Trying to create a loop that stores x variables of a class I created

Question

I created the class Dice. To create a new Dice with 6 sides, I do
Dice name = new Dice(6); Next, I have the class DiceN which is supposed to create N dices and store them inside an array or ArrayList. The constructor of DiceN´s takes in a number n that the constructor uses to create n dices. This is what I´d like the class DiceN to be like:
import java.util.*;  // to use ArrayList
public class DiceN {
  ArrayList dices = new ArrayList(); // holds all the dices the constructor will construct
  public DiceN( int n ) { // the constructor that creates n dices
    for ( int i = 0; i < n; i++ ) {
      Dice x_i = new Dice(6); // if n = 3, the variables x_0, x_1 and x_2 will be created: 3 dices with 6 sides each
      dices.add(x_i); // each time a dice is created it is stored in the arrayList for further usage
}Obviously, one can´t dynamically create instances of Dice by using the code in the for loop, but how can I create n many dices and store them into the ArrayList, or even better, in an array without knowing beforehand how many dices will be constructed?

Answer 1

Dice x_i = new Dice(6); // if n = 3, the variables x_0, x_1 and x_2 will be created: 3 dices with 6 sides eachOffcourse instances with names like x_0, x_1 and x_2 are not created here. But Different instances are indeed created, each time having same name x_i ( there is no relation between 'i' in x_i and 'i' in for loop, so x_0, x_1, etc won't be created).
Here new Dice(6) will each time create new instances, so it serves the purpose as required by you.
For your better understanding try running below sample code and see value of 'a' is different for each instance because they indeed different instances stored in ArrayList:
import java.util.ArrayList;
public class DiceCheck
     public static void main(String[] args)
          DiceN diceN = new DiceN(3);
          diceN.showDices();
class Dice
     int sides;
     int a=0;
     public Dice(int sides)
     this.sides = sides;
     public int getA()
          return a;
     public void setA(int a)
          this.a = a;
class DiceN
     ArrayList dices = new ArrayList();
     public DiceN(int n)
          for(int i=0;i<n;i++)
               Dice x_i = new Dice(6);
               x_i.setA(i);
               dices.add(x_i);
     public void showDices()
          for(int i=0;i<dices.size();i++)
               Dice x_i = (Dice)dices.get(i);
               System.out.println(x_i.getA());
}