shapes.java.bak

java编程思想的部分实现

//:c07:Shapes.java
class Shape
{
	void draw(){}
	void erase(){}
}
class Circle extends Shape
{
	void draw()
	{
		System.out.println("Circle.draw()");
	}
	void erase()
	{
		System.out.println("Circle.erase()");
	}
}
class Square extends Shape
{
	void draw()
	{
		System.out.println("Sqare.draw()");
	}
	void erase()
	{
		System.out.println("Sqare.erase");
	}
}
class Triangle extends Shape
{
	void draw()
	{
		System.out.println("Triangle.draw()");
	}
	void erase()
	{
		System.out.println("Triangle.erase()");
	}
}
public class Shapes 
{
	public static Shape randShape()
	{
		switch((int)(Math.random()*3))
		{
			default:
			case 0 :return new Circle();
			case 1:return new Square();
			case 2:return new Triangle();
		}
	}
		public static void main(String [] args)
		{
			Shape[]s= new Shape[9];
			for(int i=0;i<s.length;i++)
			{
				s[i]=randShape();
				for(int i=0;i<s.length;i++)
				{
					s[i].draw();
				}
			}
		}
	
}