抱歉,只是从我这里的问题开始:这里我正在尝试运行此方法以从双面队列(deque)中删除通用值(EltType),但我一直收到错误,我两次调用 insertFirst ,然后将值“3”两次插入到数组中,然后,当我运行 removeFirst 时,它将打印出一次“3”,然后打印出“Null”。有人能帮我吗?
class ArrayBasedDeque<EltType> {
private final int CAPACITY = 10;
private int capacity;
private int end;
private EltType deque[];
public ArrayBasedDeque() {
this.capacity = CAPACITY;
deque = (EltType[]) (new Object[capacity]);
}
public EltType removeFirst() {
EltType[] tempArray;
EltType returned = deque[0];
tempArray = (EltType[]) new Object[capacity];
for (int i=1;i<capacity;i++) {
tempArray[i-1] = deque[i];
}
deque = tempArray;
return returned;
}
public boolean isEmpty() {
return end == 0;
}
public void insertFirst(EltType first) {
if(!isEmpty()) {
EltType[] tempArray;
tempArray = (EltType[]) new Object[capacity+1];
for (int i=0;i<deque.length;i++) {
tempArray[i+1] = deque[i];
}
deque = tempArray;
}
deque[0] = first;
}
}
谢谢 :)