[Java] 遍历HashMap和HashMap转换成List的两种方式

遍历HashMap和HashMap转换成List

 

/**
* convert the map to the list(1)
*/
public static void main(String[] args) {
   Map<String, String> maps = new HashMap<String, String>();
   maps.put("a", "aa");
   maps.put("b", "bb");
   maps.put("c", "cc");
   maps.put("d", "dd");
   maps.put("e", "ee");
   maps.put("f", "ff");

   List<String> strList = new ArrayList<String>();

   for (String str : maps.values()) {
    strList.add(str);
   }

   for (int i = 0; i < strList.size(); i++) {

    System.out.println(strList.get(i));
   }
}

 

/**
* convert the map to the list(2)
*/
public static void main(String[] args) {
   Map<String, String> maps = new HashMap<String, String>();
   maps.put("a", "aa");
   maps.put("b", "bb");
   maps.put("c", "cc");
   maps.put("d", "dd");
   maps.put("e", "ee");
   maps.put("f", "ff");

   List<String> strList = new ArrayList<String>(maps.values());

   for (int i = 0; i < strList.size(); i++) {

    System.out.println(strList.get(i));
   }
}

 

控制台输出结果：

dd

aa

cc

ff

bb

ee

(HashMap无序排列)