Java/com/study/demo12/VerifyCodeFrame.java

package com.study.demo12;

import java.awt.*;
import java.awt.event.*;

public class VerifyCodeFrame extends Frame {
    private Label codeLabel;

    public VerifyCodeFrame() {
        setTitle("验证码生成窗口");
        setSize(300, 150);
        setLayout(new FlowLayout());

        Button codeButton = new Button("获取验证码");
        codeLabel = new Label("点击按钮获取验证码");

        codeButton.addActionListener(e -> {
            String timestamp = String.valueOf(System.currentTimeMillis());
            String last4Digits = timestamp.substring(timestamp.length() - 4);
            codeLabel.setText("CODE" + last4Digits);
        });

        addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });

        add(codeButton);
        add(codeLabel);
        setVisible(true);
    }

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