Changing caption color of awindow

Edited text of question

In java, there is no way.

You can give the environment you are working in and based on it, you can use some desktop tools to set the caption color etc.,.
I can suggest the tool if you want.

Please suggest the tool, but I a want solution that can be solved
by java program , I need to change the color of th caption  dynamically

How about implementing a Window class instead of a Frame class, and drawing bordures & caption by yourself? This is not so hard; the caption rectangle needs only to follow the movement of the mouse.

I am sorry but I tried what I said in the previous comment, and it can't work because Window class creates a modal window.

So the answer to your question is: you can't change the window's caption rectangle's color in Java. It is handled by the window manager.

You should think of creating alternative visual cues if you want the attention of the user.

You could probably do it with a native method.