[LeetCode] 48. Rotate Imagejava

/**48. Rotate Image * @param matrix * 顺时针90旋转数组 */ public void rotate(int[][] matrix) { int len = matrix[0].length; for (int i = 0; i <= (len-1)/2; i++) { for (int j = i; j < len-1-i; j++) { int temp = matrix[i][j]; matrix[i][j] = matrix[len-1-j][i]; matrix[len-1-j][i] = matrix[len-1-i][len-1-j]; matrix[len-1-i][len-1-j] = matrix[j][len-1-i]; matrix[j][len-1-i] = temp; } } }//转圈，从最外层开始