Containers
/*
* 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.
*/
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Font;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
/**
* 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
}
public static void main(String[] args) {
JFrame frame = new JFrame();
frame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
frame.getContentPane().add(new Containers(), BorderLayout.CENTER);
// Finally, set the size of the main window, and pop it up.
frame.setSize(600, 400);
frame.setVisible(true);
}
}
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