Here you can find the source of setPreferredHeight(JComponent component, int height)
public static void setPreferredHeight(JComponent component, int height)
//package com.java2s; /*// w w w . j ava 2 s . c om * Copyright (c) 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015 David Berkman * * This file is part of the SmallMind Code Project. * * The SmallMind Code Project is free software, you can redistribute * it and/or modify it under the terms of GNU Affero General Public * License as published by the Free Software Foundation, either version 3 * of the License, or (at your option) any later version. * * The SmallMind Code Project 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 the GNU Affero General Public * License, along with the SmallMind Code Project. If not, see * <http://www.gnu.org/licenses/>. * * Additional permission under the GNU Affero GPL version 3 section 7 * ------------------------------------------------------------------ * If you modify this Program, or any covered work, by linking or * combining it with other code, such other code is not for that reason * alone subject to any of the requirements of the GNU Affero GPL * version 3. */ import java.awt.Dimension; import javax.swing.JComponent; public class Main { public static void setPreferredHeight(JComponent component, int height) { component.setPreferredSize(new Dimension((int) component.getPreferredSize().getWidth(), height)); } }