import java.util.*;

class HW3Q {
    public static void main(String[] args) {

        LinkedList<Integer> lst1 = new LinkedList<Integer>();
        LinkedList<IntHolder> lst2 = new LinkedList<IntHolder>();

        lst1.add(1);
        lst1.add(4);
        lst1.add(9);

        System.out.println(lst1.contains(new Integer(4)));

        lst2.add(new IntHolder(1));
        lst2.add(new IntHolder(4));
        lst2.add(new IntHolder(9));

        System.out.println(lst2.contains(new IntHolder(4)));
    }
}

class IntHolder {
    int i;
    public IntHolder(int i1) {
        i = i1;
    }
}