자바의정석 Ex7_10 추상 클래스,

package Chap07;

public class Ex7_10 {
    public static void main(String() args) {
        Unit() group = { new Marine(), new Tank(), new Dropship() };

        for (int i = 0; i < group.length; i++)
            group(i).move(100, 200);
    }
}   

abstract class Unit {
    int x, y;
    
    //move라는 추상 메서드
    abstract void move(int x, int y);
    void stop() { }
}

class Marine extends Unit {
    
    //추상클래스를 완성시킴
    void move(int x, int y) {
        System.out.println("Marine(x=" + x + ",y=" + y + ")");
    }
    void stimPack() {  }
}

class Tank extends Unit { 
    void move(int x, int y) {
        System.out.println("Tank(x=" + x + ",y=" + y + ")");
    }
    void changeMode() { }
}

class Dropship extends Unit { 
    void move(int x, int y) {
        System.out.println("Dropship(x=" + x + ",y=" + y + ")");
    }
    void load()   {}
    void unload() {}
}

Unit() group = { new Marine(), new Tank(), new Dropship() };

for (int i = 0; i < group.length; i++)
    group(i).move(100, 200);