Application runs and closes automatically

[Abder-Rahman Ali]

I have this code which is a JFrame with a JPanel and three buttons.

When I run the program it just closes AUTOMATICALLY. Why is that?

    
import java.awt.BorderLayout;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;


public class DisposeShapes {
	JLabel label = new JLabel("Add Rectangle");
		
	
	public void DisposeShapes()
		{
	    JFrame frame = new JFrame("Dispose shapes");
		JPanel panel = new JPanel();
		JButton addRectangle = new JButton("Add Rectangle");
		addRectangle.setSize(50, 100);
		addRectangle.addMouseListener(new MouseListener());
		JButton addSquare = new JButton("Add Square");
		addSquare.setSize(50,100);
		JButton addCircle = new JButton("Add circle");
		addCircle.setSize(50,100);
		frame.getContentPane().add(panel);
		panel.add(BorderLayout.NORTH, addRectangle);
		panel.add(BorderLayout.NORTH, addSquare);
		panel.add(BorderLayout.NORTH, addCircle);
		frame.setVisible(true);
		frame.setLocationRelativeTo(null);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setSize(500, 500);
		}
		
		public class MouseListener extends MouseAdapter
		{
			public void mouseClicked(MouseEvent me)
			{
				String str = label.getText();
				if(str.equals("Add Rectangle"))
				{
					System.out.println("You pressed the  " + " Add Rectangle " + "button");
				}
			}
		}
		
		public static void main(String[] args)
		{
			DisposeShapes disposeShapes = new DisposeShapes();
		}
}

Thanks.

[Rob Spoor]

What you think is a constructor isn't. It's a method that has the same name as a constructor would. Instead you are calling the default constructor that is generated automatically. Remove the "void" and see what happens.

[Abder-Rahman Ali]

Thanks Rob, you are absolutely right.