Here you can find the source of setSystemLookAndFeel()
public static void setSystemLookAndFeel()
//package com.java2s; /********************************************************************************************** * * Asprise OCR Java API/*from w ww .ja v a2 s . c om*/ * Copyright (C) 1998-2015. Asprise Inc. <asprise.com> * * This file is licensed under the GNU Affero General Public License version 3 as published by * the Free Software Foundation. * * Unless required by applicable law or agreed to in writing, software distributed under the * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, * either express or implied. See the License for the specific language governing permissions * and limitations under the License. * * You should have received a copy of the GNU Affero General Public License. If not, please * visit <http://www.gnu.org/licenses/agpl-3.0.html>. * **********************************************************************************************/ import javax.swing.UIManager; public class Main { public static void setSystemLookAndFeel() { if (isWindows()) { setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); } else if (isMac()) { setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); } else { setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); } } public static boolean isWindows() { return System.getProperty("os.name").toLowerCase().contains("windows"); } private static boolean setLookAndFeel(String lookAndFeelClass) { try { UIManager.setLookAndFeel(lookAndFeelClass); return true; } catch (Throwable t) { System.err.println(t.getMessage()); return false; } } public static boolean isMac() { return System.getProperty("os.name").toLowerCase().contains("mac"); } }