Java TreeMap 小例子

最新推荐文章于 2024-02-08 22:22:21 发布

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最新推荐文章于 2024-02-08 22:22:21 发布

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分类专栏： Java/Scala

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本文介绍了一个使用 Java 编写的简单单词计数程序。该程序采用 TreeMap 来存储单词及其出现次数，并通过正则表达式从给定文本中分离单词。最后展示了如何遍历 Map 并打印每个单词及其对应的计数值。

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// wordcount

public static void mapTest() {
      String text = "Constructs a list containing the elements of the specified" 
          + "collection, in the order they are returned by the collection's iterator."
          + "c the collection whose elements are to be placed into this list"
          + " NullPointerException if the specified collection is null ";
      
      TreeMap<String, Integer> map = new TreeMap<String, Integer>();
      String[] words = text.split("[ \n\t\r.,;:!?(){]");
      
      for (int i = 0; i < words.length; i++) {
        String key = words[i].toLowerCase();
        if (key.length() > 0) {
          if (map.get(key) == null)
            map.put(key, 1);
          else {
            int value = map.get(key).intValue();
            value++;
            map.put(key, value);
          }
        }
      }
      Set<Map.Entry<String, Integer>> entrySet = map.entrySet();
      for (Map.Entry<String, Integer> entry: entrySet)
        System.out.println(entry.getValue() + "\t" + entry.getKey());
}