Rotate a Matrix

public class MatrixUtilities {

    static int counter;
    static final String TOTAL_ITERATIONS = "\nPerformed %d swaps.";
    static final String SEPARATOR = "\n\n";

    public static void rotateCounter(int[][] a) {
        counter = 0;
        int len = a.length;
        for(int i = 0; i < (len / 2); i++) {
            for(int j = 0; j < len; j++) {
                swap(a, j, i, j, ((len-1) - i));
                counter++;
            }
        }

        for(int i = 0; i < len; i++) {
            for(int j = i; j < len; j++) {
                if(i == j) {
                    continue;
                }
                swap(a, i, j, j, i);
                counter++;
            }
        }
    }

    public static void rotate(int[][] a) {
        counter = 0;
        int len = a.length;
        for(int i = 0; i < (len / 2); i++) {
            for(int j = 0; j < len; j++) {
                swap(a, i, j, ((len-1) - i), j);
                counter++;
            }
        }

        for(int i = 0; i < len; i++) {
            for(int j = i; j < len; j++) {
                if(i == j) {
                    continue;
                }
                swap(a, i, j, j, i);
                counter++;
            }
        }
    }

    public static void swap(int[][] a, int i, int j, int x, int y) {
        int temp = a[i][j];
        a[i][j] = a[x][y];
        a[x][y] = temp;
    }

    public static void printOut(int[][] a) {
        int len = a.length;
        for(int i = 0; i < len; i++) {
            for(int j = 0; j < len; j++) {
                System.out.print(a[i][j] + " ");
            }
            System.out.println();
        }
    }

    public static void printRotateAndPrint(int[][] a, Rotation r) {
        printOut(a);
        if(r == Rotation.CLOCKWISE){
            rotate(a);
        }
        else {
            rotateCounter(a);
        }

        System.out.println("---ROTATED TO---");
        printOut(a);
        System.out.printf(TOTAL_ITERATIONS, counter);
    }

    public static enum Rotation {
        CLOCKWISE, COUNTER_CLOCKWISE;
    }

    public static void main(String[] args) {
        int[][] a = { {1,2}, {3,4}};
        printRotateAndPrint(a, Rotation.CLOCKWISE);
        System.out.println(SEPARATOR);
        int[][] b = { {1,2,3}, {4,5,6}, {7,8,9}};
        printRotateAndPrint(b, Rotation.CLOCKWISE);
        System.out.println(SEPARATOR);
        int[][] c = { {1,2,3,4}, {5,6,7,8}, {9,10,11,12}, {13,14,15,16} };
        printRotateAndPrint(c, Rotation.CLOCKWISE);
        System.out.println(SEPARATOR);
        int[][] d = { {1,2,3,4,5}, {6,7,8,9,10}, {11,12,13,14,15}, {16,17,18,19,20}, {21,22,23,24,25}};
        printRotateAndPrint(d, Rotation.CLOCKWISE);
    }

}