0
我的代碼編譯但不起作用。我認爲我沒有說明對嗎?並可以有人向我解釋wrapIdx方法返回索引%容量。我真的不明白如何代碼包裝數組。當它到達數組索引的末尾時,容量將返回1,但不是數組從0開始索引?隊列RingBuffer實現隊列12。不起作用
這是我的代碼,我正在實現一個Queue12接口。在我得到這個工作後,我將能夠做一個測試類來檢查它是否工作?
import java.util.NoSuchElementException;
public class QueueImpl12<T> implements Queue12<T>
{
private int _size, _backIdx, _frontIdx;
private static final int _defaultCapacity = 128;
private T[] _ringBuffer;
public QueueImpl12(int capacity)
{
_ringBuffer = (T[]) new Object[capacity];
clear();
}
public QueueImpl12()
{
_ringBuffer = (T[]) new Object[_defaultCapacity];
clear();
}
private int wrapIdx(int index)
{
return index % capacity();
}
public void clear()
{
_backIdx = 0;
_frontIdx = 0;
_size = 0;
}
@Override
public int capacity()
{
// TODO Auto-generated method stub
return _ringBuffer.length;
}
@Override
public int size()
{
// TODO Auto-generated method stub
return _size;
}
@Override
public boolean enqueue(T o)
{
//add o to back of queue
if(_ringBuffer.length == _size)
{
return false;
}
_ringBuffer[_backIdx] = o;
_backIdx = wrapIdx(_backIdx + 1);
_size++;
return true;
}
@Override
public T dequeue()
{
if(_size == 0) //empty list
{
throw new NoSuchElementException();
}
T tempObj = _ringBuffer[_frontIdx]; //store frontIdx object
_ringBuffer[_frontIdx] = null;
_frontIdx++;
_size--;
return tempObj;
}
@Override
public T peek()
{
return _ringBuffer[_frontIdx];
}
}
是否與當前索引相同? – earbulan
只有當前面和當前等於'0'時 – Woot4Moo