Add Solution2.java for 0083.Remove Duplicates from Sorted List

Author: huaxu1024

solution/0083.Remove Duplicates from Sorted List/Solution2.java

@@ -0,0 +1,21 @@
+/**
+ * Definition for singly-linked list.
+ * public class ListNode {
+ *     int val;
+ *     ListNode next;
+ *     ListNode(int x) { val = x; }
+ * }
+ */
+class Solution {
+    public ListNode deleteDuplicates(ListNode head) {
+        ListNode current = head;
+        while (current != null && current.next != null) {
+            if (current.next.val == current.val) {
+                current.next = current.next.next;
+            } else {
+                current = current.next;
+            }
+        }
+        return head;
+    }
+}