JavaのGsonライブラリを使用してオブジェクトのリストをJSONに変換する

import java.util.*;
import java.util.stream.*;
import com.google.gson.*;
public class JSONConverterTest {
   public static void main( String[] args ) {
      Gson gson = new GsonBuilder().setPrettyPrinting().create();
      List list = Stream.of(new Person("Raja", "Ramesh", 30, "9959984800"),
                            new Person("Jai", "Dev", 25, "7702144400"),
                            new Person("Adithya", "Sai", 21, "7013536200"),
                            new Person("Chaitanya", "Sai", 28, "9656444150"))
                            .collect(Collectors.toList());
      System.out.println("Convert list of person objects to Json:");
      String json = gson.toJson(list); // converts to json
      System.out.println(json);
   }
}
// Person class<strong>
</strong>class Person {
   private String firstName, lastName, contact;
   private int age;
   public Person(String firstName, String lastName, int age, String contact) {
      this.firstName = firstName;
      this.lastName = lastName;
      this.age = age;
      this.contact = contact;
   }
   public String toString() {
      return "[" + firstName + " " + lastName + " " + age + " " +contact +"]";
   }
}