统计每个单词出现的次数

/**统计单词出现的次数
 * this is a cat and this is a mice and where is the food?
 * 思路
 * 1.分割字符串
 * 2.分拣存储
 * 3.查看单词出现的次数
 * Created by linbingdong on 16/3/19.
 */
package cn.lbd.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
public class MapDemo01 {
public static void main(String[] args){
//分割字符串
String[] arr = "this is a cat and this is a mice and where is the food?".split(" ");
//分拣存储
Map<String,Integer> map = new HashMap<String,Integer>();
for (String key : arr){
//System.out.println(key);
if(!map.containsKey(key)){ //查看是否存在单词,不存在,加入
map.put(key,1);
}else{ //存在,value+1
map.put(key,map.get(key)+1);
}
}
//3.查看单词出现的次数
Set<String> keySet = map.keySet();//将map中的key放入集合中
Iterator<String> it = keySet.iterator();//调用迭代器遍历
while (it.hasNext()){
String key = it.next();
Integer value = map.get(key);
System.out.println(key+"--->"+value);
}
}
}

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