队列课下作业
队列课下作业
一、补充书上代码15.5
public T dequeue() throws EmptyCollectionException {
if (isEmpty()) throw new EmptyCollectionException("queue");
T result = front.getElement();
front = front.getNext();
count--;
if (isEmpty()) rear = null;
return result;
}
public T first() throws EmptyCollectionException {
if (isEmpty()) throw new EmptyCollectionException("queue");
return front.getElement();
}
public boolean isEmpty() {
return (count == 0);
}
public int size() {
return count;
}
public String toString() {
String result = "";
LinearNode<T> current = front;
while (current != null) {
result = result + (current.getElement()).toString() + "\n";
current = current.getNext();
}
return result;
}
二、单步跟踪排队情况