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当我运行我的驱动程序类时,我的列表不会初始化。这是启动清单所必需的。初始化链表
public class SortedListReferenceBased implements ListInterface {
private Node head;
private int numItems; // number of items in list
public SortedListReferenceBased()
// creates an empty list
{
head = new Node(null);
numItems = 0;
} // end default constructor
public boolean isEmpty()
// Determines whether a list is empty
{
return true;
} // end isEmpty
public int size()
// Returns the number of items that are in a list
{
return numItems;
} // end size
public void removeAll()
// Removes all the items in the list
{
head = null;
numItems = 0;
} // end removeAll
public Object get(int index) throws ListIndexOutOfBoundsException
// Retrieves the item at position index of a sorted list, if 0 <= index <
// size().
// The list is left unchanged by this operation.
// Throws an exception when index is out of range.
{
if (index < 0 || index >= numItems) {
throw new ListIndexOutOfBoundsException(index + " is an invalid index");
}
return new Object();
}
public void add(Object item) throws ListException
// Inserts item into its proper position in a sorted list
// Throws an exception if the item connot be placed on the list
{
try {
Node newNode = new Node(item);
if (head != null) {
int i = locateIndexToAdd(item);
if (i >= -1 && i <= numItems) {
add(i, item);
}
} else {
head = new Node(newNode);
Node curr = head.getNext();
curr.setNext(null);
numItems++;
}
} catch (Exception e) {
throw new ListException("Add to List failed: " + e.toString());
}
}
}
“my list wont initialize”你是什么意思?你怎么看? – MartinS
我有一个驱动程序类,当使用时应该在Node头放置一个单词,但它给我一个错误,说它停止在添加方法 – frenzy1272
请发布堆栈跟踪 – nolexa