从单词统计看Map
直接看代码：

String str = "Do as I say , not as I do";str = str.toLowerCase();str = str.replaceAll("[^A-Za-z]", " ");  str = str.replaceAll("\\s+", " ");String [] s =  str.split("\\s+");Map<String,Integer> hashmap = new HashMap<String ,Integer>();for(String s1 : s){String key = s1;if(hashmap.get(key)!=null){int value = ((Integer)hashmap.get(key)).intValue();value ++ ;hashmap.put(s1, value);}else{hashmap.put(s1, 1);}}for(Map.Entry entry : hashmap.entrySet()){System.out.println(entry.getKey()+": "+entry.getValue());}