Java:
עבודה עם JSON

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.13.1</version>
</dependency>

import com.fasterxml.jackson.databind.ObjectMapper;

public class JsonExample {
    public static void main(String[] args) {
        try {
            ObjectMapper mapper = new ObjectMapper();
            Person person = new Person("Alex", 30);
            String json = mapper.writeValueAsString(person);
            System.out.println(json);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

class Person {
    public String name;
    public int age;

    public Person(String name, int age) {
        this.name = name;
        this.age = age;
    }
}

{"name":"Alex","age":30}

import com.fasterxml.jackson.databind.ObjectMapper;

public class JsonExample {
    public static void main(String[] args) {
        String json = "{\"name\":\"Alex\",\"age\":30}";
        try {
            ObjectMapper mapper = new ObjectMapper();
            Person person = mapper.readValue(json, Person.class);
            System.out.println(person.name + " בן " + person.age + " שנה.");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}