package com.gpdi.action; import java.util.ArrayList; import java.util.Collections; import java.util.HashMap; import java.util.List; import java.util.Map; public class WordsStatistics {     class Obj {         int count ;         Obj(int count){             this.count = count;         }     }     public List<WordCount> statistics(String word) {         List<WordCount> rs = new ArrayList<WordCount>();         Map <String,Obj> map = new HashMap<String,Obj>();         if(word == null ) {             return null;         }         word = word.toLowerCase();         word = word.replaceAll("'s", "");         word = word.replaceAll(",", "");         word = word.replaceAll("-", "");         word = word.replaceAll("\.", "");         word = word.replaceAll("'", "");         word = word.replaceAll(":", "");         word = word.replaceAll("!", "");         word = word.replaceAll("n", "");         String [] wordArray = word.split(" ");         for(String simpleWord : wordArray) {             simpleWord = simpleWord.trim();              if (simpleWord != null && !simpleWord.equalsIgnoreCase("")) {                 Obj cnt = map.get(simpleWord);                 if ( cnt!= null ) {                     cnt.count++;                 }else {                     map.put(simpleWord, new Obj(1));                 }             }         }         for(String key : map.keySet()) {             WordCount wd = new WordCount(key,map.get(key).count);             rs.add(wd);         }         Collections.sort(rs, new java.util.Comparator<WordCount>(){             @Override             public int compare(WordCount o1, WordCount o2) {                 int result = 0 ;                 if (o1.getCount() > o2.getCount() ) {                     result = -1;                 }else if (o1.getCount() < o2.getCount()) {                     result = 1;                 }else {                     int strRs = o1.getWord().compareToIgnoreCase(o2.getWord());                     if ( strRs > 0 ) {                         result = 1;                     }else {                         result = -1 ;                     }                 }                 return result;             }         });         return rs;     }           public static void main(String args[]) {         String word = "Pinterest is might be aa ab aa ab marketer's dream  - ths site is largely used to curate products " ;         WordsStatistics s = new WordsStatistics();         List<WordCount> rs = s.statistics(word);         for(WordCount word1 : rs) {             System.out.println(word1.getWord()+"*"+word1.getCount());         }     } }