Button(" 4 ");b5=new Button(" 5 ");b6=new Button(" 6 ");b7=new Button(" 7 ");b8=new Button(" 8 ");b9=new Button(" 9 ");dian=new Button(" . ");jia=new Button(" + ");jian=new Button(" - ");cheng=new Button(" × ");chu=new Button(" / ");deng=new Button(" = ");qingling=new Button(" 清零 ");kaifang=new Button(" √ ");setLayout(new FlowLayout());add(tex);add(b0);add(b1);add(b2);add(b3);add(b4);add(b5);add(b6);add(b7);add(b8);add(b9);add(dian);add(jia);add(jian);add(cheng);add(chu);add(kaifang);add(qingling);add(deng);b0.addActionListener(this);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);jia.addActionListener(this);jian.addActionListener(this);cheng.addActionListener(this);chu.addActionListener(this);dian.addActionListener(this);deng.addActionListener(this);qingling.addActionListener(this); kaifang.addActionListener(this);setBounds(200,200,160,280);setResizable(false);//不可改变大小setVisible(true);validate();addWindowListener(new WindowAdapter(){ public void windowClosing(WindowEvent ee){ System.exit(0);}});}public void actionPerformed(ActionEvent e){if(e.getSource()==b0){m=m.append("0");tex.setText(String.valueOf(m));}if(e.getSource()==b1){m=m.append("1"); tex.setText(String.valueOf(m)); }if(e.getSource()==b2){m=m.append("2"); tex.setText(String.valueOf(m)); }if(e.getSource()==b3){m=m.append("3"); tex.setText(String.valueOf(m)); }if(e.getSource()==b4){m=m.append("4"); tex.setText(String.valueOf(m));}if(e.getSource()==b5){m=m.append("5"); tex.setText(String.valueOf(m)); }if(e.getSource()==b6){m=m.append("6"); tex.setText(String.valueOf(m)); }if(e.getSource()==b7){m=m.append("7"); tex.setText(String.valueOf(m)); }if(e.getSource()==b8){m=m.append("8"); tex.setText(String.valueOf(m)); }if(e.getSource()==b9){m=m.append("9"); tex.setText(String.valueOf(m)); }if(e.getSource()==jia){m=m.append("+"); tex.setText(String.valueOf(m)); }if(e.getSource()==jian){m=m.append("-"); tex.setText(String.valueOf(m)); }if(e.getSource()==cheng){m=m.append("*"); tex.setText(String.valueOf(m)); }if(e.getSource()==chu){m=m.append("/"); tex.setText(String.valueOf(m)); }if(e.getSource()==dian){m=m.append("."); tex.setText(String.valueOf(m)); }String mm=String.valueOf(m);int p1=mm.indexOf("+");int p2=mm.indexOf("-");int p3=mm.indexOf("*");int p4=mm.indexOf("/");if(p1!=-1){p=p1;}else if(p3!=-1){p=p3;}else if(p2!=-1){p=p2;}else if(p4!=-1){p=p4;}if(e.getSource()==deng){String m1=mm.substring(0,p);String m2=mm.substring(p+1);String ch=mm.substring(p,p+1);//System.out.println(m1);//System.out.println(m2);//System.out.println(ch);if(ch.equals("+")){float n1=Float.parseFloat(m1); float n2=Float.parseFloat(m2); float sum=n1+n2;String su=String.valueOf(sum); tex.setText(su);}if(ch.equals("-")){float n1=Float.parseFloat(m1);float n2=Float.parseFloat(m2);float sum=n1-n2;String su=String.valueOf(sum);tex.setText(su);}if(ch.equals("*")){float n1=Float.parseFloat(m1);float n2=Float.parseFloat(m2);float sum=n1*n2;String su=String.valueOf(sum);tex.setText(su);}if(ch.equals("/")){float n1=Float.parseFloat(m1);float n2=Float.parseFloat(m2);float sum=n1/n2;String su=String.valueOf(sum);tex.setText(su);}}if(e.getSource()==qingling){StringBuffer kk=new StringBuffer(); m=kk;tex.setText("0");// System.out.println(mm);}if(e.getSource()==kaifang){String t=tex.getText();float num=Float.parseFloat(t);double nub=Math.sqrt(num);tex.setText(String.valueOf(nub)); }}}。
Java实现简易计算器
Java实训作业题目:Java实现简易计算器学院:姓名:学号:班级:20 年月一、实验目的通过课程设计,主要要达到两个目的,一是检验和巩固专业知识、二是提高综合素质和能力。
此次课程设计实训主要是Java语言程序设计的实现。
通过该课程设计,可以将课堂上掌握的理论知识与处理数据的业务相结合,以检验自己掌握知识的宽度、深度及对知识的综合运用能力。
二、实验要求用Java编写一个简单的计算器,使其能够实现最基本的功能,如简单的加、减、乘、除;平方根,倒数,平方等功能。
三、详细内容1.界面设计界面设计使用GUI,其中有用到swing组件的TextField和Button,用到awt中的BorderLayout和GridLayout布局管理方式,其图形界面如图1-1所示:图1-1其中主要代码为:public mainWindow(){this.setTitle("计算器");//用户图形界面标题this.setVisible(true);//用户图形界面可缩小this.setResizable(false);//用户图形界面不可放大this.setSize(350,300);//设置用户图形界面的大小this.setLocation(400,150);//用户图形界面在屏幕中的显示位置JPanel panel1 = new JPanel();//新建一个画板JPanel panel2 = new JPanel();button1 = new JButton("1");...reset = new JButton("CE");Container container = this.getContentPane();container.add(panel2,BorderLayout.NORTH);container.add(panel1);panel1.setLayout(new GridLayout(5,4));//将画板1分为4行5列result.setEnabled(false);result.setFont(new Font("Dialog",Font.BOLD,25));//运算结果的字体大小result.setEditable(false);result.setHorizontalAlignment(SwingConstants.RIGHT);panel1.add(reciprocal);//分别将20个按钮依次添加到画板panel1中,并设置各自的大小reciprocal.setFont(new Font("Dialog",Font.PLAIN,20));...panel1.add(divide);divide.setFont(new Font("Dialog",Font.PLAIN,20));panel2.setLayout(new GridLayout());panel2.add(result);//画板panel2添加运算结果2.四则运算较为简单的实现了简单的加、减、乘、除运算,主要代码如下:ActionListener equal1 = new ActionListener(){ //实现四则运算public void actionPerformed(ActionEvent e){String str = result.getText();b = DatatypeConverter.parseDouble(str);{if(flag == "+")c = a + b;else if(flag == "-")c = a - b;else if(flag == "*")c = a * b;else if(flag == "/" || b != 0)c = a / b;}if(flag != "=")result.setText("" + c);elseresult.setText("零不能做除数!");a = 0;b = 0;c = 0;flag = "";}};3.其他功能另外添加了平方根,倒数,平方等功能,主要代码如下:平方根运算的实现:ActionListener sqrt1= new ActionListener(){public void actionPerformed(ActionEvent e){String str = result.getText();double i = DatatypeConverter.parseDouble(str);i = Math.sqrt(i);result.setText("" + i);}};倒数运算的实现:ActionListener reciprocal1 = new ActionListener(){ public void actionPerformed(ActionEvent e){String str = result.getText();double i = DatatypeConverter.parseDouble(str);i = 1/i;result.setText("" + i);}};平方运算的实现:ActionListener square1 = new ActionListener(){public void actionPerformed(ActionEvent e){String str = result.getText();double i = DatatypeConverter.parseDouble(str);i = i*i;result.setText("" + i);}};4.程序测试经测试发现本计算器基本功能均能实现,可正常运行计算,针对功能实现的代码部分过于简单,可以对其进行改善提高,方便用户使用!5.实训小结通过对计算器窗体的编写,熟悉了java图形用户界面的设计原理和程序结构,熟悉了java中awt和swing的组合。
java计算器源代码(仿win7)
