Here you can find the source of setFixedSize(JComponent component, Dimension size)
public static void setFixedSize(JComponent component, Dimension size)
//package com.java2s; /******************************************************************************* * Copyright (c) 2001, 2007 Mathew A. Nelson and Robocode contributors * All rights reserved. This program and the accompanying materials * are made available under the terms of the Common Public License v1.0 * which accompanies this distribution, and is available at * http://robocode.sourceforge.net/license/cpl-v10.html * * Contributors:/*from w ww .j a v a 2 s. c o m*/ * Mathew A. Nelson * - Initial API and implementation * Flemming N. Larsen * - Moved window related methods from robocode.util.Utils into this class *******************************************************************************/ import java.awt.*; import javax.swing.JComponent; public class Main { public static void setFixedSize(JComponent component, Dimension size) { component.setPreferredSize(size); component.setMinimumSize(size); component.setMaximumSize(size); } }