main.java

import java.util.Arrays;

class Main {
	
  public static void main(String[] args) {
   	MedicalShifts t_harry = new MedicalShifts("harry", 0);
		MedicalShifts t_hermione = new MedicalShifts("hermione", 3);
		MedicalShifts t_ron = new MedicalShifts("ron", 1);
		MedicalShifts t_luna = new MedicalShifts("luna", 5);
		MedicalShifts t_voldemort = new MedicalShifts("voldemort", 8);

		MedicalShifts[] turnos_hogwarts = {t_harry, t_hermione, t_ron, t_luna, t_voldemort};

		for (MedicalShifts turno : turnos_hogwarts) {
			System.out.println(turno); 
		}
		System.out.println("_____________________"); 
		
		Arrays.sort(turnos_hogwarts);

		for (MedicalShifts turno : turnos_hogwarts) {
			System.out.println(turno); 
		}
		
		System.out.println("_____________________"); 
		//MedicalShift peek()
		//return turnos_hogwarts[0]
		System.out.println(turnos_hogwarts[0]);


		System.out.println("_____________________"); 
		for (MedicalShifts turno : turnos_hogwarts) {
			System.out.println(turno); 
		}

		System.out.println("_____________________"); 
		//MedicalShift pop()
		MedicalShifts to_pop = turnos_hogwarts[0];

		MedicalShifts[] turnos_hogwarts_popeado = new MedicalShifts[turnos_hogwarts.length - 1];
		for (int i = 1; i<turnos_hogwarts.length; i++){
			turnos_hogwarts_popeado[i-1] = turnos_hogwarts[i];
		}

		for (MedicalShifts turno : turnos_hogwarts_popeado) {
			System.out.println(turno); 
		}

		System.out.println("Pop: " + to_pop); 
		System.out.println("_____________________");

		//add(t_hagrid)
		
		MedicalShifts t_hagrid = new MedicalShifts("hagrid", 4);
		
		MedicalShifts[] turnos_hogwarts_add = new MedicalShifts[turnos_hogwarts_popeado.length + 1];

		for (int i = 0; i < turnos_hogwarts_popeado.length; i++){
			turnos_hogwarts_add[i] = turnos_hogwarts_popeado[i];
		}

		turnos_hogwarts_add[turnos_hogwarts_popeado.length] = t_hagrid;

		for (MedicalShifts turno : turnos_hogwarts_add) {
			System.out.println(turno); 
		}

		System.out.println("_____________________");

		Arrays.sort(turnos_hogwarts_add);

		for (MedicalShifts turno : turnos_hogwarts_add) {
			System.out.println(turno); 
		}



  }
}

MedicalShifts.java

public class MedicalShifts implements Comparable<MedicalShifts> {

	String name;
	int id;

	public MedicalShifts(String n, int i){

		this.name = n;
		this.id = i;

	}

	public String toString(){
		return this.name;
	}

	@Override
	public int compareTo(MedicalShifts otro){
		if (this.id < otro.id){
			return -1;
		}
		else if(this.id > otro.id){
			return 1;
		}
		else{
			return 0;
		}
	}

}

Queue.java

public class Queue<T>{

	T[] q = (T[]) new Comparable[0];


	public Boolean isEmpty(){
		if (q.length == 0){
			return true;
		}
		else {
			return false;
		}
	}

	public T peek(){
		return q[0];
	}

	public T pop(){
			T to_pop = q[0];

			T[] q_popeada = (T[]) new Comparable[this.q.length - 1];

			for (int i = 1; i < this.q.length; i++){
				q_popeada[i-1] = this.q[i];
			}

			this.q = q_popeada;

			return to_pop;
	}

}