import java.awt.Toolkit;

import javax.swing.JFrame;


public class Test2 extends JFrame{
	public static void main(String[] args) {
		JFrame jf=new JFrame();
		int windowsWedth = 600;
		int windowsHeight = 600;
		int width = Toolkit.getDefaultToolkit().getScreenSize().width;
		int height = Toolkit.getDefaultToolkit().getScreenSize().height;
		jf.setBounds((width - windowsWedth) / 2,(height - windowsHeight) / 2, windowsWedth, windowsHeight);
		jf.setVisible(true);
		
	}
}