什么打印出来的结果是这个呢？
什么打印出来的结果是这个呢？为什么不按照顺序打印   a     b   c   d   e   呢？？？

3526198   d
3526198   a
3526198   d
3526198   b
3526198   e

import   java.util.*;
class   Test{
public   static   void   main(String[]   args){
HashSet   hs=   new   HashSet();
hs.add( "a ");
hs.add( "b ");
hs.add( "c ");
hs.add( "d ");
hs.add( "e ");
Iterator   it=hs.iterator();
while(it.hasNext()){
System.out.print(it.hashCode()+ "   ");
System.out.println(it.next());
}

}
 
}

------解决方案--------------------
用ArryList或 LinkedList 都可以
代码如下：
import java.util.LinkedList;
public class Print {

private static LinkedList <String> linkedlist;

public static void main(String[] args){

linkedlist = new LinkedList <String> ();

linkedlist.addFirst( "a ");
linkedlist.addFirst( "b ");
linkedlist.addFirst( "c ");
linkedlist.addFirst( "d ");
linkedlist.addFirst( "e ");

while (!linkedlist.isEmpty()){

System.out.println(linkedlist.removeLast());


}


}

}
如果用ArrayList:
import java.util.ArrayList;

public class PrintStr {

private static ArrayList <String> arraylist;

public static void main(String[] args){

arraylist = new ArrayList <String> ();

arraylist.add( "a ");
arraylist.add( "b ");
arraylist.add( "c ");
arraylist.add( "d ");
arraylist.add( "e ");

for(String arr:arraylist){

System.out.println(arr);
}


}


}