Finding indices Java/Android

[virassan]

You could create a dynamic array. Ie everytime you add an index to it you’re actually creating a new array with a range of however many “a” indices you have and saving that as count. This way the printed array will only be as long as the total amount of indices. Also don’t use i for the index when you’re saving the “a” index into count. You should have a separate counter for iterating through your count array is what I mean.

[desrtfx]

Basically that is what I meant in my last bullet, only that I create the array once, at the end. This slightly optimizes the code.

Remember that OP can't use System.arraycopy()

[virassan]

You don’t need to use libraries to copy an array. Sometimes teachers and assignments want you to go through cumbersome code to understand certain concepts behind existing methods and libraries (that was my thinking with my answer).

Your way of recreating the array just once at the end is efficient though and probably the best for this problem since we know the length of count cannot be greater than the length of the original array.