Array Circulator : circulate an single dimension array with the times and the direction what you want

ArrayCirculator.java

public class c01_ArrayShifter {

	// Circulate the number in case of overflow
	private static int chk_overflow(int num, int len) {
		return num >= len ? (num - len)
			:  num <  0   ? (num + len)
			:  num;
	}

	// Circulate an array with the times and the direction what you want
	// - Object[] arr: Target Array which has a Single dimension
	// - int directionAmount: 1 = Forward, -1 = Backward
	// - int times: How many times do you want to push (Forward/Backward)
	public static Object array_shift(Object[] arr, int directionAmount, int times) {

		int currPos, nextPos;
		Object temp;
		for(int i = 0; i < times; i++) {
			for(int j = 0; j < arr.length - 1; j++) {

				// Calculate the current and next positions
				currPos = chk_overflow(   j    * directionAmount, arr.length);
				nextPos = chk_overflow((j + 1) * directionAmount, arr.length);

				// Swap the elements of the current and next positions
				temp = arr[nextPos];
				arr[nextPos] = arr[currPos];
				arr[currPos] = temp;

			}
		}

		return arr;

	}
}