Why does Java throw NullPointerException here?

Question

public class Test {

    public int [] x;

    public Test(int N)
    {
       int[] x = new int [N];
       for (int i=0;i

        

Answer 1

Inside public Test(int n):

Change

int[] x = new int [N]; // Creating a local int array x

to

x = new int [N]; // Assigning it to x