链表相加 ：7->1->6代表数字617 5—>9->2代表295 617+295 = 912 得出2->1->9 返回链表
public static Node test3(Node node1,Node node2) {
Node lastNode = null;
Node headNode = null;
int last = 0;
while (node1!=null || node2!=null) {
if (headNode == null) {
headNode = new Node((node1.value+node2.value+last)%10);
lastNode = headNode;
last = (node1.value+node2.value+last)/10;
} else {
Node node = new Node((node1.value+node2.value+last)%10);
lastNode.next = node;
lastNode = node;
last = (node1.value+node2.value+last)/10;
}
node1 = node1.next;
node2 = node2.next;
}
if (last == 1) {
lastNode.next = new Node(1);
}
return headNode;
}
