Java tutorial
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); } }