Question about exercise with abstract class in Java
I would like to ask for your help again in this exercise. This time using the abstract class.
Create an abstract class
FuncionarioAbstractwith the attributeStringname and abstract method:public double getSalario();there are two classes that inherit fromFuncionarioAbstractand are concrete:AdministradorandGerente.Administradorhas a salary of 2000.Gerentealready has one more attributedouble comissaoand your salary is2500 + comissao.Create a class
Principalwith a list ofFuncionarioAbstract(creating objects of typeAdministradorandGerente) using the interfaceSetand the classHashSetof the packagejava.util. And create a methodpublic static void imprimir(Set funcionarios)by printing the name and salary of each employee.
I have done the 3 classes and I am finishing the main one, I will post the code here and I would like to know if it is correct.
Class FuncionarioAbstract:
public abstract class FuncionarioAbstract {
private String nome;
public abstract double getSalario();
public String getNome() {
return nome;
}
public void setNome(String nome) {
this.nome = nome;
}
}
Class Administrador:
public class Administrador extends FuncionarioAbstract {
public double getSalario() {
return 2000;
}
}
Class Gerente:
public class Gerente extends FuncionarioAbstract {
public double getSalario() {
return 2500 + comissao;
}
private double comissao;
public double getComissao() {
return comissao;
}
public void setComissao(double comissao) {
this.comissao = comissao;
}
}
Class Principal:
public static void main (String[] args) {
Set <FuncionarioAbstract> funcionario = new HashSet<FuncionarioAbstract>();
Gerente funcionario1 = new Gerente();
funcionario1.setNome("Ramon Oliveira");
funcionario1.setComissao(1750);
funcionario.add(funcionario1);
Administrador funcionario2 = new Administrador();
funcionario2.setNome("Eliana Franco");
funcionario.add(funcionario2);
imprimir(funcionario);
}
public static void imprimir(Set<FuncionarioAbstract> funcionario) {
for (FuncionarioAbstract f : funcionario) {
System.out.println("Nome do funcionário: " + f.getNome());
System.out.println("Salário do Funcionário: " + f.getSalario());
}
}
}
My doubt is would be how to use this Set employees to print the name and salary of employees.
4 answers
It's just you iterate the HashSet and print what you want
//Chamada do método
imprimir(fa);
//Declaração do método
public static void imprimir(Set<FuncionarioAbstract> funcionarios)
{
for (FuncionarioAbstract f : funcionarios) {
System.out.println(String.format("Nome funcionário %s", f.getNome()));
}
}
If you are using Java 8 you can iterate as follows:
public void imprimir(Set<? extends FuncionarioAbstract> funcionarios) {
funcionarios.forEach(this::imprimir);
}
And implement the method that prints individually:
private void imprimir(Funcionario funcionario) {
NumberFormat formato = NumberFormat.getCurrencyInstance();
System.out.println(funcionario.getNome() + " " + formato.format(funcionario.getSalario()));
}
You can overwrite the toString() method of the FuncionarioAbstract class. See an example in this other answer of mine . It would look like this:
@Override
public String toString() {
return getNome() + " - R$ " + getSalario();
}
So to make the method to print, it is quite easy:
public static void imprimir(Set<? extends FuncionarioAbstract> funcionarios) {
for (FuncionarioAbstract func : funcionarios) {
System.out.println(func);
}
}
You just need to overwrite the getSalario() method. It is an abstract method in FuncionarioAbstract. Class Gerente implements it one way and class Administrador implements it another.
Rewriting the toString of the FuncionarioAbstract class, just pass this lambda expression.
fa.forEach(n-> System.out.println(n));