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我如何將我的添加和刪除方法從正常鏈接轉換爲循環鏈接列表。使用這段代碼,我想我需要一個尾部引用等等?圓形列表添加和刪除方法
public void add(int index, Object item)
throws ListIndexOutOfBoundsException {
//our index needs to go in along with our stuff in item
Node temp = new Node(item);
Node current = head;
for(int i = 1; i < index && current.getNext() != null; i++)
{
current = current.getNext();
}
// set the new node's next-node reference to this node's next-node reference
temp.setNext(current.getNext());
// now set this node's next-node reference to the new node
current.setNext(temp);
// current.setPrevious();
numItems++;// increment the number of elements variable
}
public boolean remove(int index)
throws ListIndexOutOfBoundsException {
if(index < 1 || index > size())
return false;
Node current = head;
for(int i = 1; i < index; i++)
{
if(current.getNext() == null)
return false;
current = current.getNext();
}
current.setNext(current.getNext().getNext());
numItems--; // decrement the number of elements variable
return true;
} // end remove