객체 지향 프로그램 예제 1

//Hero.java --------------------------------------------------------------------------------
public class Hero {
	
	public static Object length;
	String name;
	public Hero(String name) {
		this.name = name;
		}
	public void attack() {
		System.out.println("주먹찌르기");
	}
	
}

//Archer.java --------------------------------------------------------------------------------
public class Archer extends Hero {
	public Archer(String name) {
		super(name);
	}
	public void fireArrow() {
		System.out.println("불화살!");
	}

}

//Warrior.java --------------------------------------------------------------------------------
public class Warrior extends Hero { //상속
	public Warrior(String name) {
		super(name);
	}
	public void groundCutting() {
		System.out.println("대지 가르기");
	}

}

//Wizard.java --------------------------------------------------------------------------------
public class Wizard extends Hero {
	public Wizard(String name) {
		super(name);
	}
	public void freezing() {
		System.out.println("얼리비!");
	}

}

//Main.java --------------------------------------------------------------------------------
public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Hero[] heros = new Hero[3];
		heros[0] = new Warrior("전사"); // 다형성
		heros[1] = new Archer("궁수");
		heros[2] = new Wizard("마법사");
		
		for (int i = 0; i<heros.length; i++) {
			heros[i].attack();
			if(heros[i] instanceof Warrior) {
				Warrior temp = (Warrior) heros[i]; // 잠재적 Object 상속
				temp.groundCutting();
			} else if (heros[i] instanceof Archer) {
				Archer temp = (Archer) heros[i];
				temp.fireArrow();
			} else if (heros[i] instanceof Wizard) {
				Wizard temp = (Wizard) heros[i];
				temp.freezing();
			}
			
		}
		
	}

}