Calculo2

package javaapplication2;

import java.util.ArrayList;
import java.util.Random;


public class Calculo {

    private ArrayList lista = new ArrayList();
    private Random rand = new Random();
    private int size;

    public void crearTamanio(){
        size = rand.nextInt(99) + 1;
    }
    public void llenar(){
        for (int lista = 0; lista < size; lista++){
            this.lista.add(rand.nextInt(99));
        }
    }
    public int suma(){
        int suma = 0;
        for (int lista =0; lista < size ; lista ++){
            suma  = Integer.parseInt(this.lista.get(lista).toString());
       }
     return suma;
    }

    public int mediana(){
       int mediana;



    public float promedio(){
        return(this.suma()/size);
    }

    public static void main(String[] args) {

        Calculo a = new Calculo();
        a.crearTamanio();
        a.llenar();
        a.suma();
        a.promedio();
        System.out.println("Suma"+a.suma());
        System.out.println("promedio"+a.promedio());
    }

}