Java tutorial
//package com.java2s; import java.awt.Color; import java.awt.Dimension; import java.awt.Graphics; import javax.swing.JSplitPane; import javax.swing.UIDefaults; import javax.swing.plaf.basic.BasicSplitPaneDivider; import javax.swing.plaf.basic.BasicSplitPaneUI; public class Main { public static void flattenSplitPane(JSplitPane jSplitPane) { UIDefaults defaults = javax.swing.UIManager.getDefaults(); final Color light = defaults.getColor("SplitPane.highlight"); final Color dark = defaults.getColor("SplitPane.darkShadow"); // * jSplitPane.setUI(new BasicSplitPaneUI() { public BasicSplitPaneDivider createDefaultDivider() { BasicSplitPaneDivider divider = new BasicSplitPaneDivider(this) { private static final long serialVersionUID = 1L; @Override public int getDividerSize() { return 5; } @Override public void paint(Graphics g) { // super.paint(g); int orientation = this.getBasicSplitPaneUI().getOrientation(); Dimension size = this.getSize(); if (orientation == JSplitPane.VERTICAL_SPLIT) { int[] lines = new int[2]; lines[0] = 0; lines[1] = size.height - 2; for (int i = 0; i < size.width; i += 4) { for (int j = 0; j < lines.length; j++) { int y = lines[j]; g.setColor(light); g.fillRect(i, y, 2, 2); g.setColor(dark); g.fillRect(i, y, 1, 1); } } } else { int[] rows = new int[2]; rows[0] = 0; rows[1] = size.width - 2; for (int i = 0; i < size.height; i += 4) { for (int j = 0; j < rows.length; j++) { int x = rows[j]; g.setColor(light); g.fillRect(x, i, 2, 2); g.setColor(dark); g.fillRect(x, i, 1, 1); } } } } }; return divider; } }); jSplitPane.setBorder(null); // */ } }