java计算器源代码(仿win7)import java.awt.*;import javax.swing.*;import java.awt.event.*;class Cal extends JFrame implements ActionListener,MouseListener{JMenuBar menubar;JMenu menu_check,menu_edit,menu_help;JMenuItem menuitem_science,menuitem_check,menuitem_exit,menuitem_copy,menuitem_paste,menuitem1_copy,menuitem1_paste,menuitem_chelp,menuitem_about;JCheckBoxMenuItem menuitem_standard;JTextField ta1;int x,result2;double op1,op2,opall;private boolean end=false,flag=false,add=false,sub=false,cheng=false,chu=false,flagop2=false;JButton b_mc,b_mr,b_ms,b_mjia,b_mjian,b_tui,b_ce,b_c,b_jj,b_dui,b_7,b_8,b_9,b_chu,b_baifenhao,b_4,b_5,b_6,b_cheng,b_daoshu,b_1,b_2,b_3,b_jian,b_0,b_dian,b_jia,b_dengyu;JPanel p_all,p_button1,p_button2,p_txt,p1,p2,p3,p4,p5;private String str,resultstr;JPopupMenu popupmenu;Container con=this.getContentPane();Font font=new Font("微软雅黑",Font.PLAIN,12);Color color=new Color(120,220,120);Cal(String s){super(s);setSize(220,315);setResizable(false);setVisible(true);Dimension scr=Toolkit.getDefaultToolkit().getScreenSize();Dimension frm=this.getSize();setLocation((scr.width-frm.width)/2,(scr.height-frm.height)/2);Toolkit tk=Toolkit.getDefaultToolkit();//程序默认图标设置setIconImage(tk.createImage("D:\\sd.jpg"));setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//-----------------------------------------------------------------制作框架结构------------------------- //---------------------------------------菜单栏---------------------------menubar=new JMenuBar();menubar.setPreferredSize(new Dimension(frm.width,19));menu_check=new JMenu("查看(V)");menu_check.setFont(font);menu_check.setForeground(Color.black);menuitem_standard=new JCheckBoxMenuItem("标准型",true);menuitem_standard.setFont(font);menuitem_standard.setForeground(Color.black);menuitem_science=new JMenuItem("科学型");menuitem_science.setFont(font);menuitem_science.setForeground(Color.black);menuitem_check=new JMenuItem("查看分组");menuitem_check.setFont(font);menuitem_check.setForeground(Color.black);menuitem_exit=new JMenuItem("退出");menuitem_exit.setFont(font);menuitem_exit.setForeground(Color.black);menuitem_exit.addActionListener(this);menu_check.add(menuitem_standard);menu_check.add(menuitem_science);menu_check.addSeparator();menu_check.add(menuitem_check);menu_check.addSeparator();menu_check.add(menuitem_exit);menubar.add(menu_check);menu_edit=new JMenu("编辑(E)");menu_edit.setFont(font);menu_edit.setForeground(Color.black);menu_edit.setMnemonic(KeyEvent.VK_E);menuitem_copy=new JMenuItem("复制(C) ");menuitem_copy.setFont(font);menuitem_copy.setForeground(Color.black);menuitem_copy.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_C,InputEvent.CTRL_M ASK));menuitem_copy.addActionListener(this);menuitem_paste=new JMenuItem("粘贴(P) ");menuitem_paste.setFont(font);menuitem_paste.setForeground(Color.black);menuitem_paste.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_V,InputEvent.CTRL_M ASK));menuitem_paste.addActionListener(this);menu_edit.add(menuitem_copy);menu_edit.add(menuitem_paste);menubar.add(menu_edit);menu_help=new JMenu("帮助(H)");menu_help.setFont(font);menu_help.setForeground(Color.black);menuitem_chelp=new JMenuItem("查看帮助");menuitem_chelp.setFont(font);menuitem_chelp.setForeground(Color.black);menuitem_about=new JMenuItem("关于计算器");menuitem_about.setFont(font);menuitem_about.setForeground(Color.black);menuitem_about.addActionListener(this);menu_help.add(menuitem_chelp);menu_help.addSeparator();menu_help.add(menuitem_about);menubar.add(menu_help);setJMenuBar(menubar);//--------------------------------------文本框----------------------------------ta1=new JTextField("0");ta1.setFont(new Font("微软雅黑",Font.PLAIN,13));ta1.setEditable(false);//ta1.setOpaque(false);ta1.setHorizontalAlignment(JTextField.RIGHT);ta1.setPreferredSize(new Dimension((frm.width-26),45));ta1.addMouseListener(this);p_all=new JPanel();p_all.setPreferredSize(new Dimension((frm.width-6),250));//p_all.setBackground(color);p_all.setLayout(new FlowLayout(FlowLayout.CENTER,0,3));p_txt=new JPanel();p_txt.setPreferredSize(new Dimension((frm.width-6),53));p_txt.setLayout(new FlowLayout(FlowLayout.CENTER,0,7));p_txt.add(ta1);p_all.add(p_txt);con.add(p_all,BorderLayout.CENTER);//-------------------------------------按钮区----------------------------------p_button1=new JPanel();p_button1.setPreferredSize(new Dimension((frm.width-25),131)); p_button1.setLayout(new FlowLayout(FlowLayout.LEFT,0,3));p_all.add(p_button1);p1=new JPanel();p1.setPreferredSize(new Dimension((frm.width-25),127));p1.setLayout(new GridLayout(4,5,5,6));b_mc=new JButton("MC");b_mc.setFont(new Font("微软雅黑",Font.PLAIN,11));b_mc.setMargin(new Insets(0,0,0,0));b_mc.setForeground(Color.blue);b_mc.addActionListener(this);b_mr=new JButton("MR");b_mr.setFont(new Font("微软雅黑",Font.PLAIN,11));b_mr.setMargin(new Insets(0,0,0,0));b_mr.setForeground(Color.blue);b_mr.addActionListener(this);b_ms=new JButton("MS");b_ms.setFont(new Font("微软雅黑",Font.PLAIN,11));b_ms.setMargin(new Insets(0,0,0,0));b_ms.setForeground(Color.blue);b_ms.addActionListener(this);b_mjia=new JButton("M+");b_mjia.setFont(new Font("微软雅黑",Font.PLAIN,11));b_mjia.setMargin(new Insets(0,0,0,0));b_mjia.setForeground(Color.blue);b_mjia.addActionListener(this);b_mjian=new JButton("M-");b_mjian.setFont(new Font("微软雅黑",Font.PLAIN,11)); b_mjian.setMargin(new Insets(0,0,0,0));b_mjian.setForeground(Color.blue);b_mjian.addActionListener(this);b_tui=new JButton("←");b_tui.setFont(new Font("微软雅黑",Font.BOLD,14));b_tui.setMargin(new Insets(0,0,0,0));b_tui.addActionListener(this);b_tui.setForeground(Color.red);b_ce=new JButton("CE");b_ce.setFont(new Font("微软雅黑",Font.PLAIN,11));b_ce.setMargin(new Insets(0,0,0,0));b_ce.setForeground(Color.red);b_ce.addActionListener(this);b_c=new JButton("C");b_c.setFont(new Font("微软雅黑",Font.PLAIN,11));b_c.setMargin(new Insets(0,0,0,0));b_c.setForeground(Color.red);b_c.addActionListener(this);b_jj=new JButton("±");b_jj.setFont(new