How can I make Transparent background?

I want make some part of JFrame as Transparent so that I can see through.
How can I do this? any example?

This is a bug that I personally reported and had verified. Basically, you can modify the color of GUI components' backgrounds, right? Well, the Color object supports transparency. However, modifying this simply doesn't work (I actually tried it two ways). At any rate, what I observed was that it DID let me do transparency, but there were all kinds of repaint problems. So when 1.4 came out, I thought they might have fixed it. NOPE! They just threw out the implementation, at least for now. Now when I run in 1.4, I don't see ANY transparency AT ALL!

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