gistfile1.txt

public static void rotateMatrixByElement(int[][] matrix){
		int num = matrix.length;
		for(int i=0; i<num/2; i++){
			int start = matrix[i][i];
			//shift up on column i
			for(int row=i; row<num-i-1; row++){
				matrix[row][i] = matrix[row+1][i];
			}
			//shift left on row num-i-1
			for(int col=i; col<num-i-1; col++){
				matrix[num-i-1][col] = matrix[num-i-1][col+1];
			}
			//shift down on column num-i-1
			for(int row=num-i-1; row>i; row--){
				matrix[row][num-i-1] = matrix[row-1][num-i-1];
			}
			//shift right on row i
			for(int col=num-i-1; col>i; col--){
				matrix[i][col] = matrix[i][col-1];
			}
			//the last one!
			matrix[i][i+1] = start;
		}
		
		for(int i=0; i<num; i++)
			System.out.println(Arrays.toString(matrix[i]));
	}

Rotate matrix