> For the complete documentation index, see [llms.txt](https://educacion.gitbook.io/programacion/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://educacion.gitbook.io/programacion/exercicios-java/ud4-solucions/polimorfismo.md).

# Polimorfismo

1. Instrumentos

```java
public class Instrumento {

    public void tocar() {
        System.out.println("O instrumento está a tocar");
    }

    public void afinar() {
        System.out.println("O instrumento está a afinar");
    }
}

```

```java
public class Guitarra extends Instrumento {

    @Override
    public void tocar() {
        System.out.println("A guitarra está a tocar acordes");
    }

    @Override
    public void afinar() {
        System.out.println("Afinando a guitarra");
    }
}

```

```java
public class Violin extends Instrumento {

    @Override
    public void tocar() {
        System.out.println("A guitarra está a tocar acordes");
    }

    @Override
    public void afinar() {
        System.out.println("Afinando a guitarra");
    }
}

```

```java
public class Piano extends Instrumento {

    @Override
    public void tocar() {
        System.out.println("O piano está a tocar unha melodía");
    }

    @Override
    public void afinar() {
        System.out.println("Afinando o piano");
    }
}

```

```java
import java.util.Scanner;

public class Principal {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);
        Instrumento instrumento = null;

        System.out.println("Escolle un instrumento:");
        System.out.println("1. Guitarra");
        System.out.println("2. Piano");
        System.out.println("3. Violin");
        System.out.print("Opción: ");

        int opcion = sc.nextInt();

        switch (opcion) {
            case 1:
                instrumento = new Guitarra();
                break;
            case 2:
                instrumento = new Piano();
                break;
            case 3:
                instrumento = new Violin();
                break;
            default:
                System.out.println("Opción incorrecta");
                System.exit(0);
        }

        // Uso polimórfico
        instrumento.afinar();
        instrumento.tocar();

        sc.close();
    }
}

```

2. Empregados

```java
public class Empregado {

    protected String nome;

    public Empregado(String nome) {
        this.nome = nome;
    }

    public double calcularSalario() {
        return 0;
    }

    public void mostrarFuncion() {
        System.out.println("Función xenérica");
    }
}

```

```java
public class EmpregadoXornadaCompleta extends Empregado {

    private double salarioMensual;

    public EmpregadoXornadaCompleta(String nome, double salarioMensual) {
        super(nome);
        this.salarioMensual = salarioMensual;
    }

    @Override
    public double calcularSalario() {
        return salarioMensual;
    }

    @Override
    public void mostrarFuncion() {
        System.out.println("Xornada Completa: Traballa en un departamento da empresa");
    }
}

```

```java
public class EmpregadoSustituto extends Empregado {

    private double salarioMensual;

    public EmpregadoSustituto(String nome, double salarioMensual) {
        super(nome);
        this.salarioMensual = salarioMensual;
    }

    @Override
    public double calcularSalario() {
        return salarioMensual * 0.5;
    }

    @Override
    public void mostrarFuncion() {
        System.out.println("Sustituto: Cubre as baixas dos compañeiros");
    }
}

```

```java
public class Freelance extends Empregado {

    private int horas;
    private double tarifaHora;

    public Freelance(String nome, int horas, double tarifaHora) {
        super(nome);
        this.horas = horas;
        this.tarifaHora = tarifaHora;
    }

    @Override
    public double calcularSalario() {
        return horas * tarifaHora;
    }

    @Override
    public void mostrarFuncion() {
        System.out.println("Autónomo: Participo en proxectos con complexidade elevada");
    }
}

```

```java
public class App {

    public static void main(String[] args) {

        Empregado e1 = new Empregado("Empregado Xenérico");
        Empregado e2 = new EmpregadoSustituto("Ana", 1800);
        Empregado e3 = new EmpregadoXornadaCompleta("Luis", 2200);
        Empregado e4 = new Freelance("Marta", 120, 30);

        Empregado[] empregados = { e1, e2, e3, e4 };

        for (Empregado e : empregados) {
            System.out.println("Nome: " + e.nome);
            e.mostrarFuncion();
            System.out.println("Salario: " + e.calcularSalario() + " €");
            System.out.println("----------------------------");
        }
    }
}

```


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