Method nextPermutation

NextPermutation.java:3–15

(int[] nums)

class Solution 
{    
    public void nextPermutation(int[] nums) 
    {
       int i=nums.length-2;
        int j=0;
        while(i>=0 && nums[i]>=nums[i+1]) i--;
        if(i>=0)
        {
            j=nums.length-1;
            while(nums[j]<=nums[i]) j--;
            swap(nums,i,j);
        }
        reverse(nums,i+1,nums.length-1);
    }
    
    public static void swap(int nums[],int i,int j)
    {