OverlayLayout: for layout management of components that lie on top of one another : OverlayLayout « Swing « Java Tutorial

1. Java Tutorial
2. Swing
3. OverlayLayout

1. Using add(Component com) to add component in sequence.
2. Using add(Component component, int index) to add components in any order.

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.LayoutManager;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.OverlayLayout;

public class OverlaySample {
  public static void main(String args[]) {
    JFrame frame = new JFrame("Overlay Example");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    JPanel panel = new JPanel() {
      public boolean isOptimizedDrawingEnabled() {
        return false;
      }
    };
    LayoutManager overlay = new OverlayLayout(panel);
    panel.setLayout(overlay);

    JButton button = new JButton("Small");
    button.setMaximumSize(new Dimension(25, 25));
    button.setBackground(Color.white);
    panel.add(button);
    
    button = new JButton("Medium");
    button.setMaximumSize(new Dimension(50, 50));
    button.setBackground(Color.gray);
    panel.add(button);
    
    button = new JButton("Large");
    button.setMaximumSize(new Dimension(100, 100));
    button.setBackground(Color.black);
    panel.add(button);    

    frame.add(panel, BorderLayout.CENTER);

    frame.setSize(400, 300);
    frame.setVisible(true);
  }
}

14.91.OverlayLayout
	14.91.1.	OverlayLayout: for layout management of components that lie on top of one another
	14.91.2.	OverlayLayout: center
	14.91.3.	OverlayLayout: alignment 0