java List<Map<String,Object>遍历的方法

    public static void main(String[] args) {
        List<HashMap<String, Object>> list = new ArrayList<HashMap<String,Object>>();
        
        HashMap<String, Object> map = new HashMap<String, Object>();
        map.put("1", "a");
        map.put("2", "b");
        map.put("3", "c");
        
        list.add(map);
        
        JSONObject result = new JSONObject(); //全局变量
　　　　
        JSONArray jsonArray = new JSONArray();
        for (int i = 0; i < list.size(); i++) {
            
            JSONObject jsonObj = new JSONObject();//循环体内变量
            
            
            HashMap<String, Object> m = list.get(i);
            Set<String> set = m.keySet();
            Iterator<String> it = set.iterator();
            while (it.hasNext()) {
                String key = (String) it.next();
                
                
                jsonObj.accumulate(key, m.get(key));

                System.out.println(key+"-----------key-----------"+m.get(key)+"---------value---------------"); 
            }
            jsonArray.add(jsonObj);
        }

        System.out.println(result.accumulate("test", jsonArray)+"------------jsonArray-----------------");
        
        
        System.out.println("22222222222222222222222222222222222222222222222222222222");
        
        for (HashMap<String, Object> hashMap : list) {
            for (Map.Entry<String, Object> m : hashMap.entrySet()) {
                System.out.println(m.getKey()+"------key--------"+m.getValue());
            }
        }
        
        System.out.println("3333333333333333333333333333333333333333333333");
        
        
        
        
        
        
        
    }

结果:

3-----------key-----------c---------value---------------
2-----------key-----------b---------value---------------
1-----------key-----------a---------value---------------
{"test":[{"3":"c","2":"b","1":"a"}]}------------jsonArray-----------------
22222222222222222222222222222222222222222222222222222222
3------key--------c
2------key--------b
1------key--------a
3333333333333333333333333333333333333333333333

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    public static void main(String[] args) {
        List<HashMap<String, Object>> list = new ArrayList<HashMap<String,Object>>();
        
        HashMap<String, Object> map = new HashMap<String, Object>();
        map.put("1", "a");
        map.put("2", "b");
        map.put("3", "c");
        
        HashMap<String, Object> map2 = new HashMap<String, Object>();
        map2.put("4", "d");
        map2.put("5", "e");
        map2.put("6", "f");
        
        list.add(map);
        list.add(map2);
        System.out.println(list.size()+"-------------------------");
        
        JSONObject result = new JSONObject();

        JSONArray jsonArray = new JSONArray();
        
        for (int i = 0; i < list.size(); i++) {
            
            
            HashMap<String, Object> hashMap1 = new HashMap<String, Object>();
            
            HashMap<String, Object> m = list.get(i);
            Set<String> set = m.keySet();
            Iterator<String> it = set.iterator();
            while (it.hasNext()) {
                String key = (String) it.next();
                
                
                hashMap1.put(key, m.get(key));

                System.out.println(key+"-----------key-----------"+m.get(key)+"---------value---------------"); 
            }
            jsonArray.add(hashMap1);
            System.out.println(hashMap1+"------------------------hashMap1------------------");
            
        }
        System.out.println(result.accumulate("test", jsonArray)+"------------jsonArray-----------------");
    
        
        
        System.out.println("22222222222222222222222222222222222222222222222222222222");
        
        for (HashMap<String, Object> hashMap : list) {
            for (Map.Entry<String, Object> m : hashMap.entrySet()) {
                System.out.println(m.getKey()+"------key--------"+m.getValue());
            }
        }
        
        System.out.println("3333333333333333333333333333333333333333333333");
        
        
    
        List<HashMap<String, Object>> list1 = new LinkedList<HashMap<String, Object>>();
        

        for (int i = 0; i < list.size(); i++) {
            
            HashMap<String, Object> hashMap2 = new HashMap<String, Object>();
            
            HashMap<String, Object> m = list.get(i);
            Set<String> set = m.keySet();
            Iterator<String> it = set.iterator();
            while (it.hasNext()) {
                String key = (String) it.next();
                
                
                hashMap2.put(key, m.get(key));

                System.out.println(key+"-----------key-----------"+m.get(key)+"---------value---------------"); 
            }
            list1.add(hashMap2);
            
        }
        System.out.println(list1+"------------list1-----------------");
        
        
        
        
    }

结果 :

3-----------key-----------c---------value---------------
2-----------key-----------b---------value---------------
1-----------key-----------a---------value---------------
{3=c, 2=b, 1=a}------------------------hashMap1------------------
6-----------key-----------f---------value---------------
5-----------key-----------e---------value---------------
4-----------key-----------d---------value---------------
{6=f, 5=e, 4=d}------------------------hashMap1------------------
{"test":[{"3":"c","2":"b","1":"a"},{"6":"f","5":"e","4":"d"}]}------------jsonArray-----------------
22222222222222222222222222222222222222222222222222222222
3------key--------c
2------key--------b
1------key--------a
6------key--------f
5------key--------e
4------key--------d
3333333333333333333333333333333333333333333333
3-----------key-----------c---------value---------------
2-----------key-----------b---------value---------------
1-----------key-----------a---------value---------------
6-----------key-----------f---------value---------------
5-----------key-----------e---------value---------------
4-----------key-----------d---------value---------------
[{3=c, 2=b, 1=a}, {6=f, 5=e, 4=d}]------------list1-----------------