Font("微软雅黑",Font.PLAIN,14));b_jj.setMargin(new Insets(0,0,0,0));b_jj.setForeground(Color.red);b_jj.addActionListener(this);b_dui=new JButton("√");b_dui.setFont(new Font("微软雅黑",Font.PLAIN,11)); b_dui.setMargin(new Insets(0,0,0,0));b_dui.setForeground(Color.red);b_dui.addActionListener(this);b_7=new JButton("7");b_7.setFont(new Font("微软雅黑",Font.PLAIN,14));b_7.setMargin(new Insets(0,0,0,0));b_7.setForeground(Color.blue);b_7.setMnemonic(KeyEvent.VK_7);b_7.addActionListener(this);b_8=new JButton("8");b_8.setFont(new Font("微软雅黑",Font.PLAIN,14));b_8.setMargin(new Insets(0,0,0,0));b_8.setForeground(Color.blue);b_8.setMnemonic(KeyEvent.VK_8);b_8.addActionListener(this);b_9=new JButton("9");b_9.setMargin(new Insets(0,0,0,0));b_9.setForeground(Color.blue);b_9.setMnemonic(KeyEvent.VK_9);b_9.addActionListener(this);b_chu=new JButton("/");b_chu.setFont(new Font("微软雅黑",Font.PLAIN,14));b_chu.setMargin(new Insets(0,0,0,0));b_chu.setForeground(Color.red);b_chu.addActionListener(this);b_baifenhao=new JButton("%");b_baifenhao.setFont(new Font("微软雅黑",Font.PLAIN,11)); b_baifenhao.setMargin(new Insets(0,0,0,0));b_baifenhao.setForeground(Color.blue);b_baifenhao.addActionListener(this);b_4=new JButton("4");b_4.setFont(new Font("微软雅黑",Font.PLAIN,14));b_4.setMargin(new Insets(0,0,0,0));b_4.setForeground(Color.blue);b_4.setMnemonic(KeyEvent.VK_4);b_4.addActionListener(this);b_5=new JButton("5");b_5.setFont(new Font("微软雅黑",Font.PLAIN,14));b_5.setMargin(new Insets(0,0,0,0));b_5.setForeground(Color.blue);b_5.setMnemonic(KeyEvent.VK_5);b_5.addActionListener(this);b_6=new JButton("6");b_6.setFont(new Font("微软雅黑",Font.PLAIN,14));b_6.setMargin(new Insets(0,0,0,0));b_6.setForeground(Color.blue);b_6.setMnemonic(KeyEvent.VK_6);b_6.addActionListener(this);b_cheng=new JButton("*");b_cheng.setFont(new Font("微软雅黑",Font.PLAIN,14));b_cheng.setMargin(new Insets(0,0,0,0));b_cheng.setForeground(Color.red);b_cheng.addActionListener(this);b_daoshu=new JButton("1/x");b_daoshu.setFont(new Font("微软雅黑",Font.PLAIN,11)); b_daoshu.setMargin(new Insets(0,0,0,0));b_daoshu.setForeground(Color.blue);b_daoshu.addActionListener(this);b_1=new JButton("1");b_1.setMargin(new Insets(0,0,0,0));b_1.setForeground(Color.blue);b_1.setMnemonic(KeyEvent.VK_1);b_1.addActionListener(this);b_2=new JButton("2");b_2.setFont(new Font("微软雅黑",Font.PLAIN,14)); b_2.setMargin(new Insets(0,0,0,0));b_2.setForeground(Color.blue);b_2.setMnemonic(KeyEvent.VK_2);b_2.addActionListener(this);b_3=new JButton("3");b_3.setFont(new Font("微软雅黑",Font.PLAIN,14)); b_3.setMargin(new Insets(0,0,0,0));b_3.setForeground(Color.blue);b_3.setMnemonic(KeyEvent.VK_3);b_3.addActionListener(this);b_jian=new JButton("-");b_jian.setFont(new Font("微软雅黑",Font.PLAIN,14)); b_jian.setMargin(new Insets(0,0,0,0));b_jian.setForeground(Color.red);b_jian.addActionListener(this);b_0=new JButton("0");b_0.setFont(new Font("微软雅黑",Font.PLAIN,14)); b_0.setMargin(new Insets(0,0,0,0));b_0.setPreferredSize(new Dimension(75,27));b_0.setForeground(Color.blue);b_0.setMnemonic(KeyEvent.VK_0);b_0.addActionListener(this);JLabel L1=new JLabel();L1.setPreferredSize(new Dimension(5,3));b_dian=new JButton(".");b_dian.setFont(new Font("微软雅黑",Font.BOLD,14)); b_dian.setMargin(new Insets(0,0,0,0));b_dian.setPreferredSize(new Dimension(35,27));b_dian.setForeground(Color.blue);b_dian.addActionListener(this);JLabel L2=new JLabel();L2.setPreferredSize(new Dimension(5,3));b_jia=new JButton("+");b_jia.setFont(new Font("微软雅黑",Font.BOLD,14)); b_jia.setMargin(new Insets(0,0,0,0));b_jia.setPreferredSize(new Dimension(35,27));b_jia.setForeground(Color.red);b_jia.addActionListener(this);b_dengyu=new JButton("=");b_dengyu.setFont(new Font("微软雅黑",Font.BOLD,22));b_dengyu.setMargin(new Insets(0,0,0,0));b_dengyu.setPreferredSize(new Dimension(35,60));b_dengyu.setForeground(Color.blue);b_dengyu.addActionListener(this);p1.add(b_mc);p1.add(b_mr);p1.add(b_ms);p1.add(b_mjia);p1.add(b_mjian);p1.add(b_tui);p1.add(b_ce);p1.add(b_c);p1.add(b_jj);p1.add(b_dui);p1.add(b_7);p1.add(b_8);p1.add(b_9);p1.add(b_chu);p1.add(b_baifenhao);p1.add(b_4);p1.add(b_5);p1.add(b_6);p1.add(b_cheng);p1.add(b_daoshu);p_button1.add(p1);p_button2=new JPanel();p_button2.setPreferredSize(new Dimension((frm.width-24),65)); p_button2.setLayout(new FlowLayout(FlowLayout.LEFT,0,0));p_all.add(p_button2);p2=new JPanel();p2.setPreferredSize(new Dimension(156,65));p2.setLayout(new FlowLayout(FlowLayout.LEFT,0,1));p3=new JPanel();p3.setPreferredSize(new Dimension(39,62));p3.setLayout(new FlowLayout(FlowLayout.LEFT,4,0));p_button2.add(p2);p_button2.add(p3);p4=new JPanel();p4.setPreferredSize(new Dimension(156,27));p4.setLayout(new GridLayout(1,4,5,5));p5=new JPanel();p5.setPreferredSize(new Dimension(156,39));p5.setLayout(new FlowLayout(FlowLayout.LEFT,0,5));p2.add(p4);p2.add(p5);p4.add(b_1);p4.add(b_2);p4.add(b_3);p4.add(b_jian);p5.add(b_0);p5.add(L1);p5.add(b_dian);p5.add(L2);p5.add(b_jia);p3.add(b_dengyu);//---------------------------------------快捷菜单对象-------------------------popupmenu=new JPopupMenu(); //快捷菜单对象menuitem1_copy=new JMenuItem("复制");menuitem1_copy.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_C,InputEvent.CTRL_ MASK));menuitem1_copy.addActionListener(this); //监视鼠标右击菜单”复制“popupmenu.add(menuitem1_copy);menuitem1_paste=new JMenuItem("粘贴");menuitem1_paste.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_V,InputEvent.CTRL_MASK));menuitem1_paste.addActionListener(this); //监视鼠标右击菜单”粘贴“popupmenu.add(menuitem1_paste);ta1.add(popupmenu);con.validate();validate();}//---------------------------------------功能区------------------------------------public void actionPerformed(ActionEvent e){if(e.getSource()==menuitem_about){JOptionPane.showMessageDialog(null,"这是一个模仿win7的计算器!