在推土機我如何在全球範圍初始化值空對象，而不是空 對於前： Class Person
{
public Address address;
//getters and setters for address
}
Class Address
{
String addressField1;
String addressField2;
}
同樣地，我都對象PersonVO和Add
我有以下情形： Class A{
private List<Long> longList;
//getter and setter
}
Class B{
private List<C> listC;
//getter and setter
}
Class C{
private Long id;
//getter and set