2D Matrix Clockwise Rotation

MatRotate.java

/**
 * Created by shail on 4/10/17.
 */
class MatRotate {
	static void toString(int[][]a, String message) {
		System.out.println(message);
		for(int i = 0; i < a.length; i++){
		    for(int j = 0; j < a[0].length; j++)
			System.out.print(a[i][j]);

		    System.out.println();
		}
    }

	static int[][] rotateRectangleMatrix(int a[][], boolean clockwise) {
		int col = a.length;
		int row = a[0].length;
		int[][] r = new int[row][col];
		for(int x = 0; x < row; x++)
		    for(int y = 0; y < col; y++)
				r[x][y] = clockwise ? a[col-1-y][x] : a[y][row-1-x];

		return r;
	}

	static int[][] transpose(int[][] a) {
		for(int i = 0; i < a.length; i++)
			for(int j = 0; j < i; j++) {
				int temp = a[i][j];
				a[i][j] = a[j][i];
				a[j][i] = temp;
			}

		return a;
	}

	static int[][] reverseEachRow(int[][] a) {
		int n = a.length;
		int m = a[0].length;

		for(int i = 0; i < n; i++)
		    for(int j = 0; j < m/2; j++){
				int temp = a[i][j];
				a[i][j] = a[i][m-1-j];
				a[i][m-1-j] = temp;
		    }

		return a;
	}

	static int[][] reverseEachCol(int[][] a) {
		int n = a.length;
		int m = a[0].length;

		for(int i = 0; i < n/2; i++)
			for(int j = 0; j < m; j++) {
				int temp = a[i][j];
				a[i][j] = a[n-1-i][j];
				a[n-1-i][j] = temp;
			}
		return a;
	}

	static int[][] rotateSquareMatrix(int[][] a, boolean clockwise) {
		a = transpose(a);
		return clockwise ? reverseEachRow(a) : reverseEachCol(a);
	}

	static int[][] rotate(int[][] a, boolean clockwise){
		return a.length == a[0].length ? rotateSquareMatrix(a, clockwise) : rotateRectangleMatrix(a, clockwise);
	}

	public static void main(String[] args) {
		int[][] a = {{1,2,3},{4, 5, 6},{7, 8, 9}};
        toString(a, "Square Matrix, Original");
        System.out.println();
        toString(rotate(a, true), "Square Matrix, Rotated clockwise");
        System.out.println();
        toString(rotate(a, false), "Square Matrix, Rotated anti-clockwise");

        System.out.println();

		int[][] b = {{1, 2}, {3, 4}, {5, 6}};
        toString(b, "Rectangle Matrix, Original");
        System.out.println();
        toString(rotate(b, true), "Rectangle Matrix, Rotated clockwise");
        System.out.println();
        toString(rotate(b, false), "Rectangle Matrix, Rotated anti-clockwise");
	}
}