Java计算器源代码

}
}
});
b9.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
if(flag==false){
tf.setText("9");
p= new JPanel();
b0=new JButton("0");
b1=new JButton("1");
b2=new JButton("2");
b3=new JButton("3");
b4=new JButton("4");
b5=new JButton("5");
sign='+';
flag=false;
}
});
sub.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
opera1=tf.getText();
if(flag==false){
tf.setText("4");
flag=true;
}
else{
tf.setText(tf.getText()+"4");
}
}
});
b5.addActionListener(new ActionListener(){
if(flag==false){
tf.setText("1");
flag=true;
}
else{
tf.setText(tf.getText()+"1");
}
}
});
b2.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent arg0) {
if(flag==false){
tf.setText("5");
flag=true;
}
else{
tf.setText(tf.getText()+"5");
public void actionPerformed(ActionEvent e){
if(flag==false){
tf.setText("8");
flag=true;
}
else{
tf.setText(tf.getText()+"8");
}
else{
tf.setText(tf.getText()+"0");
}
}
});
b1.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent arg0) {
JFrame f;
JTextField tf;
JPanel p;
JButton b0;
JButton b1;
JButton b2;
JButton b3;
JButton b4;
JButton b5;
JButton b6;
JButton b7;
JButton b8;
p.add(b0);
p.add(point);
p.add(equal);
p.add(div);
f.add(p);
f.setSize(220, 240);//设置大小
f.setLocation(420, 260);//设置位置
f.setVisible(true);
mul=new JButton("*");
div=new JButton("/");
equal=new JButton("=");
flag=false;
opera1="";
run();
}
public static void main(String[] args){//main函数
tf.setText(tf.getText()+".");
}
});
add.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
opera1=tf.getText();
sign='*';
flag=false;
}
});
div.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
opera1=tf.getText();
break;
case '-':
firstNum=Double.parseDouble(opera1);
secondNum=Double.parseDouble(tf.getText());
public void actionPerformed(ActionEvent arg0) {
if(flag==false){
tf.setText("2");
flag=true;
}
else{
tf.setText(tf.getText()+"2");
}
}
});
b3.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent arg0) {
if(flag==false){
tf.setText("3");
}
}
});
b6.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent arg0) {
if(flag==false){
tf.setText("6");
case '+':
firstNum=Double.parseDouble(opera1);
secondNum=Double.parseDouble(tf.getText());
result=firstNum+secondNum;
tf.setText(result+"");
JButton b9;
JButton point;
JButton add;
JButton sub;
JButton mul;
JButton div;
JButton equal;
boolean flag;
String opera1;
char sign;//符号：+-*/
flag=true;
}
else{
tf.setText(tf.getText()+"3");
}
}
});
b4.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent arg0) {
flag=true;
}
else{
tf.setText(tf.getText()+"6");
}
}
});
b7.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e) {
b0.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent arg0) {
if(flag==false){
tf.setText("0");
flag=true;
flag=true;
}
else{
tf.setText(tf.getText()+"9");
}
}
});
point.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
if(flag==false){
tf.setText("7");
flag=true;
}
else{
tf.setText(tf.getText()+"7");
}
}
});
b8.addActionListener(new ActionListener(){
b6=new JButton("6");