Instead of: public int[] filterEven(int[] array) { aggregator = int[array.size()] for(int i: array) { int aggregatorSize = 0; // The n

Instead of: public int[] filterEven(int[] array) { aggregator = int[array.size()] for(int i: array) { int aggregatorSize = 0; // The next line is the only unique part of // this function! if(array[i] % 2 == 0) { // Someone please tell me there's an easier way // to append to an array than this aggregator[aggregatorSize] = array[i]; aggregatorSize += 1; } } } int[] array = { 1, 2, 3, 4, 5, 6 }; filterEven(array); // => { 2, 4, 6 } in Java, you'd normally use collections and not arrays. So it'd be: List<Integer> result = new ArrayList<Integer>(); for(int i : argument) if(i%2==0) result.add(i); So it's really 2 lines, not 7. And if you really needed to work on an argument passed in the form of a primitive array, you'd use Arrays.asList(arrayArgument) to easily turn the array into a list. Java really shines when you are doing multithreaded code because you have a rich set of thread safe collections. (e.g. multiple simultaneous requests in a web app all modifying shared data structures). With reading something into a file, anyone that does this often will just use a library (either their own or a 3rd party one). Thus, they'd just do: String data = FileUtil.readFile("abc.txt");