Disabling the Close Button on a JFrame
By default, when the close button on a frame is clicked, the frame
hides itself. This example shows how to disable the close button:
// Create a frame
JFrame frame = new JFrame();
// Get default close operation
int op = frame.getDefaultCloseOperation(); // HIDE_ON_CLOSE
// Set to ignore the button
frame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
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