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给你找了一个，我试过，可以用

import java.awt.*;

import javax.swing.*;

import java.awt.event.*;

import javax.swing.*;//GUi之前要吧这两个都引进来32313133353236313431303231363533e59b9ee7ad9431333363373733

public class Computer extends JFrame implements ActionListener

{

JButton a1,a2,a3,a4,a5,a6,a7,a8,a9,a0;

JButton b1,b2,b3,b4;

JButton c1,c2,c3,c4;

JTextField t1,t2;

JPanel p1,p2;

JLabel bq1,bq2;

String fuhao;

Double count,count2;

boolean chose=false,cliks;

public static void main(String[] args){

Computer l = new Computer();

}

public Computer(){

Font font = new Font("宋体", Font.BOLD, 36);

Font font2 = new Font("宋体", Font.BOLD, 20);

a1 = new JButton("1");

a1.setFont(font);

a1.addActionListener(this);

a2 = new JButton("2");

a2.setFont(font);

a2.addActionListener(this);

a3 = new JButton("3");

a3.setFont(font);

a3.addActionListener(this);

a4 = new JButton("4");

a4.setFont(font);

a4.addActionListener(this);

a5 = new JButton("5");

a5.setFont(font);

a5.addActionListener(this);

a6 = new JButton("6");

a6.setFont(font);

a6.addActionListener(this);

a7 = new JButton("7");

a7.setFont(font);

a7.addActionListener(this);

a8 = new JButton("8");

a8.setFont(font);

a8.addActionListener(this);

a9 = new JButton("9");

a9.setFont(font);

a9.addActionListener(this);

a0 = new JButton("0");

a0.setFont(font);

a0.addActionListener(this);

b1 = new JButton("清空");

b1.addActionListener(this);

b2 = new JButton("返回");

b2.addActionListener(this);

b3 = new JButton(".");

b3.addActionListener(this);

b4 = new JButton("=");

b4.addActionListener(this);

c1 = new JButton("+");

c1.addActionListener(this);

c2 = new JButton("-");

c2.addActionListener(this);

c3 = new JButton("x");

c3.addActionListener(this);

c4 = new JButton("÷");

c4.addActionListener(this);

t1 = new JTextField(25);

t2 = new JTextField(35);

t1.setFont(font2);

t2.setFont(font2);

p1 = new JPanel();

p2 = new JPanel();

bq1 = new JLabel("结");

bq2 = new JLabel("果");

p1.setLayout(new GridLayout(2,3));

p2.setLayout(new GridLayout(4,4));

p1.add(t1);p1.add(b1);p1.add(b2);

p1.add(t2);p1.add(bq1);p1.add(bq2 );

p2.add(a1);p2.add(a2);p2.add(a3);p2.add(c1);

p2.add(a4);p2.add(a5);p2.add(a6);p2.add(c2);

p2.add(a7);p2.add(a8);p2.add(a9);p2.add(c3);

p2.add(b3);p2.add(a0);p2.add(b4);p2.add(c4);

this.add(p1,BorderLayout.NORTH);

this.add(p2,BorderLayout.CENTER);

this.setSize(460,380);

this.setTitle("简易计算器");

this.setLocation(200,200);

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

this.setVisible(true);

}

public void actionPerformed(ActionEvent e){

Object temp = e.getSource();

if(temp == a1){

if(chose==true){t1.setText("");t2.setText("");}

t1.setText(t1.getText()+""+"1");

chose=false;

}

if(temp == a2){

if(chose==true){t1.setText("");t2.setText("");}

t1.setText(t1.getText()+""+"2");

chose=false;

}

if(temp == a3){

if(chose==true){t1.setText("");t2.setText("");}

t1.setText(t1.getText()+""+"3");

chose=false;

}

if(temp == a4){

if(chose==true){t1.setText("");t2.setText("");}

t1.setText(t1.getText()+""+"4");

chose=false;

}

if(temp == a5){

if(chose==true){t1.setText("");t2.setText("");}

t1.setText(t1.getText()+""+"5");

chose=false;

}

if(temp == a6){

if(chose==true){t1.setText("");t2.setText("");}

t1.setText(t1.getText()+""+"6");

chose=false;

}

if(temp == a7){

if(chose==true){t1.setText("");t2.setText("");}

t1.setText(t1.getText()+""+"7");

chose=false;

}

if(temp == a8){

if(chose==true){t1.setText("");t2.setText("");}

t1.setText(t1.getText()+""+"8");

chose=false;

}

if(temp == a9){

if(chose==true){t1.setText("");t2.setText("");}

t1.setText(t1.getText()+""+"9");

chose=false;

}

if(temp == a0){

if(chose==true){t1.setText("");t2.setText("");}

t1.setText(t1.getText()+""+"0");

chose=false;

}

if(temp==b3){

cliks=true;

for(int i=0;i

if('.'==t1.getText().charAt(i)){

cliks=false;

break;

}

if(cliks==true){

t1.setText(t1.getText()+".");

}

}

}

if(temp== c1){

count=Double.parseDouble(t1.getText());

t1.setText("");

fuhao = "+";

}

if(temp== c2){

count=Double.parseDouble(t1.getText());

t1.setText("");

fuhao = "-";

}

if(temp== c3){

count=Double.parseDouble(t1.getText());

t1.setText("");

fuhao = "*";

}

if(temp== c4){

count=Double.parseDouble(t1.getText());

t1.setText("");

fuhao = "÷";

}

if(temp==b1){

t1.setText("");

t2.setText("");

}

if(temp==b2){

String s=t1.getText();

t1.setText("");

for(int i=0;i

char a = s.charAt(i);

t1.setText(t1.getText()+a);

}

}

if(temp== b4){

count2=Double.parseDouble(t1.getText());

t1.setText("");

if(fuhao=="+"){

//int sum=count+count2;

t1.setText(count+""+fuhao+""+count2+""+"=");

t2.setText(count+count2+"");

chose=true;

}

if(fuhao=="-"){

//int sum=count+count2;

t1.setText(count+""+fuhao+""+count2+""+"=");

t2.setText(count-count2+"");

chose=true;

}

if(fuhao=="*"){

//int sum=count+count2;

t1.setText(count+""+fuhao+""+count2+""+"=");

t2.setText(count*count2+"");

chose=true;

}

if(fuhao=="÷"){

//int sum=count+count2;

if(count2==0){

t1.setText(count+""+fuhao+""+count2+"");

t2.setText("除数不能为0");

return;

}

t1.setText(count+""+fuhao+""+count2+""+"=");

t2.setText(count/count2+"");

chose=true;

}

}

}

}

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谢谢了

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