JSONをJavaの既存のオブジェクトに逆シリアル化するにはどうすればよいですか？

import flexjson.JSONDeserializer;
public class JsonDeserializeTest {
   public static void main(String[] args) {
      Employee emp = new Employee("Adithya", "Ram", 25, 35000.00);
      System.out.println(emp);
      JSONDeserializer<Employee> deserializer = new JSONDeserializer<Employee>();
      String jsonStr =
                     "{" +
                     "\"age\": 30," +
                     "\"salary\": 45000.00" +
                     "}";
      emp = deserializer.deserializeInto(jsonStr, emp);
      System.out.println(emp);
   }
}
// Employee class
class Employee {
   private String firstName;
   private String lastName;
   private int age;
   private double salary;
   public Employee() {}
   public Employee(String firstName, String lastName, int age, double salary) {
      super();
      this.firstName = firstName;
      this.lastName = lastName;
      this.age = age;
      this.salary = salary;
   }
   public String getFirstName() {
      return firstName;
   }
   public void setFirstName(String firstName) {
      this.firstName = firstName;
   }
   public String getLastName() {
      return lastName;
   }
   public void setLastName(String lastName) {
      this.lastName = lastName;
   }
   public int getAge() {
      return age;
   }
   public void setAge(int age) {
      this.age = age;
   }
   public double getSalary() {
      return salary;
   }
   public void setSalary(double salary) {
      this.salary = salary;
   }
   public String toString() {
      return "Employee[ " +
      "firstName = " + firstName +
      ", lastName = " + lastName +
      ", age = " + age +
      ", salary = " + salary +
      " ]";
   }
}

Employee[ firstName = Adithya, lastName = Ram, age = 25, salary = 35000.0 ]
Employee[ firstName = Adithya, lastName = Ram, age = 30, salary = 45000.0 ]