欢迎改进,\n创作者:钟作明","仿win7计算器",RMATION_MESSAGE);}if(e.getSource()==menuitem1_copy){ta1.selectAll();ta1.copy();}else if(e.getSource()==menuitem1_paste){ta1.setEditable(true);ta1.setText("");ta1.paste();ta1.setEditable(false);}else if(e.getSource()==menuitem_copy){ta1.selectAll();ta1.copy();}else if(e.getSource()==menuitem_paste){ta1.setEditable(true);ta1.setText("");ta1.paste();ta1.setEditable(false);}else if(e.getSource()==menuitem_exit){System.exit(0);}else if(e.getSource()==b_ce){ta1.setEditable(true);ta1.setText("0");ta1.setEditable(false);}else if(e.getSource()==b_c){ta1.setEditable(true);ta1.setText("0");ta1.setEditable(false);}else if(e.getSource()==b_tui){String str=ta1.getText();StringBuffer s=new StringBuffer(str);int L=s.length();try{if(L!=1){s=s.deleteCharAt(L-1);}else{s=new StringBuffer("0");}}catch(Exception e1){}ta1.setText(String.valueOf(s));}//---------------------------------------------数字键----------------------------- if(e.getSource()==b_1){addString(1);}else if(e.getSource()==b_2){addString(2);}else if(e.getSource()==b_3){addString(3);}else if(e.getSource()==b_4){addString(4);}else if(e.getSource()==b_5){addString(5);}else if(e.getSource()==b_6){addString(6);}else if(e.getSource()==b_7){addString(7);}else if(e.getSource()==b_8){addString(8);}else if(e.getSource()==b_9){addString(9);}else if(e.getSource()==b_0){addString(0);}else if(e.getSource()==b_dian){StringBuffer s1=new StringBuffer(ta1.getText());StringBuffer dian=new StringBuffer(".");if(String.valueOf(s1).indexOf(".")==-1){s1.append(dian);}ta1.setText(String.valueOf(s1));}else if(e.getSource()==b_jj){String txt=ta1.getText();int result=Integer.parseInt(txt);if(txt.indexOf("-")==-1&&txt.length()>0){if(result!=0){txt="-"+txt;}}else{StringBuffer txt1=new StringBuffer(txt);txt1=txt1.deleteCharAt(0);txt=String.valueOf(txt1);}ta1.setText(txt);}else if(e.getSource()==b_dui){str=ta1.getText();Double d=Double.parseDouble(str);if(d>=0){double d1=Math.sqrt(d);String s = String.valueOf(d1);if(s.endsWith(".0")==true){int z=(int)d1;str=String.valueOf(z);}else{str=String.valueOf(d1);}ta1.setText(str);}else{JOptionPane.showMessageDialog(null,"根号底数不能为负数","提醒", RMATION_MESSAGE);}end=true;}else if(e.getSource()==b_baifenhao){str=ta1.getText();Double d=Double.parseDouble(str);ta1.setText(""+d/100);end=true;}else if(e.getSource()==b_daoshu){str=ta1.getText();Double d=Double.parseDouble(str);if(d!=0){ta1.setText(""+1/d);}else{JOptionPane.showMessageDialog(null,"除数不能为零","提醒", RMATION_MESSAGE);}end=true;}else if(e.getSource()==b_jia){str = ta1.getText();op1 = Double.parseDouble(str);end=true;x=0;opall=op1;flagop2=false;}else if(e.getSource()==b_jian){str = ta1.getText();op1 = Double.parseDouble(str);end=true;x=1;opall=op1;flagop2=false;}else if(e.getSource()==b_cheng){str = ta1.getText();op1 = Double.parseDouble(str);end=true;x=2;opall=op1;flagop2=false;}else if(e.getSource()==b_chu){str = ta1.getText();op1 = Double.parseDouble(str);end=true;x=3;opall=op1;flagop2=false;}else if(e.getSource()==b_dengyu){str = ta1.getText();if(flagop2==false){op2 = Double.parseDouble(str);flagop2=true;}switch(x){case 0 :opall=opall+op2;String s=String.valueOf(opall);if(s.endsWith(".0")==true){result2=(int)opall;resultstr=String.valueOf(result2);}else{resultstr=String.valueOf(opall);}ta1.setText(resultstr);break;case 1 :opall=opall-op2;s=String.valueOf(opall);if(s.endsWith(".0")==true){result2=(int)opall;resultstr=String.valueOf(result2);}else{resultstr=String.valueOf(opall);}ta1.setText(resultstr);break;case 2 :opall=opall*op2;s=String.valueOf(opall);if(s.endsWith(".0")==true){result2=(int)opall;resultstr=String.valueOf(result2);}else{resultstr=String.valueOf(opall);}ta1.setText(resultstr);break;case 3 :opall=opall/op2;s=String.valueOf(opall);if(s.endsWith(".0")==true){result2=(int)opall;resultstr=String.valueOf(result2);}else{resultstr=String.valueOf(opall);}ta1.setText(resultstr);break;}end=true;}}public void addString(int num){String s=null;s=String.valueOf(num);//如果end==true;,那么屏幕清空if(end==true){ta1.setText("0");end=false;}if((ta1.getText()).equals("0")){ta1.setText(s);}else{if(ta1.getText().length()<21){str=ta1.getText()+s;ta1.setText(str);}}}public void mouseClicked(MouseEvent mec){if(mec.getModifiers()==mec.BUTTON3_MASK){popupmenu.show(ta1,mec.getX(),mec.getY());}}public void mousePressed(MouseEvent ms){}public void mouseReleased(MouseEvent md){}public void mouseEntered(MouseEvent ms){}public void mouseExited(MouseEvent mex){}public void mouseDragged(MouseEvent med){}}public class Calculator {public static void main(String[] args) {// TODO Auto-generated method stubCal jishuanji=new Cal("计算器");}}。
java计算器代码
计算器不单单是练习如何布局,更重要的是如何实现复杂的运算逻辑。
新手编写计算器,无疑会用到大量的 if-else。
而熟练的开发人员知道如何避开这点。
下面是代码。
[java] view plaincopyprint?import javax.swing.*;import javax.swing.border.Border;import java.awt.*;import java.awt.event.ActionListener;import java.awt.event.ActionEvent;import java.math.BigDecimal;import java.math.RoundingMode;import java.util.HashMap;/*** 我的计算器。
MyCalculator 继承于 JFrame,是计算器的界面*/public class MyCalculator extends JFrame {private Border border = BorderFactory.createEmptyBorder(5, 5, 5, 5);private JTextField textbox = new JTextField("0");private CalculatorCore core = new CalculatorCore();private ActionListener listener = new ActionListener() {public void actionPerformed(ActionEvent e) {JButton b = (JButton) e.getSource();String label = b.getText();String result = core.process(label);textbox.setText(result);}};public MyCalculator(String title) throws HeadlessException {super(title); // 调用父类构造方法setupFrame(); // 调整窗体属性setupControls(); // 创建控件}private void setupControls() {setupDisplayPanel(); // 创建文本面板setupButtonsPanel(); // 创建按钮面板}// 创建按钮面板并添加按钮private void setupButtonsPanel() {JPanel panel = new JPanel();panel.setBorder(border);panel.setLayout(new GridLayout(4, 5, 3, 3));createButtons(panel, new String[]{"7", "8", "9", "+", "C","4", "5", "6", "-", "CE","1", "2", "3", "*", "", // 空字符串表示这个位置没有按钮 "0", ".", "=", "/", ""});this.add(panel, BorderLayout.CENTER);}/*** 在指定的面板上创建按钮** @param panel 要创建按钮的面板* @param labels 按钮文字*/private void createButtons(JPanel panel, String[] labels) {for (String label : labels) {// 如果 label 为空,则表示创建一个空面板。
