import javax.swing.JFrame;
import java.awt.Label;

public class CloseWindowWithJFrame
{
	public static void main(String[] args)
	{
		// Create a JFrame
		JFrame frame = new JFrame("Closing a JFrame Window");

		// Create a label and add it to the frame
		Label label = new Label("This is a JFrame...", Label.CENTER);
		frame.add(label);

		// Set the size (in pixels) and location (center screen) of the frame
		//  and make the frame visible
		frame.setSize(400, 400);
		frame.setLocationRelativeTo(null);
		frame.setVisible(true);

		// With a JFrame (as opposed to a Frame), this single line can be
		//  used to cause the window to close
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}
}