how to make nested HashMap in java

Question

i'm trying to put an anonymous hashmap into another hashmap:-

Map<String, Object> requestBody=new HashMap<String, Object>();
requestBody.put("UPSSecurity", new HashMap<String, Object>().put("username","rohan"));
System.out.println(requestBody);

Output is:-

{UPSSecurity=null}

You are calling put, which returns the previous element at that key. Since the map was empty, that is null. — Jorn Vernee
– Jorn Vernee, Commented Jul 15, 2016 at 10:16

kohane15 · Accepted Answer · 2021-07-23 12:04:35Z

5

Please use this way to define your Nested Hashmap.

Map<String, Object> requestBody=new HashMap<String, Object>();
Map<String,Object> userdetails=new HashMap<String, Object>();
userdetails.put("username","rohan");
requestBody.put("UPSSecurity",userdetails );
System.out.println(requestBody);

Output:

{UPSSecurity={username=rohan}}

edited Jul 23, 2021 at 12:04

kohane15

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answered Jul 15, 2016 at 10:25

Alok Ray

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3 Comments

Rohan Dodeja Over a year ago

so if there are 10 nested hashmaps then i have to create 10 local hashmaps

swapnil kambe Over a year ago

how to extract the data of UPSSecurity

swapnil kambe Over a year ago

How to get 10 nested hashmap data

Bhavin Matreja · Accepted Answer · 2018-01-16 10:13:00Z

1

You can also do it this way.

Map<String, Object> requestBody=new HashMap<String, Object>();
requestBody.put("UPSSecurity", new HashMap<String, Object>());
requestBody.get("UPSSecurity").put("username","rohan");

answered Jan 16, 2018 at 10:13

Bhavin Matreja

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