Here you can find the source of clearWidth(JComponent comp)
public static void clearWidth(JComponent comp)
//package com.java2s; /*// w w w. j ava2 s .c o m Minica, a very simple certificate authority Copyright (C) 2011 Maurice Perry <maurice@perry.ch> This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program 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 GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. */ import java.awt.Dimension; import javax.swing.JComponent; public class Main { public static void clearWidth(JComponent comp) { Dimension size = comp.getMinimumSize(); size.width = 0; comp.setMinimumSize(size); size = comp.getPreferredSize(); size.width = 0; comp.setPreferredSize(size); } }