Java中的instanceof关键字

class instanceofDemo 
{
	public static void main(String[] args) 
	{
		CFather c1 = new CChild1();//父类对象引用指向子类对象
		
		test(c1);

		CFather c2 = new CChild2();

		test(c2);
	}

	public static void test(CFather c){
		c.print();

                //使用instanceof判断c是否是CChild2的一个实例
		if (c instanceof CChild2){
			CChild2 c2 = (CChild2)c;
			c2.print1();
		}
	}
}


abstract class CFather{
	abstract public void print();//抽象方法
}

class CChild1 extends CFather{
	
	//
	public void print(){
		System.out.println("this is Child1");
	}
}

class CChild2 extends CFather{

	public void print(){
		System.out.println("this is Child2");
	}

	//本类的其他方法
	public void print1(){
		System.out.println("hello java");
	}
}