package pack1;

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

public class my extends JFrame {

JLabel j1;

JTextField jt1,jt2,jt3;

JButton jb1,jb2,jb3,jb4,jb5,jb6;

int x=0,y=0,w,h;

double a3;

Container cp=getContentPane();

public my(){

setLayout(null);

j1=new JLabel("请输入两个运算数据");

jt1=new JTextField();

jt2=new JTextField();

jt3=new JTextField();

jb1=new JButton("+");

jb2=new JButton("-");

jb3=new JButton("*");

jb4=new JButton("/");

jb5=new JButton("确定");

jb6=new JButton("退出");

cp.add(j1);

cp.add(jt1);

cp.add(jt2);

cp.add(jt3);

cp.add(jb1);

cp.add(jb2);

cp.add(jb3);

cp.add(jb4);

cp.add(jb5);

cp.add(jb6);

j1.setBounds(50, 30, 150, 30);

jt1.setBounds(50, 100, 150, 50);

jt2.setBounds(250,100, 150, 50);

jt3.setBounds(50, 300, 350, 50);

jb1.setBounds(50, 210, 50, 30);

jb2.setBounds(150, 210, 50, 30);

jb3.setBounds(250, 210, 50, 30);

jb4.setBounds(350, 210, 50, 30);

jb5.setBounds(50, 400, 100, 30);

jb6.setBounds(300, 400, 100, 30);

setBounds(0, 0, 500, 500);

setVisible(true);

jt3.setEditable(false);

jb1.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

// TODO 自动生成的方法存根

double a1=Double.parseDouble(jt1.getText());

double a2=Double.parseDouble(jt2.getText());

a3=a1+a2;

}

});

jb2.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

// TODO 自动生成的方法存根

double a1=Double.parseDouble(jt1.getText());

double a2=Double.parseDouble(jt2.getText());

a3=a1-a2;

}

});

jb3.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

// TODO 自动生成的方法存根

double a1=Double.parseDouble(jt1.getText());

double a2=Double.parseDouble(jt2.getText());

a3=a1*a2;

}

});

jb4.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

// TODO 自动生成的方法存根

double a1=Double.parseDouble(jt1.getText());

double a2=Double.parseDouble(jt2.getText());

if(a2==0.0){

JLabel disp=new JLabel();

JDialog jd1=new JDialog();

disp.setText("除数不能为0");

jd1.getContentPane().add(disp);

}

a3=a1/a2;

}

});

jb5.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

// TODO 自动生成的方法存根

String a4=String.valueOf(a3);

jt3.setText(a4);

}

});

jb6.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

// TODO 自动生成的方法存根

System.exit(0);

}

});

}

}

运行代码：在创建一个主类，创建这个类的对象即可，欢迎评论，转载！