Update 0015-3sum.java

sol - list.of looks cleaner

Author: JebKlob6

java/0015-3sum.java

@@ -14,11 +14,7 @@ public List<List<Integer>> threeSum(int[] nums) {
 
                 while (left < right) {
                     if (nums[left] + nums[right] == target) {
-                        ArrayList<Integer> miniSol = new ArrayList<>();
-                        miniSol.add(nums[i]);
-                        miniSol.add(nums[left]);
-                        miniSol.add(nums[right]);
-                        sol.add(miniSol);
+                        sol.add(List.of(nums[i], nums[left], nums[right]));
                         while (left < right && nums[left] == nums[left + 1]) {
                             left++;
                         }