move zeroes

Given an array nums, write a function to move all 0’s to the end of it while maintaining the relative order of the non-zero elements.
For example, given nums = [0, 1, 0, 3, 12], after calling your function, nums should be [1, 3, 12, 0, 0].
Note:
1.You must do this in-place without making a copy of the array.
2.Minimize the total number of operations

给定一个数组，把所有0移到数组末尾，同时保证非0数的相对顺序不变。不能使用额外的空间，且保证操作次数最小。 比如，数组[0,1,0,3,12]，处理后得到的结果应该为[1,3,12,0,0]。

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public class  {
    public void moveZeroes(int[] nums) {
        int index = 0;
        for (int i=0;i<nums.length;i++) {
            if (nums[i]!=0) {
                nums[index] = nums[i];
                index++;
            }
        }
        for (int i=index;i<nums.length;i++) {
            nums[i] = 0;
        }
    }
}