To reproduce(JDK1.1.5 Swing-Pre-1.0(2/3) WindowNT):

1) run the following code.
2) output will be

3 // bad
3 // bad
3
1
2
3


import java.awt.*;
import java.awt.event.*;
import com.sun.java.swing.*;

 public class LayerTest
 {
    public static void main(String[] args) {
        Button b1 = new Button();
        Button b2 = new Button();
        Button b3 = new Button();
        JButton jb1 = new JButton();
        JButton jb2 = new JButton();
        JButton jb3 = new JButton();

        JLayeredPane lp = new JLayeredPane();
        lp.setLayer(b1, 1);
        lp.setLayer(b2, 2);
        lp.setLayer(b3, 3);
        lp.setLayer(jb1, 1);
        lp.setLayer(jb2, 2);
        lp.setLayer(jb3, 3);
        System.out.println(lp.getLayer(b1));
        System.out.println(lp.getLayer(b2));
        System.out.println(lp.getLayer(b3));
        System.out.println(lp.getLayer(jb1));
        System.out.println(lp.getLayer(jb2));
        System.out.println(lp.getLayer(jb3));
    }

}