Rotate Matrix 90°

package testproj.uebung;

public class Problem6 {

    private static final int[][] INPUT = {
            { 1, 2, 3, 4 },
            { 5, 6, 7, 8 },
            { 9, 10, 11, 12 },
            { 13, 14, 15, 16 }
    };

    public static void main(String[] args) {
        print(INPUT);
        // iterate though top

        for (int ring = 0; ring < Math.floor(INPUT.length / 2); ring++) {

            // shift north
            int workRowStart = ring;
            int workRowEnd;
            int workColStart = ring;
            int workColEnd = INPUT.length - ring;
            int temp = INPUT[workRowStart][workColStart];
            for (int col = workColStart; col < workColEnd; col++) {
                int original = INPUT[workRowStart][col];
                INPUT[workRowStart][col] = temp;
                temp = original;
            }
            // shift east
            workRowStart = ring + 1;
            workRowEnd = INPUT.length - ring;
            workColStart = INPUT[ring].length - ring - 1;
            for (int row = workRowStart; row < workRowEnd; row++) {
                int original = INPUT[row][workColStart];
                INPUT[row][workColStart] = temp;
                temp = original;
            }
            // shift south
            workRowStart = INPUT.length - ring - 1;
            workColStart = INPUT[ring].length - ring - 2;
            workColEnd = ring;
            // we need to move from right to left here
            for (int col = workColStart; col >= workColEnd; col--) {
                int original = INPUT[workRowStart][col];
                INPUT[workRowStart][col] = temp;
                temp = original;
            }
            // shift west
            // we need to shift from bot to top
            workRowEnd = ring;
            workRowStart = INPUT.length - ring - 1;
            workColStart = ring;
            for (int row = workRowStart; row >= workRowEnd; row--) {
                int original = INPUT[row][workColStart];
                INPUT[row][workColStart] = temp;
                temp = original;
            }
        }

        print(INPUT);
    }

    public static void print(int[][] input) {
        System.out.println("---------------------------------");
        for (int idxa = 0; idxa < input.length; idxa++) {
            System.out.print("|");
            for (int idxb = 0; idxb < input[idxa].length; idxb++) {
                System.out.printf("%d \t| ", input[idxa][idxb]);
            }
            System.out.println("");
        }
        System.out.println("---------------------------------");
    }
}