Here you can find the source of loadUIManager()
public static void loadUIManager()
//package com.java2s; //License from project: LGPL import javax.swing.*; import javax.swing.UIManager.LookAndFeelInfo; import java.awt.*; import java.lang.reflect.Method; import java.util.*; public class Main { public static void loadUIManager() { boolean lafLoaded = false; if (isMac()) { System.setProperty("apple.awt.graphics.UseQuartz", "true"); System.setProperty("apple.awt.antialiasing", "true"); System.setProperty("apple.awt.rendering", "VALUE_RENDER_QUALITY"); System.setProperty("apple.laf.useScreenMenuBar", "true"); System.setProperty("apple.awt.draggableWindowBackground", "true"); System.setProperty("apple.awt.showGrowBox", "true"); try { try { // We need to do this using dynamic class loading to avoid other platforms // having to link to this class. If the Quaqua library is not on the classpath // it simply won't be used. Class<?> qm = Class.forName("ch.randelshofer.quaqua.QuaquaManager"); Method method = qm.getMethod("setExcludedUIs", Set.class); Set<String> excludes = new HashSet<String>(); excludes.add("Button"); excludes.add("ToolBar"); method.invoke(null, excludes); } catch (Throwable e) { }// w ww . ja v a 2 s . c om //set the Quaqua Look and Feel in the UIManager UIManager.setLookAndFeel("ch.randelshofer.quaqua.QuaquaLookAndFeel"); lafLoaded = true; } catch (Exception e) { } UIManager.put("SystemFont", new Font("Lucida Grande", Font.PLAIN, 13)); UIManager.put("SmallSystemFont", new Font("Lucida Grande", Font.PLAIN, 11)); } try { if (!lafLoaded) { if (isMac()) { UIManager.setLookAndFeel("javax.swing.plaf.metal"); } else { try { for (LookAndFeelInfo info : UIManager.getInstalledLookAndFeels()) { if ("Nimbus".equals(info.getName())) { UIManager.setLookAndFeel(info.getClassName()); break; } } } catch (Exception e) { // If Nimbus is not available, you can set the GUI to another look and feel. UIManager.setLookAndFeel("javax.swing.plaf.metal"); } } //UIManager.getSystemLookAndFeelClassName()); } } catch (Exception e) { } } public static boolean isMac() { return System.getProperty("os.name").toLowerCase().startsWith("mac"); } }