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("+/-");。
基于java的简易计算器的设计
基于java的简易计算器的设计摘要自从java语言诞生以来,java语言就以不可抵挡的趋势很快成为国际上广泛流行的面向对象编程语言,它既具有高级语言的特点,又少了C语言中指针特点,因而变得简单了很多。
Java是一种可以撰写跨平台应用软件的面向对象的程序设计语言,其具有卓越的通用性、高效性、平台移植性和安全性,广泛应用于个人PC、数据中心、游戏控制台、科学超级计算机、移动电话和互联网,同时拥有全球最大的开发者专业社群。
在全球云计算和移动互联网的产业环境下,Java更具备了显著优势和广阔前景。
本文介绍了用java语言编写一个简易计算器。
实现数学上的加、减、乘、除、乘方、开方、阶乘、正弦、余弦运算等相关运算。
利用这个程序可以方便的进行日常性的小规模运算,小巧简易,是个实用的工具。
关键词:程序设计;简易计算器;java语言THE DESIGN OF SIMPLE CALCULATOR BASED ON JA V AABSTRACTSince the inception of the java language, java language Take irresistible trend soon beca me widespread international popular object-oriented programming language, both with advan ced language features, and less of the C language pointer characteristics, and thus becomes a l ot simpler . Java is a cross-platform application software can write object-oriented programmi ng language, which has excellent versatility, efficiency, platform portability, and security, are widely used in personal PC, data center, gaming consoles, scientific super-computers, mobile phones and the Internet, also has the world's largest developer of professional community. In t he global cloud computing and mobile Internet industry environment, Java and more have sig nificant advantages and broad prospects.This article describes the use java language a simple calculator. Achieve mathematical addition, subtraction, multiplication, division, involution, evolution, factorial, sine, cosine op erations and other related operations. With this program you can easily carry out daily operati ons of small-scale, small simple, is a useful tool.Key words:program design;simple calculator;java language目录1前言 (1)1.1 课程设计背景 (1)1.2 需求环境 (1)1.3 课程设计思路 (1)2课程设计概要 (2)3 计算器详细设计 (3)3.1 计算器界面……….………….........………………………………………. .33.1.1 CAL主类的显示分布 (3)3.1.2计算器显示界面实现代码 (3)3.2 监听各个按钮的类 (5)3.2.1 编写监听类目的 (5)3.2.2 监听类实现代码 (5)3.3 按键响应类 (7)3.3.1 响应类编写的目的 (7)3.2.2 响应类实现代码 (7)3.3 运算处理类 (9)3.3.1 处理方式 . (9)3.2.2 处理类实现代码 (9)4 运行与调试 (12)4.1 进入程序主界面 (12)4.2 加减乘除功能实现 (12)4.3 正余弦、正切功能实现 (13)4.4 阶乘功能实现 (13)4.5 乘方、开方功能实现 (14)5 实验总结 (15)参考文献 (16)附录:源代码 (17)1 前言1.1 课程设计背景日常生活中我们经常会遇到一些小型数据计算的问题,本课程设计就是以此为出发点,设计了这样一个简单的计算器,用以实现基本的数学运算。
eclipse实现简单计算器代码.
eclipse实现简单计算器代码.package Computer;import java.awt.*;import java.awt.event.*;import javax.swing.*;import javax.swing.border.*;import java.util.LinkedList;import java.text.NumberFormat;public class Cacultor extends Frame implements ActionListener{/*** @param args*/NumberButton numberButton[];OperationButton operationButton[];Button 小数点按钮,正负号按钮,退格按钮,求倒数按钮,等号按钮,清零按钮;Panel panel;JTextField resultShow;String 运算符号[]={"+","-","*","/"};LinkedList 链表;boolean 是否按下等号=false;public Cacultor(){super("计算器");链表=new LinkedList();numberButton=new NumberButton[10];for(int i=0;i<=9;i++){numberButton[i]=new NumberButton(i);numberButton[i].addActionListener(this);}operationButton=new OperationButton[4];for(int i=0;i<4;i++){operationButton[i]=new OperationButton(运算符号[i]);operationButton[i].addActionListener(this);}小数点按钮=new Button(".");正负号按钮=new Button("+/-");等号按钮=new Button("=");求倒数按钮=new Button("1/x");退格按钮=new Button("退格");清零按钮=new Button("c");清零按钮.setForeground(Color.red);退格按钮.setForeground(Color.red);等号按钮.setForeground(Color.red);求倒数按钮.setForeground(Color.blue);正负号按钮.setForeground(Color.blue);小数点按钮.setForeground(Color.blue);退格按钮.addActionListener(this);清零按钮.addActionListener(this);等号按钮.addActionListener(this);小数点按钮.addActionListener(this);正负号按钮.addActionListener(this);求倒数按钮.addActionListener(this);resultShow=new JTextField(10);resultShow.setHorizontalAlignment(JTextField.RIGHT); resultShow.setForeground(Color.blue);resultShow.setFont(new Font("TimesRoman",Font.PLAIN,14)); resultShow.setBorder(newSoftBevelBorder(BevelBorder.LOWERED));resultShow.setBackground(Color.white);resultShow.setEditable(false);panel=new Panel();panel.setLayout(new GridLayout(4,5));panel.add(numberButton[1]);panel.add(numberButton[2]);panel.add(numberButton[3]);panel.add(operationButton[0]);panel.add(清零按钮);panel.add(numberButton[4]);panel.add(numberButton[5]);panel.add(numberButton[6]);panel.add(operationButton[1]);panel.add(退格按钮);panel.add(numberButton[7]);panel.add(numberButton[8]);panel.add(numberButton[9]);panel.add(operationButton[2]);panel.add(求倒数按钮);panel.add(numberButton[0]);panel.add(正负号按钮);panel.add(小数点按钮);panel.add(operationButton[3]);panel.add(等号按钮);add(panel,BorderLayout.CENTER);add(resultShow,BorderLayout.NORTH);addWindowListener(new WindowAdapter(){public void windowClosing(WindowEvent e){ System.exit(0);}});setVisible(true);setBounds(100,50,240,180);setResizable(false);validate();}//按钮事件的处理public void actionPerformed(ActionEvent e){if(e.getSource() instanceof NumberButton){NumberButton b=(NumberButton)e.getSource();if(链表.size()==0){int number=b.getNumber();链表.add(""+number);resultShow.setText(""+number);是否按下等号=false;}else if(链表.size()==1&&是否按下等号==false){ int number=b.getNumber();String num=(String)链表.getFirst();String s=num.concat(""+number);链表.set(0, s);resultShow.setText(s);}else if(链表.size()==1&&是否按下等号==true){int number=b.getNumber();链表.removeFirst();链表.add(""+number);是否按下等号=false;resultShow.setText(""+number);}else if(链表.size()==2){int number=b.getNumber();链表.add(""+number);resultShow.setText(""+number);}else if(链表.size()==3){int number=b.getNumber();String num=(String)链表.getLast();String s=num.concat(""+number);链表.set(2, s);resultShow.setText(s);}}else if(e.getSource()instanceof OperationButton){ OperationButton b=(OperationButton)e.getSource();if(链表.size()==1){String fuhao=b.get运算符号();链表.add(fuhao);}else if(链表.size()==2){String fuhao=b.get运算符号();链表.set(1, fuhao);}else if(链表.size()==3){String fuhao=b.get运算符号();String number1=(String)链表.getFirst();String number2=(String)链表.getLast();String 运算符号=(String)链表.get(1);try{double