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To: Jakarta Commons Users List <user@commons.apache.org>
Subject: Re: [Collections] "For each pair" iterator
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From: Agile Aspect <agile.aspect@gmail.com>
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Hi - here you go.

Note, Set is an interface so I implement it with 3 different concert
classes, namely

    HashSet
    LinkedHashSet
    TreeSet

using generics.

If you're not familiar with generics, then remove all occurences of

    <Integer>

Hope this helps.

---------------------------------------------------------------------------------------------------------
import java.util.HashSet;
import java.util.LinkedHashSet;
import java.util.Set;
import java.util.TreeSet;

public class MySet {
   
    public static void test(Set<Integer> set, String string){
        set.add(new Integer(1));
        set.add(new Integer(4));
        set.add(new Integer(2));
        set.add(new Integer(3));
        System.out.println(string+":");
        Object[] array=new Object[set.size()];   
        array=set.toArray();
        for(int i=0; i<set.size(); i++) {
            for(int j=0; j<set.size(); j++) {
                if(j > i) {
                    System.out.println(array[i]+","+array[j]);
                }
            }
        }
    }
   
    public static void main(String args[]){
        test(new HashSet<Integer>(),"HashSet");
        test(new TreeSet<Integer>(),"TreeSet");
        test(new LinkedHashSet<Integer>(),"LinkedHashSet");
    }
}

Pedro Pedruzzi wrote:
> Hi,
>
> What I'd like to do is iterate through each subset of size 2 of a Set.
>
> Example:
>
> My set is: S = {1,2,3,4}
> I'd like to iterate throught every one of these subsets:
> {1,2}, {1,3}, {1,4}, {2,3}, {2,4} and {3,4}.
>
>
>   


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