题解 | 合并两个排序的链表

import java.util.*;

public class Solution {
    /**
     * 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
     *
     * 
     * @param pHead1 ListNode类 
     * @param pHead2 ListNode类 
     * @return ListNode类
     */
    public ListNode Merge (ListNode pHead1, ListNode pHead2) {
        // write code here
        if(pHead1 == null) return pHead2;
        if(pHead2 == null) return pHead1;

        ListNode head = new ListNode(0);
        ListNode cur = head;
        // 两个链表都要不为空
        while(pHead1 != null && pHead2 != null){
            if(pHead1.val <= pHead2.val){
                cur.next = pHead1;
                pHead1 = pHead1.next;
            }else{
                cur.next = pHead2;
                pHead2 = pHead2.next;
            }
            cur = cur.next;
        }
        if(pHead1 != null){
            cur.next = pHead1;
        }else{
            cur.next = pHead2;
        }

        return head.next;


    }
}