n2=Double.parseDouble(number2); double n=0;if(运算符号.equals("+")){n=n1+n2;}else if(运算符号.equals("-")){n=n1-n2;}else if(运算符号.equals("*")){n=n1*n2;}else if(运算符号.equals("/")){n=n1/n2;}链表.clear();链表.add(""+n);链表.add(fuhao);resultShow.setText(""+n);}catch(Exception ee){}}}else if(e.getSource()==等号按钮){是否按下等号=true;if(链表.size()==1&&链表.size()==2){ String num=(String)链表.getFirst(); resultShow.setText(""+num);}else if(链表.size()==3){String number1=(String)链表.getFirst(); String number2=(String)链表.getLast(); String 运算符号=(String)链表.get(1);try{double n2=Double.parseDouble(number2); double n=0;if(运算符号.equals("+")){n=n1+n2;}else if(运算符号.equals("-")){n=n1-n2;}else if(运算符号.equals("*")){n=n1*n2;}else if(运算符号.equals("/")){n=n1/n2;}resultShow.setText(""+n);链表.set(0, ""+n);链表.removeLast();链表.removeLast();}catch(Exception ee){}}}else if(e.getSource()==小数点按钮){if(链表.size()==0){是否按下等号=false;}else if(链表.size()==1){String dot=小数点按钮.getLabel();String num=(String)链表.getFirst();String s=null;if(num.indexOf(dot)==-1){s=num.concat(dot);链表.set(0, s);}else{s=num;}链表.set(0, s);resultShow.setText(s);}else if(链表.size()==3){String dot=小数点按钮.getLabel(); String num=(String)链表.getLast(); String s=null;if(num.indexOf(dot)==-1){s=num.concat(dot);链表.set(2, s);}else{s=num;}resultShow.setText(s);}}else if(e.getSource()==退格按钮){if(链表.size()==1){String num=(String)链表.getFirst();if(num.length()>=1){num=num.substring(0,num.length()-1); 链表.set(0, num);resultShow.setText(num);}else{链表.removeLast();resultShow.setText("0");}}else if(链表.size()==3){String num=(String)链表.getLast();if(num.length()>=1){num=num.substring(0,num.length()-1); 链表.set(2, num);resultShow.setText(num);}else{链表.removeLast();resultShow.setText("0");}}}else if(e.getSource()==正负号按钮){if(链表.size()==1){String number1=(String)链表.getFirst(); try{double d=Double.parseDouble(number1); d=-1*d;String str=String.valueOf(d);链表.set(0, str);resultShow.setText(str);}catch(Exception ee){}}else if(链表.size()==3){String number2=(String)链表.getLast();try{double d=Double.parseDouble(number2); d=-1*d;String str=String.valueOf(d);链表.set(2, str);resultShow.setText(str);}catch(Exception ee){}}}else if(e.getSource()==求倒数按钮){if(链表.size()==1||链表.size()==2){String number1=(String)链表.getFirst(); try{double d=Double.parseDouble(number1); d=1.0/d;String str=String.valueOf(d);链表.set(0, str);resultShow.setText(str);}catch(Exception ee){}}else if(链表.size()==3){String number2=(String)链表.getLast();try{double d=Double.parseDouble(number2); d=1.0/d;String str=String.valueOf(d);链表.set(0, str);resultShow.setText(str);}catch(Exception ee){}}}else if(e.getSource()==清零按钮){是否按下等号=false;resultShow.setText("0");链表.clear();}}public static void main(String[] args) {// TODO Auto-generated method stub new Cacultor();}}。
计算器的源代码
package class4;import javax.swing.*;import java.awt.event.*;import java.awt.GridLayout;publicclass Shixun extends JFrame implements ActionListener,ItemListener {JTextField jt = new JTextField(16) ;//计算器界面布置JButton b1 = new JButton("1") ;JButton b2 = new JButton("2") ;JButton b3 = new JButton("3") ;JButton b4 = new JButton("4") ;JButton b5 = new JButton("5") ;JButton b6 = new JButton("6") ;JButton b7 = new JButton("7") ;JButton b8 = new JButton("8") ;JButton b9 = new JButton("9") ;JButton b0 = new JButton("0") ;JButton b10 = new JButton ("/") ;JButton b11 = new JButton ("+") ;JButton b12 = new JButton ("-") ;JButton b13 = new JButton ("*") ;JButton b14 = new JButton ("=") ;JButton b15 = new JButton (".") ;JButton b16 = new JButton ("%") ;JButton b17 = new JButton ("c") ;JButton b18 = new JButton ("←") ;JButton b19 = new JButton ("√") ;/*JButton b20 = new JButton ("±") ;JButton b21 = new JButton ("(") ;JButton b22 = new JButton (")") ;JButton b23 = new JButton ("π") ;*/int index=0;boolean flag = true ;//第一次输入double sum = 0.0 ;//初始结果为0String str = "1234567890.*/+-%=√";Shixun(){setTitle ("计算器") ;setSize(210,205) ;setResizable(true) ;setVisible(true) ;setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE) ;//设置关闭窗体GridLayout pl = new GridLayout(5,4,0,1) ;JPanel p = new JPanel () ;p.setLayout(pl) ;//将按钮组件添加到面板容器中p.add(b17) ;p.add(b18);p.add(b10);p.add(b13);p.add(b7) ;p.add(b8) ;p.add(b9) ;p.add(b12);p.add(b4) ;p.add(b5) ;p.add(b6) ;p.add(b11) ;p.add(b1) ;p.add(b2) ;p.add(b3) ;p.add(b16);p.add(b19);p.add(b0) ;p.add(b15) ;p.add(b14) ;/* p.add(b20);p.add(b21);p.add(b22);p.add(b23);*/add(p,"South");add(jt,"North");//设置监听器b0.addActionListener(this) ;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) ;b10.addActionListener(this) ;b11.addActionListener(this) ;b12.addActionListener(this) ;b13.addActionListener(this) ;b14.addActionListener(this) ;b15.addActionListener(this) ;b16.addActionListener(this) ;b17.addActionListener(this) ;b18.addActionListener(this) ;b19.addActionListener(this) ; /* b20.addActionListener(this) ;b21.addActionListener(this) ;b22.addActionListener(this) ;b23.addActionListener(this) ;*/ }publicstaticvoid main(String[] args) {new Shixun() ;}publicvoid actionPerformed(ActionEvent e) {String s = e.getActionCommand() ;// String s1;if(s.equals("←")){String t = jt.getText() ;int l = t.length() ;t = t.substring(0, l-1) ;jt.setText(t) ;index=0;}elseif('0'<=s.charAt(0)&&s.charAt(0)<='9'|| e.getSource()==b15 ){ if(flag)jt.setText(s);elseif(e.getSource() == b15 ){index++;if(index>= 2){JOptionPane.showMessageDialog(null,"您的输入有误,请重新输入","系统消息:",RMATION_MESSAGE);jt.setText(jt.getText()) ;}else {jt.setText(jt.getText()+s) ;}}else {jt.setText(jt.getText()+s) ;index=0;}flag = false ;//非第一次输入}elseif(s.equals("c")){sum=0;jt.setText("") ;index=0;}else {double x = Double.parseDouble(jt.getText()) ;if(str.equals("+")) sum +=x;if(str.equals("-")) sum -=x;if(str.equals("/")) sum /=x;if(str.equals("*")) sum *=x;if(str.equals("=")) sum =x;if(str.equals("%")) sum %=x;if(str.equals("√")) sum =Math.sqrt(x) ;if(str.equals(".")) sum =x;jt.setText(""+sum) ;str = s ;flag=true ;}}@Overridepublicvoid itemStateChanged(ItemEvent e) { // TODO Auto-generated method stub}}。
