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。
To use the JNDI in your program, you need to set up its compilation and execution environments.
Following are the JNDI packages:
The examples in this trail use classes and interfaces from the first two packages. You need to import these two packages into your program or import individual classes and interfaces that you use. The following two lines import all of the classes and interfaces from the two packages javax.naming and javax.naming.directory.
import javax.naming.*; import javax.naming.directory.*;
To compile a program that uses the JNDI, you need access to the JNDI classes. The Java SE 6 already include the JNDI classes, so if you are using it you need not take further actions.
To run a program that uses the JNDI, you need access to the JNDI classes and classes for any service providers that the program uses. The Java Runtime Environment (JRE) 6 already includes the JNDI classes and service providers for LDAP, COS naming, the RMI registry and the DNS .
If you are using some other service providers, then you need to download and install their archive files in the JAVA_HOME/jre/lib/ext directory, where JAVA_HOME is the directory that contains the JRE. The JNDI page lists some service providers. You may download these providers or use providers from other vendors.