给这个代码添加退出按钮package chap03; import javax.swing.; import java.awt.; import java.awt.event.*; public class GuessNumber extends JFrame implements ActionListener { private JLabel promptLabel, resultLabel; private JTextField inputField; private JButton guessButton; private int targetNumber, guessCount, maxTryTime; public GuessNumber () { targetNumber = (int)(Math.random()*10)+1; guessCount = 0; maxTryTime = 5; promptLabel = new JLabel("请输入一个0~10之间的数字："); inputField = new JTextField(10); guessButton = new JButton("猜！"); guessButton.addActionListener(this); resultLabel = new JLabel(""); JPanel panel = new JPanel(); panel.add(promptLabel); panel.add(inputField); panel.add(guessButton); panel.add(resultLabel); this.add(panel); this.setTitle("猜数字游戏界面"); this.setSize(300, 150); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); this.setVisible(true); } public void actionPerformed(ActionEvent e) { String inputText = inputField.getText(); try { int guessNumber = Integer.parseInt(inputText); guessCount++; if (guessCount < maxTryTime) { int c = maxTryTime - guessCount; if (guessNumber > targetNumber) { resultLabel.setText("输入的过大，您还有" + c + "次机会"); } else if (guessNumber < targetNumber) { resultLabel.setText("输入的过小，您还有" + c + "次机会"); } else { resultLabel.setText("恭喜你，猜对了！你一共猜了" + guessCount + "次"); guessButton.setEnabled(false); } } else { resultLabel.setText("抱歉游戏失败"); guessButton.setEnabled(false); } } catch (NumberFormatException ex) { resultLabel.setText("输入异常，请重新输入!!!"); } } public static void main(String[] args) { new GuessNumber(); } }

好的，我可以为您添加一个退出按钮。下面是代码：

package chap03;

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class GuessNumber extends JFrame implements ActionListener {

    private JLabel promptLabel, resultLabel;
    private JTextField inputField;
    private JButton guessButton, exitButton;
    private int targetNumber, guessCount, maxTryTime;

    public GuessNumber () {
        targetNumber = (int)(Math.random()*10)+1;
        guessCount = 0;
        maxTryTime = 5;

        promptLabel = new JLabel("请输入一个0~10之间的数字：");
        inputField = new JTextField(10);
        guessButton = new JButton("猜！");
        guessButton.addActionListener(this);
        exitButton = new JButton("退出");
        exitButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                System.exit(0);
            }
        });

        resultLabel = new JLabel("");

        JPanel panel = new JPanel();
        panel.add(promptLabel);
        panel.add(inputField);
        panel.add(guessButton);
        panel.add(exitButton);
        panel.add(resultLabel);

        this.add(panel);
        this.setTitle("猜数字游戏界面");
        this.setSize(300, 150);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.setVisible(true);
    }

    public void actionPerformed(ActionEvent e) {
        String inputText = inputField.getText();
        try {
            int guessNumber = Integer.parseInt(inputText);
            guessCount++;
            if (guessCount < maxTryTime) {
                int c = maxTryTime - guessCount;
                if (guessNumber > targetNumber) {
                    resultLabel.setText("输入的过大，您还有" + c + "次机会");
                } else if (guessNumber < targetNumber) {
                    resultLabel.setText("输入的过小，您还有" + c + "次机会");
                } else {
                    resultLabel.setText("恭喜你，猜对了！你一共猜了" + guessCount + "次");
                    guessButton.setEnabled(false);
                }
            } else {
                resultLabel.setText("抱歉游戏失败");
                guessButton.setEnabled(false);
            }
        } catch (NumberFormatException ex) {
            resultLabel.setText("输入异常，请重新输入!!!");
        }
    }

    public static void main(String[] args) {
        new GuessNumber();
    }
}

我在原有代码的基础上，添加了一个名为 `exitButton` 的按钮，并为其添加了一个 `ActionListener`，当点击该按钮时，程序将通过 `System.exit(0)` 退出。同时，我也将该按钮添加到了 `JPanel` 中，以便在界面中显示。