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Moving the JSplitPane Divider

Reset the divider position to that position by calling the resetToPreferredSizes() method of JSplitPane. Change the dividerLocation property with setDividerLocation(newLocation). 0.0 and 1.0, representing a percentage of the JSplitPane container width. import java.awt.BorderLayout; import javax.swing.JButton; import javax.swing.JComponent; import javax.swing.JFrame; import javax.swing.JSplitPane; public class MovingJSplitPaneDivider {   public static void main(String[] a) {     JFrame horizontalFrame = new JFrame();     horizontalFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);     JComponent topButton = new JButton("Left");     JComponent bottomButton = new JButton("Right");     final JSplitPane splitPane = new JSplitPane(JSplitPane.VERTICAL_SPLIT);     splitPane.setTopComponent(topButton);     splitPane.setBottomComponent(bottomButton);          horizontalFrame.add(splitPane, BorderLayout.CENTER);     horizontalFrame.setSize(150, 150);     horizontalFrame.setVisible(true);     splitPane.setDividerLocation(0.5);   } } With the system-provided look and feel classes, pressing the F8 key allows you to move the divider with the keyboard keys such as Home, End, or the arrows. F8 isn't a modifier like Shift or Alt.