Read hashmap with inner array of objects in java

Question

This is a result I get from a hashmap in java. How do we read this and extract value1 and value2 and put them inside another hash map? And only one array of object inside.

{
    "result": [
        {
            "desc": {
                "value1": "",
                "value2 ""
            }
        }
    ]
}

This is the method tried,

HashMap result = (HashMap) response.get("result");
HashMap desc = (HashMap) result.get("desc");
map.put("value1", desc.get("value1"));
map.put("value2", desc.get("value2"));

@azro , do u konw how to achive this? I need to get value1 and value2 from this. There is only one array of object inside. — user20848574
– user20848574, Commented Dec 23, 2022 at 16:36
Achieve what ? We don't know the initial class of response. Cas it into a List instead of a Map, and use it like a list — azro
– azro, Commented Dec 23, 2022 at 16:51
@azro this is the type of response -----> HashMap<String, Object> response — user20848574
– user20848574, Commented Dec 23, 2022 at 16:55
And what about casting it to list and use like a list then ? — azro
– azro, Commented Dec 23, 2022 at 16:56

azro · Accepted Answer · 2022-12-23 16:57:54Z

1

You're missing the List level

List<Object> result = (List<Object>) response.get("result");
HashMap<String,Object> item = (HashMap<String,Object>) result.get(0);
HashMap<String,String> desc = (<String,String>) item.get("desc");
map.put("value1", desc.get("value1"));
map.put("value2", desc.get("value2"));

answered Dec 23, 2022 at 16:57

azro

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2 Comments

user20848574 Over a year ago

Just to understand, response.get("result").get(0).get("serial").get("id") @azro is this wrong?

azro Over a year ago

@Nickjonas Does it raise an error ? If you don't cast, you have Object and you can't call the get methods

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