一个句子，找出最字符最少的关键词

 1     //一个句子，找出最字符最少的关键词，eg practice makes perfect
 2     
 3     public static void main(String[] args) {
 4         int minLen=0;
 5         String str=null;
 6         String sentence="practice makes perfect";
 7         String[] strings=sentence.split(" ");
 8         /*for(int i=0;i<strings.length;++i){
 9             System.out.println(strings[i]);
10         }*/
11         minLen=strings[0].length();
12         str=strings[0];
13         for(int i=1;i<strings.length;++i){
14             if(strings[i].length()<minLen){
15                 minLen=strings[i].length();
16                 str=strings[i];
17             }
18         }
19         System.out.println("The min keyword is "+str+"
it's length is "+str.length());
20     }
21 
22 }
运行结果
The min keyword is makes
it's length is 5

注，如果空格个数多于一个，eg. practice makes perfect

运行结果：

The min keyword is
it's length is 0

把第7行改为

String[] strings=sentence.split("\s{1,}");
或者
String[] strings=sentence.split("\s+");

就可以了，参考 http://maoa.cn/?post=406


hashmap：

 1     public static void main(String[] args) {
 2         String sentence="practice  makes perfect";
 3         String[] strings=sentence.split("\s+");
 4         HashMap<Integer,String> map = new HashMap<Integer,String>();
 5         for(int i=0;i<strings.length;++i){
 6             map.put(strings[i].length(), strings[i]);
 7         }
 8         Iterator<Entry<Integer,String>> iter=map.entrySet().iterator();
 9         Entry<Integer,String> entry=iter.next();
10         int minLen=entry.getKey();
11         String str=entry.getValue();
12         while(iter.hasNext()){
13             entry=iter.next();
14             if(entry.getKey()<minLen){
15                 minLen=entry.getKey();
16                 str=entry.getValue();
17             }
18         }
19         System.out.println("The min keyword is "+str+"
it's length is "+str.length());
20     }