删除排序数组中的重复数字Ⅱ

public class Solution {
    /**
     * @param A: a array of integers
     * @return : return an integer
     */
    public int removeDuplicates(int[] nums) {
        if (nums == null) {
            return 0;
        }
        
        int index = 0;
        int i, j;
        
        for (i = 0; i < nums.length;) {
            int now = nums[i];
            for (j = i; j < nums.length; j++) {
                if (nums[j] != now) 
                    break;
                if (j - i < 2) {
                    nums[index++] = now;
                }
            }
            i = j;
        }
        
        return index;
    }
}