import javax.swing.*;

/** an instance is like a JFrame but it has more methods. */
public class SquareJFrame extends JFrame {

    /** 
     * Set the height of the window to its width.
	 * There is a minimum height, so if you try
     * to make it smaller than that, Java won't
     * let you.
     */
    public void setHeighttoWidth() {
        setSize(getWidth(), getWidth());
    }

    /** Yields: area of the window */
    public int area() {
        return getWidth() * getHeight();
    }

}