How to Map a JSON Array of Objects to Java POJOs?

Mapping JSON Array of Objects to Java POJOs

Converting JSON objects into corresponding Java classes is often necessary for data parsing and object manipulation. Consider the following JSON array of objects:

{
    "ownerName": "Robert",
    "pets": [
        {
            "name": "Kitty"
        },
        {
            "name": "Rex"
        },
        {
            "name": "Jake"
        }
    ]
}

Java POJO Class Mapping

To map the JSON object to a Java Plain Old Java Object (POJO) class, we need to define a POJO class with the corresponding fields:

public class Person {
    private String ownerName;
    private List<Pet> pets;

    // Getters and setters omitted for brevity
}

public class Pet {
    private String name;

    // Getters and setters omitted for brevity
}

In this mapping, the ownerName attribute of the JSON object maps to the ownerName field in the Person class. The pets attribute, which is an array of objects, maps to a list of Pet objects. Each Pet object represents a pet's name.

POJO Generation Tools

For convenience, there are online tools available that can automatically generate POJO classes based on a given JSON schema. A popular tool is www.jsonschema2pojo.org. With this tool, you can simply paste the JSON schema, select the desired options, and generate the corresponding POJO classes.

Annotation Styles

It's important to note that when using POJO generation tools, you may need to specify the desired annotation style. This depends on the library you intend to use for JSON serialization and deserialization. If your schema is simple, you can often opt for no annotations. However, more complex schemas may require specific annotations for correct mapping.

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