15. 3Sum(java)

public class Solution15 {

	  public static List<List<Integer>> threeSum(int[] nums) {
		  int j=0,k=0;
		  Arrays.sort(nums);
		  List<List<Integer>> tol=new ArrayList<>();
		  for(int i=0;i<nums.length;i++)
		  {
			  
			  while(i>0&&i<nums.length&&nums[i]==nums[i-1])
			  {
				  i++;
			  }
			  
			  j=i+1;
			  k=nums.length-1;
			  
			  while(j<k)
			  {
				  List<Integer>  triplets=new ArrayList<>();
				  if(nums[i]+nums[j]+nums[k]==0)
				  {
					  triplets.add(nums[i]);
					  triplets.add(nums[j]);
					  triplets.add(nums[k]);
					  tol.add(triplets);
					  j++;
					  k--;
					  while(j<k&&nums[j]==nums[j-1])
					  {
						  j++;
					  }
					  while(k > j && nums[k] == nums[k+1])
	                        k --;
					  
				  }
				  else if(nums[i]+nums[j]+nums[k]>0)
				  {
					  k--;
					  while(k > j && nums[k] == nums[k+1])
	                        k--;
					  
				  }
				  else
				  {
					  j++;
					  while(j<k&&nums[j]==nums[j-1])
					  {
						  j++;
					  }
				  }
				  
				
				  
				  
			  }
			  
			  
			  
		  }
		
		  
		  return tol;
		
	        
	    }