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());
}

}

}

[解决办法]
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);
}


}


}