imageviewer.java

Java程序设计技巧与开发实例附书源代码。

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

public class ImageViewer
    extends JFrame
    implements ListSelectionListener {
  private String FILES[] = {
      "scenery.jpg", "river.jpg", "swan.jpg"};
  private DefaultListModel data = new DefaultListModel();
  private JList list = new JList(data);
  private JLabel image = null;
  private class WindowCloser
      extends WindowAdapter {
    public void windowClosing(WindowEvent we) {
      System.exit(0);
    }
  }

  public ImageViewer() {
    super("Image Viewer");
    for (int i = 0; i < FILES.length; i++) {
      data.addElement( "Images/" + FILES[i]);
    }
    image = new JLabel(new ImageIcon(FILES[0]), SwingConstants.CENTER);
    list.setSelectedIndex(0);
    list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
    JScrollPane scrollList = new JScrollPane(list);
    JScrollPane scrollImage = new JScrollPane(image);
    JSplitPane splitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,
                                          scrollList, scrollImage);
    getContentPane().add("Center", splitPane);
    list.addListSelectionListener(this);
    addWindowListener(new WindowCloser());
    validate();
    pack();
    setVisible(true);
  }

  public void valueChanged(ListSelectionEvent lse) {
    if (!lse.getValueIsAdjusting()) {
      image.setIcon(new ImageIcon(list.getSelectedValue().toString()));
    }
  }

  public static void main(String args[]) {
    ImageViewer iv = new ImageViewer();
  }
}