1. 对应力扣题目连接

• 两数相加

2. 实现案例代码

public class AddingTwoNumbers {public static void main(String[] args) {// 示例用例 1ListNode l1 = new ListNode(2);l1.next = new ListNode(4);l1.next.next = new ListNode(5);ListNode l2 = new ListNode(5);l2.next = new ListNode(6);l2.next.next = new ListNode(4);ListNode s = addTwoNumbersNew(l1, l2);soutListNode(s);}public static ListNode addTwoNumbersNew(ListNode l1, ListNode l2) {ListNode dummy = new ListNode(0);ListNode current = dummy;// 用于表示进位int carry = 0;while (l1 != null || l2 != null || carry != 0) {int sum = carry;if (l1 != null) {sum += l1.val;l1 = l1.next;}if (l2 != null) {sum += l2.val;l2 = l2.next;}carry = sum / 10;current.next = new ListNode(sum % 10);current = current.next;}return dummy.next;}public static void soutListNode(ListNode l1) {if (l1 == null) {return;}System.out.println(l1.val);soutListNode(l1.next);}
}/*** 节点类*/
class ListNode {int val;ListNode next;ListNode() {}ListNode(int val) {this.val = val;}ListNode(int val, ListNode next) {this.val = val;this.next = next;}
}