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merge2ll.java
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34 lines (33 loc) · 1.14 KB
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import java.util.*;
public class merge2ll {
public static void main(String[] args){
generateLinkedList obj = new generateLinkedList();
ListNode l1 = obj.generate(new int[]{1,2,3});
ListNode l2 = obj.generate(new int[]{1,3,4,5,6});
System.out.println(obj.show(mergeTwoLists(l1,l2)));
}
public static ListNode mergeTwoLists(ListNode l1, ListNode l2){
//可以理解了，是call by reference ! reference是地址啊
ListNode dummy = new ListNode(0);
ListNode head = dummy;
while(l1 != null || l2 != null){
if(l1 == null){
head.next = new ListNode(l2.val);
l2 = l2.next;
}else if(l2 == null){
head.next = new ListNode(l1.val);
l1 = l1.next;
}else{
if(l1.val < l2.val){
head.next = new ListNode(l1.val);
l1 = l1.next;
}else{
head.next = new ListNode(l2.val);
l2 = l2.next;
}
}
head = head.next;
}
return dummy.next;
}
}