java List<Map<String,Object>遍历的方法

java List<Map<String,Object>遍历的方法

 

public class Test {
    public static void main(String[] args) {

        List<Map<String, Object>> listMaps = new ArrayList<Map<String, Object>>();
        
        Map<String, Object> map1 = new HashMap<String, Object>();
        map1.put("1", "a");
        map1.put("2", "b");
        map1.put("3", "c");
        listMaps.add(map1);

        Map<String, Object> map2 = new HashMap<String, Object>();
        map2.put("11", "aa");
        map2.put("22", "bb");
        map2.put("33", "cc");
        listMaps.add(map2);

        for (Map<String, Object> map : listMaps) {
            for (String s : map.keySet()) {
                System.out.print(map.get(s) + "  ");
            }
        }
        System.out.println();
        System.out.println("========================");

---------------------------------8888888888888888888888888----------------------------------------

        for (int i = 0; i < listMaps.size(); i++) {
            Map<String, Object> map = listMaps.get(i);
            Iterator iterator = map.keySet().iterator();
            while (iterator.hasNext()) {
                String key= (String) iterator.next();
                System.out.println(map.get(key));
            }
        }
        System.out.println("++++++++++++++++++++++++++++");


---------------------------------8888888888888888888888888----------------------------------------


        for (Map<String, Object> map : listMaps) {
            for (Map.Entry<String, Object> m : map.entrySet()) {
                System.out.print(m.getKey() + "    ");
                System.out.println(m.getValue());
            }
        }
        System.out.println("-----------------------------");
    }

}


打印的结果：

c  b  a  bb  cc  aa  
========================
c
b
a
bb
cc
aa
++++++++++++++++++++++++++++
3    c
2    b
1    a
22    bb
33    cc
11    aa
-----------------------------