Java tutorial
import javax.swing.JButton; import javax.swing.JSplitPane; public class Main { public static void main(String[] argv) throws Exception { JButton leftComponent = new JButton("left"); JButton rightComponent = new JButton("right"); JSplitPane pane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, leftComponent, rightComponent); int size = pane.getDividerSize(); size = 1; pane.setDividerSize(size); } }