Here you can find the source of isStandardBorder(Border b)
public static boolean isStandardBorder(Border b)
//package com.java2s; /*/* w w w.ja va 2 s.c o m*/ * Copyright appNativa Inc. All Rights Reserved. * * This file is part of the Real-time Application Rendering Engine (RARE). * * RARE 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. * * 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, see <http://www.gnu.org/licenses/>. * */ import javax.swing.border.Border; import javax.swing.border.CompoundBorder; import javax.swing.plaf.UIResource; public class Main { public static boolean isStandardBorder(Border b) { if (b instanceof UIResource) { return true; } while (b instanceof CompoundBorder) { b = ((CompoundBorder) b).getInsideBorder(); } return (b instanceof UIResource); } }