旋转图像

public class p48 {
	public void swap(int[][] matrix, int x1, int x2, int y1, int y2) {
		int temp = matrix[x1][y1];
		matrix[x1][y1] = matrix[x2][y2];
		matrix[x2][y2] = temp;
	}

	public void swapLine(int[][] matrix, int l1, int l2) {
		for (int i = 0; i < matrix.length; ++i) {
			swap(matrix, l1, l2, i, i);
		}
	}

	/**
	 * 
	 * 
	 * @param matrix
	 */
	public void rotate(int[][] matrix) {
		for (int i = 0; i < matrix.length / 2; ++i) {
			swapLine(matrix, i, matrix.length - i - 1);
		}
		for (int i = 0; i < matrix.length; ++i) {
			for (int j = i + 1; j < matrix.length; ++j) {
				swap(matrix, i, j, j, i);
			}
		}
	}

}