How to create a top-bottom split pane in Java?

To create a top-bottom split pane, let us create two components and split them −

JComponent one = new JLabel("Top Split");
one.setBorder(BorderFactory.createLineBorder(Color.MAGENTA));
JComponent two = new JLabel("Bottom Split");
two.setBorder(BorderFactory.createLineBorder(Color.ORANGE));

Now, we will split them. The two components will be split one on top of the other using VERTICAL_PANE constant −

JSplitPane splitPane = new JSplitPane(JSplitPane.VERTICAL_SPLIT, one, two);

The following is an example to create a top-bottom split pane in Java −

Example

package my;
import java.awt.Color;
import javax.swing.BorderFactory;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JSplitPane;
public class SwingDemo {
   public static void main(String[] a) {
      JFrame frame = new JFrame("SplitPane Demo");
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      JComponent one = new JLabel("Top Split");
      one.setBorder(BorderFactory.createLineBorder(Color.MAGENTA));
      JComponent two = new JLabel("Bottom Split");
      two.setBorder(BorderFactory.createLineBorder(Color.ORANGE));
      JSplitPane splitPane = new JSplitPane(JSplitPane.VERTICAL_SPLIT, one, two);
      frame.add(splitPane);
      frame.setSize(550, 250);
      frame.setVisible(true);
   }
}

Output