java - 在 Trove HashMap 中设置默认值

Question

如何设置 TLongDoubleHashMap 集合的默认值(当键不存在时返回)。它默认返回 0，我希望它返回 NaN。

我在文档中找到了这个:

Returns the value that will be returned from get(long) or put(long, double) if no entry exists for a given key. The default value is generally zero, but can be changed during construction of the collection.

但是我没有找到在构造过程中设置该值的方法。

Answer 1

通过使用this constructor :

public TLongDoubleHashMap(int initialCapacity,float loadFactor,long noEntryKey,double noEntryValue)

例如:

TLongDoubleHashMap map = new TLongDoubleHashMap(5, 0.5f, Double.NaN, Double.NaN)