Java: Appending to an array
In Java arrays can't grow, so you need to create a new array, larger array, copy over the content, and insert the new element.
Example: Append 40 to the end of arr
int[] arr = { 10, 20, 30 };
arr = Arrays.copyOf(arr, arr.length + 1);
arr[arr.length - 1] = 40;
// arr == [ 10, 20, 30, 40 ]
Apache Commons Lang
If you have Commons Lang on your class path, you can use one of the ArrayUtils.add methods.
Example: Append 40 to the end of arr
int[] arr = { 10, 20, 30 };
arr = ArrayUtils.add(arr, 40);
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