Display problems with custom JComponent

Question

I am having issues displaying two custom JComponents at the same time.
I have created a class which extends JWindow, and runs the following
code:
getContentPane().add(new CustomComponent(20,20));
getContentPane().add(new CustomComponent(120,20));
setSize(640,480);
setVisible(true);The class CustomComponent extends JComponent and has the following
method:
protected void paintComponent(Graphics g)
    g.fillOval(x,y,50,50);
}The problem is that only the second CustomComponent added is
displayed. When the following code is run, there is no problem:
getContentPane().add(new CustomComponent(20,20));
setSize(640,480);
setVisible(true);
getContentPane().add(new CustomComponent(120,20));
setSize(640,480);
setVisible(true);Note that BOTH setSize and setVisible must be run inbetween each
CustomComponent addition for them all to be displayed.
Can anybody shed any light on what's happening. I don't get this
problem when adding JLabel, so I guess it must be a problem with my
CustomComponent.
Thanks for your help.

Answer 1

Leaving it. Ok. This way you get a BorderLayout as default, which means that by adding both components without a position constraint, both are placed in the center position, probably overlaying each other.
Try setting the LayoutManager to null, and set both location and size on your custom components manually.