使用java标识频率计数

Question

我需要确定特定列表的频率计数。我的列表将如下所示

gun,bun 
bun,gun,
pin,bin
bin,pin
stay,way.

从上面的列表中，我需要如下输出

gun,bun  2
pin,bin  2
stay,way 1

有什么建议请提出来。

Answer 1

//this is data string
String str = "gun,bun,bun,gun,pin,bin bin,pin,stay,way";
// here we have created a map with String key and Integer values
Map<String, Integer> hm = new HashMap<String, Integer>();
//now we are iterating through each string by splitting data by "," so we'll get each string
for (String strTmp : str.split(",")) {
        //checking if map already contains the entry then update the count
        if (hm.containsKey(strTmp)) {
               Integer val = hm.get(strTmp);
               val = val + 1;
               hm.put(strTmp, val);
        } else {//else just add it
               hm.put(strTmp, 1);
        }
}
//printing the result
System.out.println(hm);

Answer 2

您还应该了解一下频率法，特别是Iterables频率法

Answer 3

使用HashMap<String,Integer>，遍历单词列表并存储计数。有关如何使用HashMap，请参阅此处的文档：

http://download.oracle.com/javase/6/docs/api/java/util/HashMap.html