北邮JAVA第三次作业科学计算器(附源代码)
北邮JAVA第三次作业科学计算器(附源代码)JAVA第三次作业选题:科学计算器一、设计思路(1)布局1.数字键盘有0~9和小数点2.符号键盘有+某÷,幂,开方,lg,ln3.功能按键有清屏(AC)和删除(Del)(2)计算器流程状态转移图设定的标志位和变量有:booleannumflag=fale;//标志:是否输入数字booleanopflag=fale;//标志:是否输入运算操作符Stringt某t=null;//显示到文本框里的字符串Stringnum_t某t=\;//当前操作数的字符串形式Stringop=\;//存放输入的运算操作符num1=0;//第一个操作数num2=0;//第二个操作数privateBigDecimalbig_num1=newBigDecimal(Double.toString(0)); //解决浮点数的精度丢失问题privateBigDecimalbig_num2=newBigDecimal(Double.toString(0));1.关于操作数操作数为输入数字时会改变的数,有num1和num2。
按下运算符和控制字符,会设定当前下在键入的操作数,由opflag控制,fale表示正在操作num1,true表示正在操作num2。
初始状态下的操作数为num1。
按下AC会恢复操作数为初始状态num1。
按Delete、开方、lg、ln不会改变当前的操作数。
其中后三者只对num1有效。
其他的运算符和控制符都会使操作数为num2。
2.计算器的状态框图输入第一个数,比如53numflag=true(num1)opflag=falenum_t某t=”53”op=””t某t=”53”初始状态numflag=faleopflag=falenum_t某t=””op=””t某t=nullnum1,num2=0按下一个运算符,比如+numflag=faleopflag=truenum_t某t=””op=”+”t某t=”num1+”其中按下按=显示结果,恢复初始状态numflag=true(num1)opflag=falenum_t某t=””op=””t某t=”reult”“=”后,结果存输入第二个数,比如66入numflag=true(num2)opflag=truenum_t某t=”66”op=””t某t=”num1+66”num1,继续输入数字会在num1的结果上处理。
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。
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简单编程例子
java简单编程例子以下是十个以Java编写的简单编程例子:1. 计算两个整数的和```javapublic class SumCalculator {public static void main(String[] args) {int num1 = 10;int num2 = 5;int sum = num1 + num2;System.out.println("两个整数的和为:" + sum); }}```2. 判断一个数是否为偶数```javapublic class EvenNumberChecker {public static void main(String[] args) {int num = 6;if (num % 2 == 0) {System.out.println(num + "是偶数");} else {System.out.println(num + "不是偶数");}}}```3. 打印九九乘法表```javapublic class MultiplicationTable {public static void main(String[] args) {for (int i = 1; i <= 9; i++) {for (int j = 1; j <= i; j++) {System.out.print(j + " × " + i + " = " + (i * j) + "\t");}System.out.println();}}}```4. 计算一个数的阶乘```javapublic class FactorialCalculator {public static void main(String[] args) {int num = 5;int factorial = 1;for (int i = 1; i <= num; i++) {factorial *= i;}System.out.println(num + "的阶乘为:" + factorial); }}```5. 判断一个字符串是否为回文串```javapublic class PalindromeChecker {public static void main(String[] args) {String str = "level";boolean isPalindrome = true;for (int i = 0; i < str.length() / 2; i++) {if (str.charAt(i) != str.charAt(str.length() - 1 - i)) {isPalindrome = false;break;}}if (isPalindrome) {System.out.println(str + "是回文串");} else {System.out.println(str + "不是回文串");}}}```6. 求一个整数数组的平均值```javapublic class AverageCalculator {public static void main(String[] args) {int[] array = {5, 8, 12, 3, 10};int sum = 0;for (int num : array) {sum += num;}double average = (double) sum / array.length;System.out.println("数组的平均值为:" + average); }}```7. 将一个字符串反转```javapublic class StringReverser {public static void main(String[] args) {String str = "Hello World";StringBuilder reversedStr = new StringBuilder();for (int i = str.length() - 1; i >= 0; i--) {reversedStr.append(str.charAt(i));}System.out.println("反转后的字符串为:" + reversedStr.toString());}}```8. 判断一个年份是否为闰年```javapublic class LeapYearChecker {public static void main(String[] args) {int year = 2020;if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0) {System.out.println(year + "年是闰年");} else {System.out.println(year + "年不是闰年");}}}```9. 打印斐波那契数列前n项```javapublic class FibonacciSeries {public static void main(String[] args) {int n = 10;int[] fibonacci = new int[n];fibonacci[0] = 0;fibonacci[1] = 1;for (int i = 2; i < n; i++) {fibonacci[i] = fibonacci[i - 1] + fibonacci[i - 2];}System.out.println("前" + n + "项斐波那契数列为:");for (int num : fibonacci) {System.out.print(num + " ");}}}```10. 判断一个数是否为质数```javapublic class PrimeNumberChecker {public static void main(String[] args) {int num = 17;boolean isPrime = true;if (num <= 1) {isPrime = false;} else {for (int i = 2; i <= Math.sqrt(num); i++) { if (num % i == 0) {isPrime = false;break;}}}if (isPrime) {System.out.println(num + "是质数");} else {System.out.println(num + "不是质数");}}}```以上是十个简单的Java编程例子,涵盖了常见的数学运算、字符串处理、数组操作等基础知识点。
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。
Java程序设计计算器含代码设计
Java程序课程设计任务书实用性计算器的设计与开发1、主要内容:开发一个实用型的计算器程序,实现基本的计算功能同时并进行相应的功能拓展,使其具更加人性化的功能。
我们可以用其进行相应的计算功能来方便我们的学习,代替我们进行一些简单的脑力劳动。
2、具体要求(包括技术要求等):系统的功能要求:1.可以使用计算器进行简单的四则运算:用界面上的按钮输入数字和相应的运算符,即可算出相应的式子的答案,并且确保答案符合一定的精度要求;2.可以使用计算器进行一定的科学运算,比如在输入数字后,计算器可以将相应的数字进行进制转化,实现功能的同时确保一定的精度要求;3.可以进行简单的函数运算,比如求一个数的三角函数等;4.具有一定的错误提示功能,比如输入一个数除以0,我们将输出错误的信息。
学习并掌握以下技术:Javax.swing,AWT,事件处理等熟练使用以下开发工具:Eclipse实现系统上述的功能。
3、进度安排:12月28日~ 12月29日:课程设计选题,查找参考资料12月30日~ 12月31日:完成需求分析1月1日~ 1月5日:完成系统设计,完成程序代码的编写1月6日~ 1月6日:系统测试与完善1月7日~ 1月8日:完成课程设计报告,准备答辩四、主要参考文献[1] 耿祥义. JA V A课程设计[M]. 北京:清华大学出版社,2008年11月.[2] 张广彬, 孟红蕊, 张永宝. Java课程设计案例精编[M]. 北京:清华大学出版社,2007年.[3] 杨树林,胡洁萍. JA V A语言最新实用案例教程[M]. 北京:清华大学出版社,2006年1月. 45-170[4] 刘新Java开发技术大全北京[M].清华大学出版社2009年11月.[5] 黄明, 梁旭, 周绍斌编著. Java课程设计[M] 北京:电子工业出版社, 2006年目录JA V A程序课程设计任务书 (I)目录 (III)第1章引言 (1)1.1背景 (1)1.2课程设计内容 (1)1.3任务分工 (2)第2章实用型计算器的设计 (3)2.1需求分析 (3)2.2开发及运行环境 (3)2.3主要功能要求 (4)2.4系统模块化分析 (4)2.4.1 计算器主界面布局 (4)2.4.2实用型计算器各模块介绍 (7)2.5本章小结 (7)第3章计算器的具体实现 (8)3.1界面设计 (8)3.1.1用户登陆界面图 (8)3.1.2注册用户界面 (10)3.1.3 系统主界面 (12)3.1.4历史记录界面 (14)3.1.5 用户信息界面 (15)3.2程序设计及调试运行 (15)3.3本章小结 (32)第4章结束语 (33)致谢 (33)参考文献 (34)附录源代码 (34)第1章引言1.1 背景Java不依赖平台的特点使它受到广泛的关注,Java已成为网络时代最重要的语言之一。
