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。
An application runs in a platform environment, defined by the underlying operating system, the Java virtual machine, the class libraries, and various configuration data supplied when the application is launched.应用程序在平台环境中运行，平台环境由底层操作系统、Java虚拟机、类库和启动应用程序时提供的各种配置数据定义。This lesson describes some of the APIs an application uses to examine and configure its platform environment.本课程介绍应用程序用于检查和配置其平台环境的一些API。The lesson consists of three sections:本课程由三部分组成：
System and Runtime classes.System和Runtime类中定义的其他API。