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because I am displaying multiple images in my java programm, each image into a new jframe. I need to identify the selected jframe in oder to make changes on the displayed image and show it in the same jframe.

So, How could I recognize the last selected jframe ?

rafaoc
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1 Answers1

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I suggest you to use some other layout such as CardLayout to share same display space for multiple panel instead of using multiple JFrame.

See The Use of Multiple JFrames, Good/Bad Practice?

If you want to stick with current approach then create a global static reference of type JFrame to keep the reference of selected JFrame.

Use FocusListener to keep track of the selected JFarme

So, How could I recognize the last selected jframe ?

Keep the references of all opened JFrame and iterate all to check for JFrame#isFocused() or JFrame#isActive()

Community
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Braj
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  • I'd prefer creating a class that implements WindowAdapter (http://docs.oracle.com/javase/7/docs/api/java/awt/event/WindowAdapter.html) and keeps track of the active frame through event callbacks over iterating over the list of frames to find the active one. – Nate Aug 18 '14 at 19:20