作业5 四则运算 测试与封装 5.2

import java.awt.*;
import java.math.BigDecimal;
import java.util.Random;
import java.awt.EventQueue;

import javax.swing.*;
import javax.swing.border.EmptyBorder;

import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;

public class SZYS extends JFrame {
int a;
int b;
int op;
String text1,text2,text3;
int num1,num2,num3;
int result;

private JPanel contentPane;

/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
SZYS frame = new SZYS();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}

/**
* Create the frame.
*/
public SZYS() {
String Operator = null;
getContentPane().setLayout(null);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 450, 250);
setLocationRelativeTo(null);
setResizable(false);
setTitle("四则运算");
JLabel lable1=new JLabel("四则运算");
lable1.setFont(new Font("宋体", Font.PLAIN, 24));
lable1.setBounds(170, 15, 96, 30);
getContentPane().add(lable1);
JTextField textField1 = new JTextField();
textField1.setBounds(50, 65, 40, 30);
getContentPane().add(textField1);
JTextField textField2 = new JTextField();
textField2.setBounds(160, 65, 40, 30);
getContentPane().add(textField2);
JLabel lable3=new JLabel("＝");
lable3.setFont(new Font("宋体", Font.PLAIN, 24));
lable3.setBounds(230, 65, 40, 30);
getContentPane().add(lable3);
JTextField textField3 = new JTextField();
textField3.setBounds(290, 65, 40, 30);
getContentPane().add(textField3);
JButton Button1  = new JButton("确定");
Button1.setBounds(350, 65, 60, 30);
getContentPane().add(Button1);
JButton Button2  = new JButton("再做一次");
Button2.setBounds(170, 180, 90, 30);
getContentPane().add(Button2);
int op=new Random().nextInt(4);
switch(op)
{
case 0:
Operator=new String("＋");
break;
case 1:
Operator=new String("－");
break;
case 2:
Operator=new String("×");
break;
case 3:
Operator=new String("÷");
break;
}
JLabel lable2=new JLabel(Operator);
lable2.setFont(new Font("宋体", Font.PLAIN, 24));
lable2.setBounds(110, 65, 40, 30);
getContentPane().add(lable2);
Button1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
text1=textField1.getText();
text2=textField2.getText();
text3=textField3.getText();
num1=Integer.parseInt(text1);
num2=Integer.parseInt(text2);
num3=Integer.parseInt(text3);

if(op==0)
{
result=num1+num2;
}
if(op==1)
{
result=num1-num2;
}
if(op==2)
{
result=num1*num2;
}
if(op==3)
{
result=num1/num2;
}
if(num3==result)
{
JOptionPane.showMessageDialog(null, "恭喜你！答对了！","提示",JOptionPane.ERROR_MESSAGE);
}
else
JOptionPane.showMessageDialog(null, "答错了！答案是"+result+"！","提示",JOptionPane.ERROR_MESSAGE);
}
});
//        JTextArea textbox = new JTextArea(200,20);
//        textbox.setBounds(120, 110, 200, 60);
//            textbox.setText("恭喜你！\n答对了！");
//        textbox.setEditable(false);
//        getContentPane().add(textbox);
}
}