Disabling the Close Button on a JFrame

    

import javax.swing.JFrame;

public class Main {
  public static void main(String[] argv) throws Exception {
    // 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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Disabling the Close Button on a JFrame : Frame « Swing JFC « Java

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