user8833115566 :
Given the following situation:
Map<String, Object> map1 = new HashMap();
Map<String, String> map2 = new HashMap();
map2.put("Grp A", "a");
map2.put("Grp B", "b");
map1.put("Grp",map2);
How can get the "Grp A" value from map1 ?
Samuel Noyes :
Simply retrieve map2 from map1 by casting to a Map and then get the desired value from that Map:
return ((Map<String,String>)map1.get("Grp")).get("Grp A");
However, better practice would be to check that map2 isn't null before retrieving "Grp A":
Map<String,String> map = (Map<String,String>)map1.get("Grp");
if (map != null) {
return map.get("Grp A");
}
@Eran's answer would be better practice, but OP asked how to retrieve the value from the given HashMap.
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