Using setBounds with jLayeredPane
I am trying to use setBounds with a jLayeredPane. For some reason the setBounds constraint does not work unless I add another component to the jFrame AFTER I add the jLayeredPane to my jFrame. For example, if my only component on my frame is a jLayeredPane, and I add it as follows:
this.add(layeredPane);
it does not work. The bounds fill the entire jFrame.
If I have other components before, such as:
this.add(jl);
this.add(layeredPane);
It still does not work. The layeredPane fills the entire JFrame and I cannot see the jl component.
Yet if I have:
this.add(layeredPane);
this.add(jl);
Then it works. The bounds works on the jLayeredPane.
Can someone explain to me why a component needs to be added AFTER I add the jLayeredPane for the bounds to work?
Attached is some code which I simplified which displays the problem:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
publicclass Mainextends JFrame
{
JLayeredPane layeredPane;
Component dragComponent;
int xAdjustment;
int yAdjustment;
public Main()
{
JLabel jl =new JLabel("Hello");
layeredPane =new JLayeredPane();
layeredPane.setLayout(null );
//layeredPane.setPreferredSize(new Dimension(300,300));
//layeredPane.setMaximumSize(new Dimension(400,400));
layeredPane.setBorder(BorderFactory.createLineBorder(Color.GREEN));
layeredPane.setBounds(50,50,600,500);
/** this is the line explained in my question **/
this.add(layeredPane);
}
publicstaticvoid main(String[] args)
{
JFrame frame =new Main();
frame.setDefaultCloseOperation( DISPOSE_ON_CLOSE );
frame.setSize(600, 600);
frame.setLocationRelativeTo(null );
frame.setVisible(true);
}
}
