/**
 * Abstract geometrical shape that intrinsically knows how to compute its area.
 * Concrete methods to compute areas are relegated to concrete subclasses.
 * @author Dung X. Nguyen
 * 

 * Copyright 2001 by Dung X. Nguyen - All rights reserved.
 * 

 */
public abstract class AShape {
    /**
     * For concrete subclasses to provide code to compute the area.
     * @return this Shape's area.
     */
    public abstract double getArea();
}