LintCode 第452题 删除链表中的元素

public ListNode removeElements(ListNode head, int val) {
// Write your code here
ListNode node1 = head;
if(head==null){
return null;
}
while(head.next!=null){
if(head.next.val==val){
if(head.next.next!=null){
head.next = head.next.next;
}else{
head.next=null;
break;
}
}else{
head = head.next;
}
}
if(node1.val == val){
return node1.next;
}

return node1;
}