상속(4) instanceOf

	public static void main(String[] args) {

		Parent p = new Parent();
		Object obj = new Parent();
		
		Parent p1 = (Parent)obj; 
		p1.method();
		
		/*
		 	instanceOf
		 	: 상속받은 Object를 부모 클래스의 instance로 생성
		 	
		 	ChildOne	-> Parent
		 	ChildTwo	-> Parent
		 	
		 	생성된 instance에 어떤 자식 클래스가 생성되었는지 판별 할 수 있는 제어자
			
		 */
		
		Parent arrPar[] = new Parent[3];
		arrPar[0] = new ChildOne();
		arrPar[1] = new ChildTwo();
		arrPar[2] = new ChildOne();
		
		for (int i = 0; i < arrPar.length; i++) {
			arrPar[i].method();//over ride된 method
			
		if (arrPar[i] instanceof ChildOne) {//맞다면 true가 나옴
			ChildOne one = (ChildOne)arrPar[i];
			one.oneMethod();//over ride된 method 가 아님
			}
		}
	}

---

public class Parent/*부모클래스에는 extends Object가 항상 생략*/ {
	
	public void method() {
		System.out.println("Parent method()");
		
	}

}

---

public class ChildOne extends Parent {

	@Override
	public void method() {
		System.out.println("ChildOne Over Ride method()");
	}
	public void oneMethod() {
		// TODO Auto-generated method stub
		System.out.println("ChildOne oneMethod");
	}
}

---

public class ChildTwo extends Parent {
	@Override
	public void method() {
		// TODO Auto-generated method stub
		System.out.println("ChildTwo Over Ride method()");
	}
}