class IntHolder {
    public IntHolder(int x) {
        value = x;
    }
    public int value = 0;

    @Override
    public String toString() {
        return value+"";
    }
}

public class Main {

    static void swap(IntHolder a, IntHolder b) {
        int t = a.value;
        a.value = b.value;
        b.value = t;
    }
    public static void main(String[] args) {
        IntHolder a = new IntHolder(1);
        IntHolder b = new IntHolder(0);
        swap(a,b);
        System.out.println(a+" "+b);

    }
}