Here you can find the source of contentPaneBorder(JComponent component)
public static JComponent contentPaneBorder(JComponent component)
//package com.java2s; /*//w w w.ja v a 2 s . c om Copyright 2003-2012 Dmitry Barashev, GanttProject Team This file is part of GanttProject, an opensource project management tool. GanttProject 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 3 of the License, or (at your option) any later version. GanttProject 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 GanttProject. If not, see <http://www.gnu.org/licenses/>. */ import javax.swing.BorderFactory; import javax.swing.JComponent; public class Main { public static final int TOP = 1, LEFT = 1 << 1, BOTTOM = 1 << 2, RIGHT = 1 << 3; public static JComponent contentPaneBorder(JComponent component) { return border(component, 5, TOP | LEFT | BOTTOM | RIGHT); } public static JComponent border(JComponent component, int width, int mask) { component.setBorder(BorderFactory.createEmptyBorder(width * (mask & TOP), width * (mask & LEFT) >> 1, width * (mask & BOTTOM) >> 2, width * (mask & RIGHT) >> 3)); return component; } }