Here you can find the source of getValidFieldColor()
public static Color getValidFieldColor()
//package com.java2s; /*//from w w w . j a va 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 java.awt.Color; import javax.swing.UIManager; public class Main { public static Color getValidFieldColor() { return UIManager.getColor("TextField.background"); } }