java统计字符串单词个数的方法解析

/**    * 统计各个单词出现的次数    * @param text    */   public static void findEnglishNum(String text){    //找出所有的单词    String[] array = {".", " ", "?", "!"};    for (int i = 0; i < array.length; i++) {     text = text.replace(array[i],",");    }    String[] textArray = text.split(",");    //遍历 记录    Map<String, Integer> map = new HashMap<String, Integer>();    for (int i = 0; i < textArray.length; i++) {     String key = textArray[i];     //转为小写     String key_l = key.toLowerCase();     if(!"".equals(key_l)){      Integer num = map.get(key_l);      if(num == null || num == 0){       map.put(key_l, 1);      }else if(num > 0){       map.put(key_l, num+1);      }     }    }    //输出到控制台    System.out.println("各个单词出现的频率为：");    Iterator<String> iter = map.keySet().iterator();    while(iter.hasNext()){     String key = iter.next();     Integer num = map.get(key);     System.out.println(key + "/n/t/t" + num + "次/n-------------------");    }   }

public static void main(String[] args) {    String text = "Welcome welcome to ADempiere, a commons-based peer-production of Open Source ERP Applications. This Wiki is for the global community to contribute and share know-how and domain expertise. We hope you can find as much open information and participate in making it most usable for everyone. This project has a bazaar of Citizens with a Community Council Team which work in theFunctional Team and Technical Team along the Software Development Procedure supported and funded by the foundation ADempiere";    findEnglishNum(text);   }