Array of numbers with variable amount Java Android

Question

I am making a program for Android and I want to make an array of integers, but I need to define the quandity of numbers with a variable that has 3 options of values: 20, 50 and 100. I tried to use the code below:

private int[] listNumbers1 = new int[maxNumber];

    for (int number=0; number<maxNumber; number++) {

    listNumbers1[number] = number+1;

}

Answer 1

Your code will only present problems depending on where you position the variable listNumbers1.

Basically, you need to position it in the class scope if you want to keep the access modifier private, and can also put it into a method, but could no longer use the modifier private, since she now belongs to the method.

public class MainScreen extends Activity {

    private int[] listNumbers1; 

    @Override
    public void onCreate(Bundle state) {
        // super....

        int maxNumbers = 50; // Inicialize a variável aqui
        listNumbers1 = new int[maxNumbers]; // crie sua lista utilizando a referência da variável maxNumbers... que já foi inicializada

        for (int number = 0; number < maxNumbers ; number++) {
            listNumbers1[number] = number+1;
        }
    }
}

The above code should work normally. You can also create the list listNumbers1 within the method onCreate(), if you prefer it to be local. But remember that in this case, the keyword private must be removed.