Java for LeetCode 206 Reverse Linked List

public ListNode reverseList(ListNode head) {
if(head==null)
return null;
Stack<ListNode> stack =new Stack<ListNode>();
ListNode temp=head;
while(temp!=null){
stack.push(temp);
temp=temp.next;
}
head=stack.pop();
temp=head;
while(!stack.isEmpty()){
temp.next=stack.pop();
temp=temp.next;
}
temp.next=null;
return head;
}