Demonstrating the difference in order when iterating a HashSet in java 6/7 to java 8

HashSet Order

import java.util.*;

/**
 * Results :
 *
 * /usr/java/jdk1.8.0/bin/java
 * First = EEEE last = DDDD
 *
 * /usr/java/jdk1.7.0_40/bin/java
 * First = IIII last = HHHH
 *
 * /usr/java/jdk1.6.0_45/bin/java
 * First = IIII last = HHHH
 *
 *
 */
public class Test {
    public static void main(String[] args) {
        HashSet<String> strings = new HashSet<String>();

        strings.add("AAAA");
        strings.add("BBBB");
        strings.add("CCCC");
        strings.add("DDDD");
        strings.add("EEEE");
        strings.add("FFFF");
        strings.add("GGGG");
        strings.add("HHHH");
        strings.add("IIII");

        String first = null;
        String last = null;
        for(String s : strings) {
            if(first == null) {
                first = s;
            }
            last = s;
        }

        System.err.println("First = " + first + " last = " + last);
    }
}