JAVA: Prueba de filtrar por clase usando lambda de Java 8, Java

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/*
   JAVA: Prueba de filtrar por clase usando lambda de Java 8
*/
import java.util.*;
import java.lang.*;

class Rextester
{  
    public static void main(String args[])
    {
        final List<Person> lstPersons = new ArrayList<>();
        lstPersons.add(new Employee("Empleado1","Ap1",123456,"Informática",2000.50));
        lstPersons.add(new Person("Persona1","Apellido1",1));
        lstPersons.add(new Employee("Empleado2","Ap2",123457,"Contabilidad",1900.00));
        lstPersons.add(new Person("Persona2","Apellido2",2));
        lstPersons.add(new Person("Persona3","Apellido3",3));

/*Leer todas las Personas*/
        System.out.printf("%s%n%n","TODAS LAS PERSONAS:");
        lstPersons.forEach(item -> item.showData());

/*Leer los Empleados*/
        System.out.printf("%n%s%n%n","SOLAMENTE LOS EMPLEADOS:");

lstPersons.stream().filter(item -> item instanceof Employee)
            .map(item -> (Employee)item)
            .forEach(theEmployee -> theEmployee.showData()); 
        }
       
    public static  class Person {

String firstName;
        String lastName;
        int idNumber;

public Person(String firstName, String lastName, int idNumber) {
            this.firstName = firstName;
            this.lastName = lastName;
            this.idNumber = idNumber;
        }

/*... getters y setters ...*/
        
        public void showData() {
            String s = String.format("Nombre: %s%nApellido :%s%nID: %s%n%n", firstName,lastName,idNumber); 
            System.out.print(s);
        }
    }

public static class Employee extends Person {

String areaName;
        double amountSalary;

public Employee(String firstName, String lastName, int idNumber,String areaName, Double amountSalary) {
            super(firstName, lastName, idNumber);
            this.areaName = areaName;
            this.amountSalary = amountSalary;

}
        /* ...getters y setters... */

@Override
        public void showData() {
            String s = String.format("Nombre: %s%nApellido :%s%nID: %s%nÁrea :%s%nSalario :%.2f%n%n", firstName,lastName,idNumber,areaName,amountSalary); 
            System.out.print(s);

}
    }
}

[ + ] Show input
Compilation time: 0.63 sec, absolute running time: 0.24 sec, cpu time: 0.34 sec, memory peak: 25 Mb, absolute service time: 0,88 sec