java - for 循环内的 while 循环不起作用

Question

我有一个HashMap。

Map<String,String> lhm = new HashMap<String,String>();
lhm.put("Zara", "biu");
lhm.put("Mahnaz", "nuios");
lhm.put("Ayan", "sdfe");
lhm.put("Daisy", "dfdfh");
lhm.put("Qadir", "qwe");

我想根据属性文件中给出的顺序对该 HashMap 进行排序。实际上，该属性条目将按某种顺序具有键。我的属性条目将如下所示

seq=Ayan,Zara,Mahnaz,Qadir,Daisy

我为此所做的尝试是

Map<String,String> lhm = new HashMap<String,String>();
Properties prop=new Properties();
prop.load(new FileInputStream("D:\\vignesh\\sample.properties"));
// Put elements to the map
lhm.put("Zara", "biu");
lhm.put("Mahnaz", "nuios");
lhm.put("Ayan", "sdfe");
lhm.put("Daisy", "dfdfh");
lhm.put("Qadir", "qwe");

// Get a set of the entries
Set<Entry<String, String>> set = lhm.entrySet();
// Get an iterator
Iterator<Entry<String, String>> iter = set.iterator();
// Display elements
String sequence=prop.getProperty("seq");
System.out.println("sequence got here is "+sequence);
String[] resultSequence=sequence.split(",");

for(int j=0;j<resultSequence.length;j++)
{
   while(iter.hasNext()) {

     Map.Entry me = (Map.Entry)iter.next();
     String res=(String) me.getKey();

     if(res.equals(resultSequence[j]))
     {
       System.out.println("values according with the sequence is "+lhm.get(resultSequence[j]));
     }   
   }
}

我得到的输出是

sequence got here is Ayan,Zara,Mahnaz,Qadir,Daisy
values according with the sequence is sdfe

我的预期输出是

values according with the sequence is sdfe
values according with the sequence is biu
values according with the sequence is nuios
values according with the sequence is qwe
values according with the sequence is dfdfh

它正在我的 for 循环中的第一次迭代中工作。之后它也从我的 for 循环中退出。我在这里缺少什么？谢谢您的阅读。

Answer 1

它不起作用，因为您从未重置迭代器。您仅在第一次运行时匹配该字符串。尝试将迭代器放入循环中，以便为每次迭代获取一个新的迭代器，如下所示:

for(int j=0;j<resultSequence.length;j++)
{
     Iterator<Entry<String, String>> iter = set.iterator();
     while(iter.hasNext()) {
       ....
     }
}