一、题目描述

编写一个猜数程序，该程序随机在1到1000的范围中选择一个供用户猜测的整数。界面上提供一个文本框来接收用户输入的猜测的数，如果用户猜得太大，则背景变为红色，如果猜得太小，背景变为蓝色。用户猜对后，文本框变为不可编辑，同时提示用户猜对了。界面上提供一个按钮，使用户可以重新开始这个游戏。在界面上还需显示用户猜测的次数。

二、代码示例

import java.awt.event.*;
import javax.swing.*;            
import java.awt.*;
import java.util.Random;public class Main implements ActionListener{int count = 0;int answer;Random random;JPanel Jpanel;JLabel label1;JLabel label2;JLabel label3;JButton Button1;JButton Button2;JButton Button3;JTextField Text;public void set_Num()
{random = new Random();answer = Math.abs(random.nextInt()%1001);
}public Main()
{set_Num();System.out.println(answer);JFrame Frame = new JFrame();Frame.setSize(300, 220);Jpanel = new JPanel();Jpanel.setSize(300, 220);Jpanel.setBackground(null);Jpanel.setLayout(null);label1 = new JLabel("你已经猜了" + count + "次");label1.setBounds(5, 0, 150, 30);label1.setVisible(false);label2 = new JLabel("输入猜测的数");label2.setBounds(30, 50, 100, 30);Text = new JTextField();Text.setBounds(120, 50, 60, 30);label3 = new JLabel();label3.setBounds(190, 50, 100, 30);label3.setVisible(false);Button1 = new JButton("确认");Button1.addActionListener(this);Button1.setBounds(10, 110, 60, 30);Button2 = new JButton("重新开始");Button2.addActionListener(this);Button2.setBounds(80, 110, 100, 30);Button3 = new JButton("退出");Button3.addActionListener(this);Button3.setBounds(190, 110, 60, 30);Jpanel.add(Button1);Jpanel.add(Text);Jpanel.add(Button2);Jpanel.add(Button3);Jpanel.add(label1);Jpanel.add(label2);Jpanel.add(label3);Frame.add(Jpanel);Frame.setVisible(true);
}
public void actionPerformed(ActionEvent e) {  if(e.getSource()==	Button1){label1.setVisible(true);count ++;label1.setText("你已经猜了" + count + "次");String str = new String(Text.getText());int Num2 = Integer.parseInt(str);if(Num2 == answer){Text.setEditable(false);Jpanel.setBackground(null);label3.setVisible(true);label3.setText("GOOD JOB！");Button1.setEnabled(false);}else if(Num2 < answer){Jpanel.setBackground(Color.blue);label3.setVisible(true);label3.setText("太小");}else{Jpanel.setBackground(Color.red);label3.setVisible(true);label3.setText("太大");}}else if(e.getSource() == Button2){label1.setVisible(false);Text.setEditable(true);label3.setVisible(false);Button1.setEnabled(true);Text.setText(null);Jpanel.setBackground(null);count = 0;set_Num();System.out.println(answer);}else System.exit(0);} public static void main(String[] args) {Main m = new Main();}
}