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import java.awt.*;import java.awt.event.*;import javax.swing.*;import java.util.Vector;public class Tuo{String str1="0"; //运算数1 初值一定为0 为了程序的安全String str2="0"; //运算数2String fh="+"; //运算符String jg="";//结果//状态开关重要int k1=1;//开关1 用于选择输入方向将要写入str2或 str2int k2=1;//开关2 符号键次数 k2>1说明进行的是2+3-9+8 这样的多符号运算int k3=1;//开关3 str1 是否可以被清0 ==1时可以 !=1时不能被清0int k4=1;//开关4 str2 同上int k5=1;//开关5 控制小数点可否被录入 ==1时可以 !=1 输入的小数点被丢掉 JButton jicunqi; //寄存器记录是否连续按下符号键Vector vt=new Vector(20,10);JFrame frame=new JFrame("sunshine---计算器");JTextField jg_TextField=new JTextField(jg,20);//20列JButton clear_Button=new JButton("清除");JButton button0=new JButton("0");JButton button1=new JButton("1");JButton button2=new JButton("2");JButton button3=new JButton("3");JButton button4=new JButton("4");JButton button5=new JButton("5");JButton button6=new JButton("6");JButton button7=new JButton("7");JButton button8=new JButton("8");JButton button9=new JButton("9");JButton button_Dian=new JButton(".");JButton button_jia=new JButton("+");JButton button_jian=new JButton("-");JButton button_cheng=new JButton("*");JButton button_chu=new JButton("/");JButton button_dy=new JButton("=");//////////////////////////////////////////////////////////////////////// public static void main(String[] args){Tuo tuo=new Tuo();}///////////////////////////////////////////////////////////////////////// Tuo(){button0.setMnemonic(KeyEvent.VK_0);//等效键//其它等效键略,jg_TextField.setHorizontalAlignment(JTextField.RIGHT );//文本框右对齐JPanel pan=new JPanel();pan.setLayout(new GridLayout(4,4,5,5));//四行四列边距为5像素pan.add(button7);pan.add(button8);pan.add(button9);pan.add(button_chu);pan.add(button4);pan.add(button5);pan.add(button6);pan.add(button_cheng);pan.add(button1);pan.add(button2);pan.add(button3);pan.add(button_jian);pan.add(button0);pan.add(button_Dian);pan.add(button_dy);pan.add(button_jia);pan.setBorder(BorderFactory.createEmptyBorder(5,5,5,5));//pan对象的边距JPanel pan2=new JPanel();pan2.add(jg_TextField);JPanel pan3=new JPanel(); //为什么要多此一句呢?因为我不会设置按钮的大小 pan3.setLayout(new FlowLayout());pan3.add(clear_Button);//clear_Button.setSize(10,10);//设置清零按钮的大小吗的不好使!!frame.setLocation(300, 200); //主窗口出现在位置frame.setResizable(false); //不能调大小frame.getContentPane().setLayout(new BorderLayout()); frame.getContentPane().add(pan2,BorderLayout.NORTH); frame.getContentPane().add(pan,BorderLayout.CENTER); frame.getContentPane().add(pan3,BorderLayout.SOUTH);frame.pack();frame.setVisible(true);//以上是控件和布局//下面是事件处理程序//--------------- 数字键 ----------------class JianTing implements ActionListener{public void actionPerformed(ActionEvent e){String ss=((JButton)e.getSource()).getText();jicunqi=(JButton)e.getSource();vt.add(jicunqi);if (k1==1){if(k3==1){str1="";k5=1;//还原开关k5状态}str1=str1+ss;//k2=1;k3=k3+1;//System.out.println(str1);jg_TextField.setText(str1);//显示}else if(k1==2){if (k4==1){str2="";k5=1; //还原开关k5状态}str2=str2+ss;//k2=2;///////////////测试////////////////jg_TextField.setText(str2);}}}//--------符号-----------class JianTing_fh implements ActionListener{public void actionPerformed(ActionEvent e){String ss2=((JButton)e.getSource()).getText();jicunqi=(JButton)e.getSource();vt.add(jicunqi);if(k2==1){k1=2;//开关 k1 为1时,向数1写为2时,向数2写k5=1;fh=ss2;k2=k2+1;//按符号键的次数}else{int a=vt.size();JButton c=(JButton)vt.get(a-2);if(!(c.getText().equals("+"))&&!(c.getText().equals("-"))&&!(c.getText().equals ("*"))&&!(c.getText().equals("/")))//if(!(vt.get(a-2).getText().equals("-"))||!(vt.get(a-2).getText().equals("+")) ||!(vt.get(a-2).getText().equals("*"))||!(vt.get(a-2).getText().equals("/"))) { yuns();str1=jg;k1=2;//开关 k1 为1时,向数1写为2时,向数2写k5=1;k4=1;fh=ss2;}}}//--------清除-------class JianTing_clear implements ActionListener {public void actionPerformed(ActionEvent e){jicunqi=(JButton)e.getSource();vt.add(jicunqi);k5=1;k2=1;k1=1;k3=1;k4=1;str1="0";str2="0";fh="";jg="";jg_TextField.setText(jg);vt.clear();}}//----------------等于 --------------------- class JianTing_dy implements ActionListener{public void actionPerformed(ActionEvent e){jicunqi=(JButton)e.getSource();vt.add(jicunqi);yuns();k1=1; //还原开关k1状态//str1=jg;k2=1;k3=1;//还原开关k3状态k4=1; //还原开关k4状态str1=jg; //为7+5=12 +5=17 这种计算做准备}//----------------小数点 ---------------------class JianTing_xiaos implements ActionListener{public void actionPerformed(ActionEvent e){jicunqi=(JButton)e.getSource();vt.add(jicunqi);if(k5==1){String ss2=((JButton)e.getSource()).getText(); if (k1==1){if(k3==1){str1="";k5=1; //还原开关k5状态}str1=str1+ss2;//k2=1;k3=k3+1;//System.out.println(str1);jg_TextField.setText(str1);//显示}else if(k1==2){if (k4==1){str2="";k5=1; //还原开关k5状态}str2=str2+ss2;//k2=2;k4=k4+1;///////////////测试////////////////jg_TextField.setText(str2);}}k5=k5+1; //}//注册监听器JianTing_dy jt_dy=new JianTing_dy();JianTing jt= new JianTing();//临听数字键JianTing_fh jt_fh= new JianTing_fh();//临听符号键JianTing_clear jt_c=new JianTing_clear(); //清除键JianTing_xiaos jt_xs=new JianTing_xiaos();// 小数点键button7.addActionListener(jt);button8.addActionListener(jt);button9.addActionListener(jt);button_chu.addActionListener(jt_fh);button4.addActionListener(jt);button5.addActionListener(jt);button6.addActionListener(jt);button_cheng.addActionListener(jt_fh);button1.addActionListener(jt);button2.addActionListener(jt);button3.addActionListener(jt);button_jian.addActionListener(jt_fh);button0.addActionListener(jt);button_Dian.addActionListener(jt_xs);button_dy.addActionListener(jt_dy);button_jia.addActionListener(jt_fh);clear_Button.addActionListener(jt_c);//关闭事件处理程序frame.addWindowListener(new WindowAdapter(){public void windowClosing(WindowEvent e){System.exit(0);}});}//---------------计算------------------public void yuns(){double a2;//运算数1double b2;//运算数2String c=fh;// 运算符double jg2=0 ;//结果if (c.equals("")){//System.out.println("请输入运算符");jg_TextField.setText("请输入运算符");}else{System.out.println("str1:"+str1);//调试时使用System.out.println("str2:"+str2);//调试时使用System.out.println("运算符:"+fh);//调试时使用if (str1.equals(".")) //字符串 "." 转换成double型数据时会出错所以手工转 str1="0.0";if (str2.equals("."))str2="0.0";a2=Double.valueOf(str1).doubleValue();b2=Double.valueOf(str2).doubleValue();System.out.println("double型的a2:"+a2); //调试时使用System.out.println("double型的b2:"+b2); //调试时使用if (c.equals("+")){jg2=a2+b2;}if (c.equals("-")){jg2=a2-b2;}if (c.equals("*")){jg2=a2*b2;}if (c.equals("/")){if(b2==0){jg2=0;//0000000000000 by 0 cu!}else{jg2=a2/b2;}}System.out.println("double型a2"+fh+"b2结果:"+jg2);System.out.println();jg=((new Double(jg2)).toString());jg_TextField.setText(jg);}}}。