[英]add() method for a linked list
我正在尝试创建一种将节点添加到链表中的方法,但到目前为止仍未成功。 这是我的成员vars的代码:
private Object data;
private int size = 0;
private Node head = null;
private Node tail = null;
public void add(Object item){
Node temp = head;
if (head != null) {
// THIS IS THE PROBLEM SITE
while(temp.getNext()!=null){
temp=temp.getNext();
}
//set next value equal to item
Node ab = (Node) item; // It says this is an invalid cast. How do I get around this??
ab.setNext(ab);
}
else{
head = new Node(item);
}
size++;
}
这也是我的Node类供参考:
public class Node {
// Member variables.
private Object data; // May be any type you'd like.
private Node next;
public Node(Object obj) {
this.data = obj; // Record my data!
this.next = null; // Set next neighbour to be null.
}
// Sets the next neighbouring node equal to nextNode
public void setNext(Node nextNode){
this.next=nextNode;
}
// Sets the item equal to the parameter specified.
public void setItem(Object newItem){
this.data = newItem;
}
// Returns a reference to the next node.
public Node getNext(){
return this.next;
}
// Returns this node ís item.
public Object getItem() {
return this.data;
}
谢谢你的时间!
您不想将item
投射为节点,而是要创建一个新节点并将其中的data
设置为item
替换为:
Node ab = (Node) item; // It says this is an invalid cast. How do I get around this??
ab.setNext(ab);
通过这样的事情:
Node newNode = new Node();
newNode.setData(item);
temp.setNext(newNode);
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