例如，假设我有一个类测试

Private TimeToExpiry as Double
Property Let theTimeToExpiry(ByVal value as Double) 
    TimeToExpiry = value
End Property

Property Get theTimeToExpiry() As Double
    theTimeToExpiry = TimeToExpiry
End Property

然后我可以创建一个测试对象并设置TimeToExpiry的值并将其用作常规变量

Dim te as test
Set te as New test
te.TimeToExpiry = 1.0

为什么我不像这样做测试课

Public TimeToMaturity as Double

然后我还可以通过创建测试对象来设置TimeToMaturity的值

Dim te as test
Set te as New test
te.TimeToExpiry = 1.0

我的问题是它们有什么区别？为什么第一个更好？