package w5;

abstract class Shape{
    public abstract void draw();   
}
class Circle extends Shape{
    @Override
    public void draw() {
        System.out.println("画一个圆");
    }
}
class Rectangle extends Shape{
    @Override
    public void draw() {
        System.out.println("画一个矩形");
    }
}
class ShapeTest{
    public static void main(String[] args){
        Shape circle = new Circle();
        circle.draw();
        Shape rectangle = new Rectangle();
        rectangle.draw();
    }
}