import java.util.ArrayList;
import java.util.Arrays;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;

public class App {
    public static void main(String[] args) throws Exception {
        Employee emp1 = new Employee("Csendes Imre", "Szeged", 342);
        Employee emp2 = new Employee("Gépi Roland", "Szeged", 345);
        
        ArrayList<Employee> empList = new ArrayList<>();
        empList.add(emp1);
        empList.add(emp2);

        GsonBuilder builder = new GsonBuilder();
        builder.setPrettyPrinting();
        Gson gson = builder.create();
        String jsonStr = gson.toJson(empList.toArray());

        //Visszalakítás
        Employee[] empArray = gson.fromJson(jsonStr, Employee[].class);
        ArrayList<Employee> empListCopy = new ArrayList<>(Arrays.asList(empArray));

        System.out.println(empListCopy.get(0).name);
        System.out.println(empListCopy.get(1).name);
    }
}