Java tutorial
//package com.java2s; /* * Copyright (C) 2004 NNL Technology AB * Visit www.infonode.net for information about InfoNode(R) * products and how to contact NNL Technology AB. * * 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 2 * 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, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, * MA 02111-1307, USA. */ import java.awt.Component; import java.awt.Container; import javax.swing.JComponent; public class Main { public static void setAllOpaque(Container c, boolean opaque) { if (c instanceof JComponent) { ((JComponent) c).setOpaque(opaque); for (int i = 0; i < c.getComponentCount(); i++) { Component comp = c.getComponent(i); if (comp instanceof Container) setAllOpaque((Container) comp, opaque); } } } }