An example of interacting directly with the JRootPane of a JFrame

 
/*
Java Swing, 2nd Edition
By Marc Loy, Robert Eckstein, Dave Wood, James Elliott, Brian Cole
ISBN: 0-596-00408-7
Publisher: O'Reilly 
*/
// RootExample.java
//An example of interacting directly with the JRootPane of a JFrame.
//

import java.awt.Container;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JRootPane;

public class RootExample {
  public static void main(String[] args) {
    JFrame f = new JFrame();
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    JRootPane root = f.getRootPane(); // XXX Pay attention to these
    Container content = root.getContentPane(); // XXX lines. They get more
    content.add(new JButton("Hello")); // XXX explanation in the book.
    f.pack();
    f.setVisible(true);
  }
}

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An example of interacting directly with the JRootPane of a JFrame : RootPane « Swing JFC « Java

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