Generating objects with a certain value within a defined distribution

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I’m having a hard time creating percentage-related goals.

What I want to do is a method that generates objects, all objects have only one attribute.

I need that 20% of the objects are generated with this attribute having as value 1 and the others having as value 2, however, I need it in a way that in my ArrayQueue those with a value of 1 and 2 are not necessarily positioned on one side of the other.

java
  • 1

    20% deterministic or random?

  • deterministic!

  • 1

    "don’t necessarily be positioned next to each other" by chance means adding objects to an array and shuffling them (Collections.shuffle())?

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If your difficulty is creating the objects, try this:

import java.util.ArrayList;

public class Porcentagem {
    private final int valor;

    public Porcentagem(int valor) {
        this.valor = valor;
    }

    public int getValor() {
        return valor;
    }

    public static void main(String[] args) {
        ArrayList<Porcentagem> q = new ArrayList<>();
        for (int i = 0; i < 100; i++) {
            q.add(new Porcentagem(i % 5 == 0 ? 1 : 2));
        }
    }
}

Basically, this algorithm repeatedly inserts an element with value 1 followed by four elements with value 2. Thus, it ensures a deterministic order where 1s will not be on each other’s side. If that’s not what you want, please explain it better.

Note: There is no class ArrayQueue in java. I just found ArrayList and ArrayDeque. I used ArrayList in the code above, but you can use the one you think best.

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