refactor 24

fishercoder1534 · zhahui · commit 82f60099967d · 2019-10-26T14:34:43.000-04:00
diff --git a/src/main/java/com/fishercoder/solutions/_24.java b/src/main/java/com/fishercoder/solutions/_24.java
@@ -14,16 +14,17 @@
 
  */
 public class _24 {
-
-    public ListNode swapPairs(ListNode head) {
-        if (head == null || head.next == null) {
-            return head;
+    public static class Solution1 {
+        public ListNode swapPairs(ListNode head) {
+            if (head == null || head.next == null) {
+                return head;
+            }
+            ListNode second = head.next;
+            ListNode third = second.next;
+            second.next = head;
+            head.next = swapPairs(third);
+            return second;
         }
-        ListNode second = head.next;
-        ListNode third = second.next;
-        second.next = head;
-        head.next = swapPairs(third);
-        return second;
     }
 
 }
