Java学习例子：显示图片

约定不等于承诺〃 2021-11-11 05:40 225阅读 0赞

package com.oceanstar.demo;
    
    import javax.swing.*;
    import java.awt.*;
    import java.awt.event.ActionEvent;
    import java.awt.event.ActionListener;
    import java.io.File;
    
    public class ImageViewer {
        
        public static void main(String[] args) {
        
            EventQueue.invokeLater(new Runnable() {
        
                @Override
                public void run() {
        
                    JFrame frame = new ImageViewerFrame();
                    frame.setTitle("ImageViewer");
                    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                    frame.setVisible(true);
                }
            });
        }
    }
    
    
    class ImageViewerFrame extends JFrame{
        
        private JLabel lable;
        private JFileChooser chooser;
        private static final int DEFAULT_WIDTH = 300;
        private static final int DEFAULT_HEIGHT = 400;
    
        public ImageViewerFrame(){
        
            setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
    
            lable = new JLabel();
            add(lable);
    
            chooser = new JFileChooser();
            chooser.setCurrentDirectory(new File("."));
    
            JMenuBar menuBar = new JMenuBar();
            setJMenuBar(menuBar);
    
            JMenu menu = new JMenu("file");
            menuBar.add(menu);
    
            JMenuItem openItem = new JMenuItem("open");
            menu.add(openItem);
            openItem.addActionListener(new ActionListener() {
        
                @Override
                public void actionPerformed(ActionEvent e) {
        
                    int result = chooser.showOpenDialog(null);
    
                    if(result == JFileChooser.APPROVE_OPTION){
        
                        String name = chooser.getSelectedFile().getPath();
                        lable.setIcon(new ImageIcon(name));
                    }
                }
            });
    
            JMenuItem exitItem = new JMenuItem("exit");
            menu.add(exitItem);
            exitItem.addActionListener(new ActionListener() {
        
                @Override
                public void actionPerformed(ActionEvent e) {
        
                    System.exit(0);
                }
            });
    
        }
    }

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaXpoZW5nZ3Vhbg_size_16_color_FFFFFF_t_70]  
来自：《Java核心基础知识，卷一》

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaXpoZW5nZ3Vhbg_size_16_color_FFFFFF_t_70]: /images/20211109/e43393832b65442094acf61b44d15cc4.png