The JSplitPane Class

A split pane is a special container that holds two components, each in its own sub-pane. A splitter bar adjusts the sizes of the two subpanes. In a document viewer, for example, you might use a split pane to show a table of contents next to a page of text. The following example uses two JLabels containing ImageIcons, like the previous example. It displays the two labels, wrapped in JScrollPanes, on either side of a JSplitPane (see Screenshot-10). You can drag the splitter bar back and forth to adjust the sizes of the two contained components.

 //file: SplitPaneFrame.java
 import java.awt.*;
 import java.awt.event.*;
 import javax.swing.*;
 import javax.swing.border.*;
 public class SplitPaneFrame {
 public static void main(String[] args) {
 String fileOne = "Piazza di Spagna.jpg";
 String fileTwo = "L1-Light.jpg";
 if (args.length > 0) fileOne = args[0];
 if (args.length > 1) fileTwo = args[1];
 JFrame frame = new JFrame("SplitPaneFrame");
 JLabel leftImage = new JLabel( new ImageIcon( fileOne ) );
 Component left = new JScrollPane(leftImage);
 JLabel rightImage = new JLabel( new ImageIcon( fileTwo ) );
 Component right = new JScrollPane(rightImage);
 JSplitPane split =
 new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, left, right);
 split.setDividerLocation(100);
 frame.getContentPane( ).add(split);
 frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
 frame.setSize(300, 200);
 frame.setVisible(true);
 }
 }

Screenshot-10. Using a split pane