Question

我有一个包含许多重载构造函数的类。根据构造函数，可能会发生异常（当startSize或growFactor太小时）。在其他构造函数中，使用默认值，并且不会发生这些异常。

是否有可能以某种方式抑制更简单的构造函数上的警告，如下所示？我不能将它们包含在try-catch块中，因为重载的构造函数调用必须是第一次调用。

private static final int DEFAULT_STARTSIZE = 50;
private static final int DEFAULT_SCALEFACTOR = 2;

public LinkedArrayList()
{
    this(LinkedArrayList.DEFAULT_STARTSIZE, LinkedArrayList.DEFAULT_SCALEFACTOR);
}

public LinkedArrayList(T... startCollection)
{
    this(LinkedArrayList.DEFAULT_STARTSIZE, LinkedArrayList.DEFAULT_SCALEFACTOR, startCollection);
}

public LinkedArrayList(int startSize) throws InitialSizeTooSmallException
{
    this(startSize, LinkedArrayList.DEFAULT_SCALEFACTOR);
}


public LinkedArrayList(int startSize, T... startCollection) throws InitialSizeTooSmallException
{
    this(startSize, LinkedArrayList.DEFAULT_SCALEFACTOR, startCollection);
}

public LinkedArrayList(int startSize, int growFactor) throws InitialSizeTooSmallException, InitialGrowFactorTooSmallException
{
    if (startSize < 1)
        throw new InitialSizeTooSmallException();

    if (growFactor < 1)
        throw new InitialGrowFactorTooSmallException();

    this.data = new DLNodeList<T>(startSize, growFactor);
}

public LinkedArrayList(int startSize, int growFactor, T... startCollection)  throws InitialSizeTooSmallException, InitialGrowFactorTooSmallException
{
    this(startSize, growFactor);

    for (T item : startCollection)
        this.add(item);
}

Answer 1

此问题经常出现。不要在没有消息的情况下抛出特定异常，而应该使用正确的消息抛出IllegalArgumentException "Initial size is too small :" + startSize。

有关参考，请参阅ArrayList初始化：

public ArrayList(int initialCapacity) {
    super();
    if (initialCapacity < 0)
        throw new IllegalArgumentException("Illegal Capacity: "+
                                           initialCapacity);
    this.elementData = new Object[initialCapacity];
}

在重载的Java构造函数中抑制某些异常

1 个答案: