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。
Trail: RMI
The Java Remote Method Invocation (RMI) system allows an object running in one Java virtual machine to invoke methods on an object running in another Java virtual machine. RMI provides for remote communication between programs written in the Java programming language.
Note: If you are connecting to an existing IDL program, you should use Java IDL rather than RMI.
This trail provides a brief overview of the RMI system and then walks through a complete client/server example that uses RMI's unique capabilities to load and to execute user-defined tasks at runtime. The server in the example implements a generic compute engine, which the client uses to compute the value of 
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➤ An Overview of RMI Applications describes the RMI system and lists its advantages. Additionally, this section provides a description of a typical RMI application, composed of a server and a client, and introduces important terms.
➤ Writing an RMI Server walks through the code for the compute engine server. This section will teach you how to design and to implement an RMI server.
➤ Creating A Client Program takes a look at one possible compute engine client and uses it to illustrate the important features of an RMI client.
➤ Compiling and Running the Example shows you how to compile and to run both the compute engine server and its client.