refactor 21

Author: fishercoder1534

src/main/java/com/fishercoder/solutions/_21.java

@@ -9,20 +9,21 @@
  * The new list should be made by splicing together the nodes of the first two lists.*/
 
 public class _21 {
-
-    public ListNode mergeTwoLists(ListNode l1, ListNode l2) {
-        if (l1 == null) {
-            return l2;
-        }
-        if (l2 == null) {
-            return l1;
-        }
-        if (l1.val < l2.val) {
-            l1.next = mergeTwoLists(l1.next, l2);
-            return l1;
-        } else {
-            l2.next = mergeTwoLists(l1, l2.next);
-            return l2;
+    public static class Solution1 {
+        public ListNode mergeTwoLists(ListNode l1, ListNode l2) {
+            if (l1 == null) {
+                return l2;
+            }
+            if (l2 == null) {
+                return l1;
+            }
+            if (l1.val < l2.val) {
+                l1.next = mergeTwoLists(l1.next, l2);
+                return l1;
+            } else {
+                l2.next = mergeTwoLists(l1, l2.next);
+                return l2;
+            }
         }
     }