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。
SDP support is essentially a TCP bypass technology.
When SDP is enabled and an application attempts to open a TCP connection, the TCP mechanism is bypassed and communication goes directly to the IB network. For example, when your application attempts to bind to a TCP address, the underlying software will decide, based on information in the configuration file, if it should be rebound to an SDP protocol. This process can happen during the binding process or the connecting process (but happens only once for each socket).
There are no API changes required in your code to take advantage of the SDP protocol: the implementation is transparent and is supported by the classic networking (java.net) and the New I/O (java.nio.channels) packages. See the Supported Java APIs section for a list of classes that support the SDP protocol.
SDP support is disabled by default. The steps to enable SDP support are: