Here you can find the source of setDefaultFont(Font font)
public static void setDefaultFont(Font font)
//package com.java2s; /*/*from w w w . j av a2 s . c o m*/ * Copyright 2014 kohii. * * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except * in compliance with the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * 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. */ import java.awt.Font; import javax.swing.UIManager; import javax.swing.plaf.FontUIResource; public class Main { public static void setDefaultFont(Font font) { FontUIResource fontUIResource = new FontUIResource(font); for (java.util.Map.Entry<?, ?> entry : UIManager.getDefaults().entrySet()) { if (entry.getKey().toString().toLowerCase().endsWith("font")) { UIManager.put(entry.getKey(), fontUIResource); } } } }