Set inclusion in Java

Question

Can anyone show me how to write a contains method to show set inclusion. I have two HashSets s1 and s2 with elements in them I have an iterator to show the elements in each set. The next stage is to write a method that will show that s2 is included in s1. I have been told to use a contains method, any help to get me started would be very much appreciated. This is what I have so far.
import java.util.HashSet;
import java.util.Iterator;
import java.util.TreeSet;
public class Specification {
     public static void main(String[] args) {
     // Create two sets.
     HashSet s1 = new HashSet();
     s1.add("r1");
     s1.add("r2");
     s1.add("r3");
     HashSet s2 = new HashSet();
     s2.add("r1");
     s2.add("r2");
     //use iterator to retrieve elements from set S1
     Iterator it = s1.iterator();
     while(it.hasNext())
     System.out.println(it.next());

Answer 1

muj wrote:
I wanted to know how to write a contains method to show that S1 contains S2. I was hpoing somebody could help me get started on this, as in what code is required to write a contains method.For general questions like this (especially ones that appear to be homework), the best we can do is direct you to the basic tutorials.
However, if you show us where you're stuck, what you've been trying, a specific question on a specific part of Java, then we'd be happy to help.
Read also: [So, You Need to Write a Program but Don't Know How to Start|http://home.earthlink.net/~patricia_shanahan/beginner.html]
[How To Ask Questions The Smart Way|http://catb.org/esr/faqs/smart-questions.html]