Java: Image Viewer Frame

/**
 * 版权所有 2022 涂聚文有限公司
 * 许可信息查看：
 * 描述：
 * Core Java, Volume I： Fundamentals， Twelfth Edition by Cay S.Horstamnn
 * Core Java, Volume II： Advanced Features， Twelfth Edition by Cay S.Horstamnn
 * Core Java
 * 历史版本： JDK 17.01
 * 2022-09-12 创建者 geovindu
 * 2022-09-12 添加 Lambda
 * 2022-09-12 修改：date
 * 接口类
 * 2022-09-12 修改者：Geovin Du
 * 生成API帮助文档的指令：
 *javadoc - -encoding Utf-8 -d apidoc ImageViewerFrame.java
 * Interface
 * Record
 * Annotation
 * Enum
 * */


package CoreJava.twelfth;

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

/**
 *
 *
 * */
public class ImageViewerFrame  extends JFrame{

    private static final int DEFAULT_WIDTH = 300;
    private static final int DEFAULT_HEIGHT = 400;
    /**
     *
     *
     * */
    public ImageViewerFrame()
    {
        setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);

        // use a label to display the images
        var label = new JLabel();
        add(label);

        // set up the file chooser
        var chooser = new JFileChooser();
        chooser.setCurrentDirectory(new File("."));

        // set up the menu bar
        var menuBar = new JMenuBar();
        setJMenuBar(menuBar);

        var menu = new JMenu("File");
        menuBar.add(menu);

        var openItem = new JMenuItem("Open");
        menu.add(openItem);
        openItem.addActionListener(event ->
        {
            // show file chooser dialog
            int result = chooser.showOpenDialog(null);

            // if file selected, set it as icon of the label
            if (result == JFileChooser.APPROVE_OPTION)
            {
                String name = chooser.getSelectedFile().getPath();
                label.setIcon(new ImageIcon(name));
            }
        });

        var exitItem = new JMenuItem("Exit");
        menu.add(exitItem);
        exitItem.addActionListener(event -> System.exit(0));
    }
}

调用：

 //
            EventQueue.invokeLater(() ->
            {
                var Duframe = new ImageViewerFrame();
                Duframe.setTitle("图片浏览 Image Viewer");
                Duframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                Duframe.setVisible(true);
            });

输出：