多态

package com.cn.test4;

public class Inherit {

 
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		int a=0;int b=9;int c=2;
		try{
		  c=b/a;
		}catch(Exception e){
			//System.out.println("ninhao");
			c=9;
		}
		System.out.println(c);
         circle cir=new circle();
         triangle tri=new triangle();
         line lin=new line();
         dosomthing(cir);
         dosomthing(tri);
         dosomthing(lin);
	}
  static  public void dosomthing(shape shape){
    	shape.erase();
    	shape.draw();
    }
}
class shape{
	 public void erase(){
		 System.out.println("shape i can erase");
	 }
	 public void draw(){
		 System.out.println("shape i can draw");
	 }
}
class circle extends shape{
	 public void erase(){
		 System.out.println("circle i can erase");
	 }
	 public void draw(){
		 System.out.println("circle i can draw");
	 }
}
class triangle extends shape{
	 public void erase(){
		 System.out.println("triangle i can erase");
	 }
	 public void draw(){
		 System.out.println("triangle i can draw");
	 }
}
class line extends shape{
	 public void erase(){
		 System.out.println("line i can erase");
	 }
	 public void draw(){
		 System.out.println("line i can draw");
	 }
}