Method 1: Manual Parsing

import org.json.JSONObject;

public class ManualParsingExample {
    public static void main(String[] args) {
        // Sample JSON data
        String json = "{\"name\":\"John\",\"age\":30,\"city\":\"New York\"}";

        // Manual parsing using JSONObject
        JSONObject jsonObject = new JSONObject(json);
        String name = jsonObject.getString("name");
        int age = jsonObject.getInt("age");
        String city = jsonObject.getString("city");

        // Create Java object
        Person person = new Person(name, age, city);

        // Output
        System.out.println(person);
    }
}

Output:

Person{name='John', age=30, city='New York'}

Method 2: Jackson Library

import com.fasterxml.jackson.databind.ObjectMapper;

public class JacksonExample {
    public static void main(String[] args) throws IOException {
        // Sample JSON data
        String json = "{\"name\":\"John\",\"age\":30,\"city\":\"New York\"}";

        // Using Jackson for JSON to Object conversion
        ObjectMapper objectMapper = new ObjectMapper();
        Person person = objectMapper.readValue(json, Person.class);

        // Output
        System.out.println(person);
    }
}

Output:

Person{name='John', age=30, city='New York'}

Method 3: Gson Library

import com.google.gson.Gson;

public class GsonExample {
    public static void main(String[] args) {
        // Sample JSON data
        String json = "{\"name\":\"John\",\"age\":30,\"city\":\"New York\"}";

        // Using Gson for JSON to Object conversion
        Gson gson = new Gson();
        Person person = gson.fromJson(json, Person.class);

        // Output
        System.out.println(person);
    }
}

Output:

Person{name='John', age=30, city='New York'}

Method 4: JSON-B (Java API for JSON Binding)

import javax.json.bind.Jsonb;
import javax.json.bind.JsonbBuilder;

public class JsonbExample {
    public static void main(String[] args) {
        // Sample JSON data
        String json = "{\"name\":\"John\",\"age\":30,\"city\":\"New York\"}";

        // Using JSON-B for JSON to Object conversion
        Jsonb jsonb = JsonbBuilder.create();
        Person person = jsonb.fromJson(json, Person.class);

        // Output
        System.out.println(person);
    }
}

Output:

Person{name='John', age=30, city='New York'}