Java map存放数组并取出值代码详解

package com.sort; 
import java.util.ArrayList; 
import java.util.Collections; 
import java.util.Comparator; 
import java.util.HashMap; 
import java.util.List; 
import java.util.Map; 
import java.util.Map.Entry; 
public class Test { 
  public static void main(String[] args) { 
    Map<String,String> map = new HashMap<String,String>(); 
    map.put("b","4"); 
    map.put("a","5"); 
    map.put("c","3"); 
    map.put("d","5"); 
    //通过map.keySet()方法 
    //方法一：通过得到key的值，然后获取value; 
    /*for(String key : map.keySet()){ 
      String value = map.get(key); 
      System.out.println(key+" "+value); 
    }*/ 
    //使用迭代器，获取key; 
    /*Iterator<String> iter = map.keySet().iterator(); 
    while(iter.hasNext()){ 
      String key=iter.next(); 
      String value = map.get(key); 
      System.out.println(key+" "+value); 
    }*/ 
    //通过map.entrySet()方法 
    //方法一：循环map里面的每一对键值对，然后获取key和value 
    /*for(Entry<String, String> vo : map.entrySet()){ 
      vo.getKey(); 
      vo.getValue(); 
      System.out.println(vo.getKey()+" "+vo.getValue()); 
    }*/ 
    /*//使用迭代器，获取key 
    Iterator<Entry<String,String>> iter = map.entrySet().iterator(); 
    while(iter.hasNext()){ 
      Entry<String,String> entry = iter.next(); 
      String key = entry.getKey(); 
      String value = entry.getValue(); 
      System.out.println(key+" "+value); 
    }*/ 
    //将map<String,String> 转化为ArryList,但list里面的元素为Entry<String,String> 
    List<Entry<String,String>> list = new ArrayList<Map.Entry<String,String>>(map.entrySet()); 
    Collections.sort(list,new Comparator<Entry<String,String>>(){ 
      @Override 
      public int compare(Entry<String, String> o1, 
          Entry<String, String> o2) { 
        int flag = o1.getValue().compareTo(o2.getValue()); 
        if(flag==0){ 
          return o1.getKey().compareTo(o2.getKey()); 
        } 
        return flag; 
      } 
    }); 
    //遍历list得到map里面排序后的元素 
    for(Entry<String, String> en : list){ 
      System.out.println(en.getKey()+" "+en.getValue()); 
    } 
  } 
} 

c 3
b 4
a 5
d 5