The Java Tutorials have been written for JDK 8.Java教程是为JDK 8编写的。Examples and practices described in this page don't take advantage of improvements introduced in later releases and might use technology no longer available.本页中描述的示例和实践没有利用后续版本中引入的改进，并且可能使用不再可用的技术。See Java Language Changes for a summary of updated language features in Java SE 9 and subsequent releases.有关Java SE 9及其后续版本中更新的语言特性的摘要，请参阅Java语言更改。
See JDK Release Notes for information about new features, enhancements, and removed or deprecated options for all JDK releases.有关所有JDK版本的新功能、增强功能以及已删除或不推荐的选项的信息，请参阅JDK发行说明。
The Sockets Direct Protocol (SDP) provides access to high performance network connections, such as that provided by InfiniBand. 套接字直接协议（SDP）提供对高性能网络连接的访问，如InfiniBand提供的连接。This trail shows how to enable SDP, which Java APIs are involved, and explains how it works.本教程展示了如何启用SDP（涉及哪些Java API），并解释了它是如何工作的。