Listing 7 shows the vendor's Validatable interface.
清单7显示了供应商的validateAddress接口。
2
Listing 8 shows the resulting aspect where the Email object is statically enhanced to implement the vendor's Validatable interface.
清单8显示了结果方面，其中email静态地得到增强以实现供应商的Validatable接口。
3
Using fundamental object-oriented design principles, the architecture team may decide to update the Sendable interface to extend the vendor's Validatable interface.