隐藏行号复制代码？这是一段程序代码。 
  1. /**
  2.  * Java 统计一个字符串中的相同单词个数
  3.  */
  4. import java.util.HashMap;

  5. import java.util.Iterator;

  6. import java.util.Map;

  7. import java.util.Map.Entry;

  8. import java.util.Set;

  10. public class CountWords {

  12. private static String sentence = "Beijing on Friday urged Washington to respect historical facts and "
  13. + "not take sides on territorial disputes in the East China Sea and South China Sea, as US Secretary "
  14. + "of State John Kerry met Chinese leaders.";

  16. public static void countWord(String str){

  17. //将字符串按照规则截取为String数组
  18. String[] strToArray = str.split("[' '|,|.]");

  19. //建立Map，存储获得的单词为Key值，出现次数为对应的Value值
  20. Map<String, Integer> strMap = new HashMap<String, Integer>();

  21. //遍历数组
  22. for(int i=0;i<strToArray.length;i++){

  23. if(" "!=strToArray[i]){

  24. if(strMap.containsKey(strToArray[i])){

  25.                     strMap.put(strToArray[i], strMap.get(strToArray[i])+1);

  26.                 }else
  27. strMap.put(strToArray[i], 1);

  28.             }

  29.         }

  30.         Set<Entry<String, Integer>> it = strMap.entrySet();

  31.         Iterator<Entry<String, Integer>> iter = it.iterator();

  32. while(iter.hasNext()){

  33.             Entry<String, Integer> end = (Entry<String, Integer>) iter.next();

  34.             System.out.println("单词"+end.getKey()+"出现的次数："+end.getValue());

  35.         }

  36.     }

  38. public static void main(String[] args) {

  39.         countWord(sentence);

  40.     }

  41. }