NullPointerException in array

Question

I keep getting a NullPointerException at (see below). Everything works fine in C#, but in android it breaks?

arrDBNumbers is full and code is supposed to run through an

Answer 1

Because just writing

Integer[][] arrFreq = new Integer[49][2];

means you have initialized the array with all null elements because it is an array of Integer Objects and Object's default value will be null reference. Hence,

arrFreq[i][1]++;  // trying null++;

gives NullPointerException.

This wouldn't have been the case if you had used an array of primitives, which will default to an array of 0s.

int[][] arrFreq = new int[49][2];

Answer 2

Integer is a container for int, in your case you have lots of null objects. if you use int instead it will work as you expect.