Question 111014 in Json Question posted in
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Json – Convert a list<Strings> into a list<MyClass> using collection’s stream

Consider this:

List<String> users = repo.findAllById(id):

And this:

Public Users{
int id;
string name;
}

The list of users contain a json of users with id and names.
My question is, how do I convert the list of strings(json) into a list of users. Thanks everyone.

Eg. of list:

[user1:
  {
    “id”: “24”,
    “name”: “name”
   }
user2:
  {
    “id”: “24”,
    “name”: “name”
   }
]
Tags:

2

Answers


  1. 0

    Is there a reason why you want the list to contain strings, and not a User object? If not, you could try this:

    List<User> users = repo.findAllById(id);
return users;
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  2. 0

    I am not quite sure how is your List<String> users data structure looks like?
    You can do the convert using as below.

    https://mvnrepository.com/artifact/org.json/json/20220924
// JSONObject dependency

<dependency>
    <groupId>org.json</groupId>
    <artifactId>json</artifactId>
    <version>20180130</version>
</dependency>


    
List<String> strUsers = repo.findAllById(id):

List<User> users = strUsers.stream().map(m => {
  JSONObject obj = new JSONObject(m);
  return new User(obj.getInt("id"), obj.getString("name"));
}).collect(Collectors.toList());

    If you would like to have an accuracy answers
    please provide more detail such

    • how you select sql ?
    • you use JDBC or JPA ?
    • how is the List users data structure?
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