java实现两个链表的数相加,两数相加 Java链表实现

定义节点

public classListNode {

public intval;

publicListNode next;

public ListNode(intx){

this.val =x;

}

}

两数相加

public class AddTwoNums {

public static void main(String[] args){

ListNode l1 = new ListNode(5);

ListNode l2 = new ListNode(5);

l1.next = new ListNode(4);

l1.next.next = new ListNode(3);

l2.next = new ListNode(6);

l2.next.next = new ListNode(4);

l2.next.next.next = new ListNode(1);

l2.next.next.next.next = new ListNode(2);

print(l1);

print(l2);

AddTwoNums addTwoNums = new AddTwoNums();

print(addTwoNums.addTwoNumbers(l1,l2));

}

public ListNode addTwoNumbers(ListNode l1,ListNode l2){

ListNode targetList = new ListNode(0);

ListNode p = l1;

ListNode q = l2;

ListNode current = targetList;

while(p != null || q != null){

int x = 0,y = 0,sum;

if (p != null) {

x = p.val;

p = p.next;

}

if (q != null) {

y = q.val;

q = q.next;

}

sum = x+y+current.val;

int carry = sum/10;

int reminder = sum%10;

current.val = reminder;

current.next = new ListNode(carry);

current = current.next;

}

current = targetList;

while (current.next.next != null){

current = current.next;

}

if (current.next.val == 0)

current.next = null;

return targetList;

}

/**

* 遍历list

* @param listNode

* @return

*/

public static ListNode print(ListNode listNode){

if (listNode != null) {

System.out.print(listNode.val +"->");

return print(listNode.next);

}

else{

System.out.println("NULL");

return null;

}

}

}