Unexpandable Window

While using JFrame, is it开发者_Go百科 possible to have the window unable to be expanded by the user?

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This is what you want. It explains it setResizable() method.

EDIT: If you would like a quick introduction, say your JFrame object is called myFrame, then, to make it non-resizable,

myFrame.setResizable(false);

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You just need call setResizable(false) on your JFrame, e.g.:

JFrame frame = new JFrame();
frame.setSize(500, 300);
frame.setResizable(false);
frame.setVisible(true);