java instanceof 使用

package cn.demo;

class Father {
	Father() {
		System.out.println("father construct function");
	}

	void method() {
		System.out.println("father method function");
	}
}

class Child extends Father {
	Child() {
		System.out.println("Child construct function");
	}

	public void method() {
		System.out.println("Child method function");
	}

	public void play() {
		System.out.println("play function");
	}
}

public class TestMain {
	
	public static void Func(Father f){
		f.method();
		
		if(f instanceof Child){
			Child c = (Child)f;
			c.play();
		}
	}
	public static void main(String[] str) {
		Father f = new Child();
		Func(f);
	}
}

功能类似于C++的dynamic_cast