4월 20일 Java - 사진 이미지 열기

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

public class JFrameEx extends JFrame {
    private JLabel imageLabel = new JLabel();
    public JFrameEx(){
        setTitle("Menu 만들기 예제");
        Container c = getContentPane();
        c.add(imageLabel);
        createMenu();
        setSize(500, 500);
        setVisible(true);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }

    private void createMenu() {
        JMenuBar mb = new JMenuBar();
        JMenu screenMenu = new JMenu("Screen");

        screenMenu.add(new JMenuItem("Load"));
        screenMenu.add(new JMenuItem("Hide"));
        screenMenu.add(new JMenuItem("ReShow"));
        screenMenu.addSeparator();
        screenMenu.add(new JMenuItem("Exit"));

        JMenu fileMenu = new JMenu("File");
        JMenuItem openItem = new JMenuItem("Open");
        fileMenu.add(openItem);
        mb.add(fileMenu);

       openItem.addActionListener(new OpenActionListener());

        mb.add(screenMenu);
        mb.add(new JMenu("Edit"));
        mb.add(new JMenu("Source"));
        mb.add(new JMenu("Project"));
        mb.add(new JMenu("Run"));

        setJMenuBar(mb);
    }

    class OpenActionListener implements ActionListener{
        private JFileChooser chooser;
        public OpenActionListener(){
            chooser = new JFileChooser();
        }

        @Override
        public void actionPerformed(ActionEvent e) {
            FileNameExtensionFilter filter
                    = new FileNameExtensionFilter("JPG & GIF Images", "jpg", "gif");
            chooser.setFileFilter(filter);

            int ret = chooser.showOpenDialog(null);
            if(ret !=JFileChooser.APPROVE_OPTION){
                JOptionPane.showMessageDialog(null, "파일을 선택하지 않았습니다.",
                        "경고", JOptionPane.WARNING_MESSAGE);
                return;
            }
            String filePath = chooser.getSelectedFile().getPath();
            imageLabel.setIcon(new ImageIcon(filePath));
            pack();
        }
    }

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