Sorting List<Map<String, Object>>

Question

I am having the below object

List<Map<String, Object>> listMap = new ArrayList<Map<String, Object>>();

How do i sort this based on the value ("Object") in the Map?

Answer 1

Create your own Comparator and use it .

List<Map<String, Object>> listMap = new ArrayList<Map<String, Object>>();
Collections.sort(listMap,new Comparator<Map<String, Object>>() {

            public int compare(Map<String, Object> o1, Map<String, Object> o2) {
                //your logic goes here
            }
});

Answer 2

使用您自己的比较器（您必须实现给定的接口）

Answer 3

One of the easiest ways to solve using Java 8 is :

Collections.sort(listMap, Comparator.comparing(map -> (String)map.get("key")));

Or,

listMap = listMap.stream().sorted(Comparator.comparing(map -> (String)map.get("key"))).collect(Collectors.toList());

Note: I have converted key(Object) into String. You can use as per your requirements.