Java中分拣存储的demo

//Letter.java

package yzhou.map;

/**
 * 
 * @author 洋
 *
 */
public class Letter
{
    private String name;
    private int count;
    
    public Letter()
    {
        // TODO Auto-generated constructor stub
    }

    public Letter(String name)
    {
        super();
        this.name = name;
    }
    
    public Letter(String name, int count)
    {
        super();
        this.name = name;
        this.count = count;
    }

    public String getName()
    {
        return name;
    }

    public void setName(String name)
    {
        this.name = name;
    }

    public int getCount()
    {
        return count;
    }

    public void setCount(int count)
    {
        this.count = count;
    }
        
}

MapDemo02.java

package yzhou.map;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;

/**
 * 分拣存储：1：N
 * 统计单词出现的次数
 * this is a cat and that is a mice and where is the food?
 * @author 洋
 *
 *
 *思路：
 *1.分割字符串
 *2.分拣存储
 *3.按要求查看单词出现的次数
 *
 */
public class MapDemo02
{
    public static void main(String[] args)
    {
        //1.分割字符串
        String[] arr =("this is a cat and that is a mice and where is the food ?").split(" ");
        //2.分拣存储
        Map<String, Letter> map = new HashMap<String,Letter>();
        
        for(String key:arr)
        {
            //第一次查看是否存在袋子
//            if(!map.containsKey(key)){
//                map.put(key, new Letter(key));
//            }
//            //获取袋子
//            Letter value = map.get(key);
//            value.setCount(value.getCount()+1);
            
            Letter value = map.get(key);
            if(null==value){
                value = new Letter();
                map.put(key, value);
            }
            value.setCount(value.getCount()+1);
        }
        
        
        //3。查看每个单词出现的次数
        for(String key:map.keySet())
        {
            Letter value = map.get(key);
            System.out.println(key+"-->"+value.getCount());
        }
        
        
    }
}