The split pane supports a one-touch-expandable capability that allows the user to conveniently move the divider to either end with a single click

  

import javax.swing.JButton;
import javax.swing.JSplitPane;

public class Main {
  public static void main(String[] argv) throws Exception {
    JButton topComponent = new JButton("top");
    JButton bottomComponent = new JButton("bottom");

    JSplitPane vpane = new JSplitPane(JSplitPane.VERTICAL_SPLIT, topComponent, bottomComponent);

    boolean b = vpane.isOneTouchExpandable(); // false by default

    vpane.setOneTouchExpandable(true);

  }
}

1.	Create a left-right split pane
2.	Create a top-bottom split pane
3.	A quick test of the JSplitPane class
4.	SplitPane Demo 2
5.	Swing SplitPane Sample
6.	Resize SplitPane
7.	SplitPane: VerticalSplit
8.	SplitPane Sample 3
9.	Property Split
10.	Use the split pane
11.	Continuously move the divider and resize its child components while the user is dragging the divider
12.	Getting the Setting the Children in a JSplitPane Container
13.	Getting and Setting the Divider Location in a JSplitPane Container
14.	Distributing Space When a JSplitPane Container Is Resized
15.	This program demonstrates the split pane component organizer.

The split pane supports a one-touch-expandable capability that allows the user to conveniently move the divider to either end with a single click : Splitpane « Swing JFC « Java

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