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Constants for JFrame window close action

JFrame has the setDefaultCloseOperation method to control what the JFrame's close button does. The setDefaultCloseOperation method can take one of these static finals defined in the JFrame class: WindowConstants.DO_NOTHING_ON_CLOSE. Don't do anything. WindowConstants.HIDE_ON_CLOSE (the default). Hides the frame after invoking any registered WindowListener objects. WindowConstants.DISPOSE_ON_CLOSE. Hides and disposes the frame after invoking any registered WindowListener objects. JFrame.EXIT_ON_CLOSE. Exits the application using the System.exit method. import javax.swing.JFrame; import javax.swing.UIManager; public class SimplestFrame {   public static void main(String[] args) {     JFrame aWindow = new JFrame("This is the Window Title");     aWindow.setBounds(50, 100, 300, 300);     aWindow.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);     aWindow.setVisible(true);   } }