The extension class loader (sun/misc/Launcher$ExtClass loader)
扩展类装入器（sun/misc/Launcher$ExtClassLoader）
To simplify the creation of the Extension class, you can extend the pre-defined superclass ExtensionImplBase, which implements some methods for you.
若要简化extension类的创建，可以扩展预定义的超类ExtensionImplBase，它已经为您实现了一些方法。
To simplify the creation of the Extension class, you can extend the pre-defined superclass ExtensionImplBase, which implements some methods for you.
若要简化extension类的创建，可以扩展预定义的超类ExtensionImplBase，它已经为您实现了一些方法。
应用推荐