merged two sorted list solved

Author: sora0319

merge-two-sorted-lists/sora0319.java

@@ -0,0 +1,39 @@
+/**
+ * Definition for singly-linked list.
+ * public class ListNode {
+ *     int val;
+ *     ListNode next;
+ *     ListNode() {}
+ *     ListNode(int val) { this.val = val; }
+ *     ListNode(int val, ListNode next) { this.val = val; this.next = next; }
+ * }
+ */
+class Solution {
+    public ListNode mergeTwoLists(ListNode list1, ListNode list2) {
+        ListNode answer = new ListNode(0, null);
+        ListNode merged = answer;
+
+        while(list1 != null || list2 != null){
+            if(list1 == null){
+                merged.next = list2;
+                break;
+            }
+            if(list2 == null){
+                merged.next = list1;
+                break;
+            }
+            if(list1.val <= list2.val){
+                merged.next = list1;
+                list1 = list1.next;
+            }
+            else{
+                merged.next = list2;
+                list2 = list2.next;
+            }
+
+            merged = merged.next;
+        }
+
+        return answer.next;
+    }
+}