java collection.frequency方法

collection.frequency方法,可以统计出某个对象在collection中出现的次数
比如:
frequency(Collection<?> c, Object o)
       则在collection中,找出o的次数,比如用在统计中就很有用了,比如代码:

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@SuppressWarnings("unchecked"
public static void main(String[] args) { 
   
String text = "a r b k c d se f g a d f s s f d s ft gh f ws w f v x s g h d h j j k f sd j e wed a d f"
   
List<String> list = new ArrayList<String>(); 
list.addAll(Arrays.asList(text.split(" "))); 
   
Set<String> uniqueWords = new HashSet<String>(list); 
for (String word : uniqueWords) { 
System.out.println(word + ": " + Collections.frequency(list, word)); 

 

posted @   锐洋智能  阅读(464)  评论(0编辑  收藏  举报
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