Here you can find the source of getSeparator()
public static JPanel getSeparator()
//package com.java2s; /**/*w ww.j a v a 2 s .c o m*/ * Copyright (C) 2004 - 2012 Nils Asmussen * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ import java.awt.*; import javax.swing.*; public class Main { /** * Builds a separator panel * * @return the panel */ public static JPanel getSeparator() { JPanel sep = new JPanel() { private static final long serialVersionUID = 3543668010487797227L; public void paintComponent(Graphics g) { int half = getWidth() / 2; g.setColor(UIManager.getColor("controlShadow")); g.drawLine(half, 0, half, getHeight()); } }; sep.setPreferredSize(new Dimension(10, 20)); return sep; } }