首先,我们想到是不是和 Map 中的 key 值一样有关,大家都知道 Map 的 key 值一样,会覆盖上次的相同 key 的 value 值,我们再看下面代码: Map<String, Object> map1 = new HashMap<>(); List<Map<String, Object>> list1 = new ArrayList<>(); for (int i = 0; i < 3; i++) { map1.put...
{ String a= String.valueOf( user.get(i)); boolean flag=map.containsKey(a); if(flag){ System.out.println("存在"); }else{ System.out.println("不存在"); map.put(a,"jiade"); } for (Map<String, Object> m : list) { for (String k : m.keySet()) { System.out.println(k + "...
Map<String, Object> map1 = new HashMap<>(); map1.put("111", "哈哈哈哈"); map1.put("222", "wef"); listMap.add(map1); Map<String, Object> map2 = new HashMap<>(); map2.put("111", "哈哈哈哈"); map2.put("222", "ddd"); listMap.add(map2); Map<String, Object> map...
//(赋值)最简单的一种hashMap赋值方式 List<HashMap<String, Object>> aMap= new ArrayList<HashMap<String,Object>>(); aMap.put("user","admin");//通过put加入一个键值 aMap.put("pwd","admin"); 数据的遍历 1 2 3 4 5 6 7 8 9 10 11 12 13 14 //测试遍历数据 List<HashMap<String, Ob...
ListMapString,Object》取值 List<Map<String, Object>> postlist //⼀个list⾥⾯装着多个map，如下 [{A=0100, B=4},{A=0200, B=3},{A=0300, B=2} ]for(int i = 0 ; i < postlist.size() ; i ++){ System.out.println(postlist.get(i).get("A")); //循环打印list⾥...
Object>>();Map<String,Object>map1=newHashMap<String,Object>();map1.put("name","p");map1.put("cj","5");Map<String,Object>map2=newHashMap<String,Object>();map2.put("name","h");map2.put("cj","12");Map<String,Object>map3=newHashMap<String,Object>();map3.put("name","...
details){for(Map.Entry<String,Object>entry:map.entrySet()){String key=entry.getKey();Object ...
List<Map<String, Object>> aList = new ArrayList(); Map map = new HashMap(); map.put("a",2); aList.add(map); //修改 ((Map)aList.get(0)).put("a",3);//修改值 adapter.notifyDataSetChanged();//刷新列表
可以的 ，直接给实例：public static void main(String[] args) { List<Map<String, String>>[] lists = new ArrayList[4];Map<String, String> map = new HashMap<String, String>();map.put("a", "1");map.put("b", "2");List<Map<String, String>> list = new ArrayList<Map<...
(map4);//排序前for(Map<String,Object>map:list){System.out.println(map.get("cj"));}Collections.sort(list,newComparator<Map<String,Object>>(){public intcompare(Map<String,Object>o1,Map<String,Object>o2){Integer name1=Integer.valueOf(o1.get("cj").toString());//name1是从你list里面拿...