containers.java

java 的164个例子的源代码,包括了 很多方面,供包括了19个方面的 源代码

/*
 * Copyright (c) 2000 David Flanagan.  All rights reserved.
 * This code is from the book Java Examples in a Nutshell, 2nd Edition.
 * It is provided AS-IS, WITHOUT ANY WARRANTY either expressed or implied.
 * You may study, use, and modify it for any non-commercial purpose.
 * You may distribute it non-commercially as long as you retain this notice.
 * For a commercial use license, or to purchase the book (recommended),
 * visit http://www.davidflanagan.com/javaexamples2.
 */
package com.davidflanagan.examples.gui;
import javax.swing.*;
import java.awt.*;

/**
 * A component subclass that demonstrates nested containers and components.
 * It creates the hierarchy shown below, and uses different colors to
 * distinguish the different nesting levels of the containers
 *
 * Containers---panel1----button1
 *        |       |---panel2----button2
 *        |       |        |----panel3----button3
 *        |       |------panel4----button4
 *        |                   |----button5
 *        |---button6
 */
public class Containers extends JPanel {
    public Containers() {
	this.setBackground(Color.white);            // This component is white
	this.setFont(new Font("Dialog", Font.BOLD, 24));

	JPanel p1 = new JPanel();
	p1.setBackground(new Color(200, 200, 200)); // Panel1 is darker
	this.add(p1);                // p1 is contained by this component
	p1.add(new JButton("#1"));   // Button 1 is contained in p1
	
	JPanel p2 = new JPanel();
	p2.setBackground(new Color(150, 150, 150)); // p2 is darker than p2
	p1.add(p2);                  // p2 is contained in p1
	p2.add(new JButton("#2"));   // Button 2 is contained in p2
	
	JPanel p3 = new JPanel();
	p3.setBackground(new Color(100, 100, 100)); // p3 is darker than p2
	p2.add(p3);                  // p3 is contained in p2
	p3.add(new JButton("#3"));   // Button 3 is contained in p3
	
	JPanel p4 = new JPanel();
	p4.setBackground(new Color(150, 150, 150)); // p4 is darker than p1
	p1.add(p4);                  // p4 is contained in p1
	p4.add(new JButton("#4"));   // Button4 is contained in p4
	p4.add(new JButton("#5"));   // Button5 is also contained in p4
	
	this.add(new JButton("#6")); // Button6 is contained in this component
    }
}