why doesn't the frame close when i press the escape key?

Question

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;


public class displayFullScreen extends JFrame {
        private JLabel alarmMessage = new JLabel(         


        

Answer 1

You are not closing your your frame at esc key. You are just setting its default close operation so you must write

System.exit(0);

or

dispose();

instead of

setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);

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If you don't want to exit the application then use setVisible(false).

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Tip:

VK_ESCAPE is static filed of KeyEvent class so instead of ke.VK_ESCAPE you can write KeyEvent.VK_ESCAPE.