import myObject.A;
import myObject.B;

public class Java29 {
    public static void main(String[] args) {
        // A, B 클래스를 저장할 배열
        Object[] o = new Object[2];
        o[0] = new A();
        o[1] = new B();

        for (int i = 0; i < o.length; i++) {
            if (o[i] instanceof A) {
                ((A) o[i]).go();
            } else {
                ((B) o[i]).go();
            }
        }

        printGo(o);
    }

    private static void printGo(Object[] o) {
        for (int i = 0; i < o.length; i++) {
            if (o[i] instanceof A) {
                ((A) o[i]).go();
            } else {
                ((B) o[i]).go();
            }
        }
    }
}