Why are no components displaying?

[James Hodgkiss]

I'm just experimenting with setBounds() and setLayout(null). But the following code doesn't work unless the scrollPaneHolder.setLayout(null) line is commented out.

Does anyone know why?

(What I am trying to achieve is to set the position of the scrollPane manually so that it's grey border is not visible.)

Cheers,
James

 
import java.awt.*;
import java.applet.*;
 
public class BoundsTestApplet extends Applet {
    
    public BoundsTestApplet() {
        
    }
    
    public void init() {
        Label label = new Label("Label");
        label.setBackground(Color.blue);
        label.setBounds(-10, -10, 100, 15);
        
        Panel centrePanel = new Panel();
        centrePanel.setLayout(null);
        centrePanel.setBackground(Color.green);
        
        ScrollPane scrollPane = new ScrollPane( ScrollPane.SCROLLBARS_ALWAYS );
        scrollPane.setBackground(Color.yellow);
        scrollPane.setBounds(-5, -5, 100, 100);
        
        Panel scrollPaneHolder = new Panel();
        scrollPaneHolder.setLayout(null); //If I comment out this line, everything displays ok
        scrollPaneHolder.setBackground(Color.red);
    
        this.resize(new Dimension(600, 600));
        this.setBackground(Color.cyan);
        
        centrePanel.add(label, null);
        scrollPane.add(centrePanel);
        scrollPaneHolder.add(scrollPane, null);
        this.add(scrollPaneHolder);
    }
    
}
 

[James Hodgkiss]

scrollPaneHolder.setSize(400, 400);