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import java.awt.BorderLayout; import java.awt.Color; import java.awt.Container; import java.awt.FlowLayout; import java.awt.Font;

import java.awt.GridLayout; import java.awt.Label; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.util.Random;

import javax.swing.*;

import javax.swing.GroupLayout.Alignment;

class randomtimu {

double x1; double x2; char yunsuan;

final char[] Yun=new char[]{'+','-','*','/'}; double result;

String errorString=\; public randomtimu() {

x1=Math.random()*100; x2=Math.random()*100;

yunsuan=Yun[(int)(Math.random()*4)]; switch (yunsuan) {

case '+':

result=x1+x2; break;

case '-':

result=x1-x2;

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break;

case '*':

result=x1*x2; break; case '/': if(x2==0) {

errorString=\; }

else {

result=x1/x2; }

break; default: break; } } }

public class test6 extends JFrame {

private JPanel contentPane;

JTextField jTextField=new JTextField(10); JTextField jTextField3=new JTextField(10); JTextField jTextField4=new JTextField(10); JLabel jLabel=new JLabel(\,JLabel.CENTER); JLabel jLabel2=new JLabel(\,JLabel.CENTER); JLabel jLabel3=new JLabel(\); double result=0;

public static void main(String[] args) {

new test6().setVisible(true); } /**

* Create the Frame. */

public test6() {

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); Container container=getContentPane(); setBounds(500,100,600,150); setLayout(new BorderLayout()); JPanel jPanel=new JPanel();

jPanel.setLayout(new FlowLayout(FlowLayout.CENTER, 10, 10));

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JPanel jPanel2=new JPanel();

JButton jButton2=new JButton(\È·ÈÏ´ð°¸\); jPanel2.add(jButton2);

JButton jButton=new JButton(\»ñÈ¡ÌâÄ¿\); jPanel.add(jButton);

jPanel.add(jTextField3); jTextField3.setSize(20,10); jPanel.add(jLabel);

jLabel2.setFont(new Font(\ºÚÌå\, Font.BOLD, 18)); jPanel.add(jTextField); jPanel.add(jLabel2);

jLabel.setFont(new Font(\ºÚÌå\, Font.BOLD, 18)); jPanel.add(jTextField4);

container.add(jPanel,BorderLayout.NORTH); container.add(jPanel2); jPanel2.add(jLabel3);

jButton.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

randomtimu randomtimu1=new randomtimu(); jTextField4.setText(\); jLabel3.setText(\);

jTextField3.setText(String.format(\,randomtimu1.x1));

jTextField.setText(String.format(\,randomtimu1.x2)); jLabel.setText(randomtimu1.yunsuan+\);

if(randomtimu1.errorString.equals(\)) {

JOptionPane.showMessageDialog(null, \³ýÊý²»ÄÜΪÁã\); }

else {

result=randomtimu1.result; } } });

jButton2.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e)

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{

if(jTextField4.getText().equals(\)||jTextField4.getText()==null) {

JOptionPane.showMessageDialog(null, \´ð°¸²»ÄÜΪ¿Õ\); }

else {

double

string=Double.parseDouble(jTextField4.getText()); String answer=\ÕýÈ·½á¹ûÊÇ\+String.format(\,result);

if(Math.abs(string-result)<0.01) {

answer=\´ð°¸ÕýÈ·\+answer; } else {

answer=\´ð°¸´íÎó\+answer; }

jLabel3.setText(answer); } } }); } }

2¡¢Ô˶¯µÄÃÔÄãС³µÍâ¼ÓͼÏñ·Å´ó¹¦ÄÜ import java.awt.BorderLayout; import java.awt.Canvas; import java.awt.Container; import java.awt.FlowLayout; import java.awt.Graphics; import java.awt.Graphics2D;

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