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Trail: Essential Classes
Lesson: The Platform Environment
Section: Configuration Utilities
The Platform Environment
Configuration Utilities
Properties
Command-Line Arguments
Environment Variables
Other Configuration Utilities
System Utilities
Command-Line I/O Objects
System Properties
The Security Manager
Miscellaneous Methods in System
PATH and CLASSPATH
Questions and Exercises
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Other Configuration Utilities

> Here is a summary of some other configuration utilities.

> The Preferences API allows applications to store and retrieve configuration data in an implementation-dependent backing store. Asynchronous updates are supported, and the same set of preferences can be safely updated by multiple threads and even multiple applications. For more information, refer to the Preferences API Guide.

> An application deployed in a JAR archive uses a manifest to describe the contents of the archive. For more information, refer to the Packaging Programs in JAR Files lesson.

> The configuration of a Java Web Start application is contained in a JNLP file. For more information, refer to the Java Web Start lesson.

> The configuration of a Java Plug-in applet is partially determined by the HTML tags used to embed the applet in the web page. Depending on the applet and the browser, these tags can include `<applet>`, `<object>`, `<embed>`, and `<param>`. For more information, refer to the Applets lesson.

> The class `java.util.ServiceLoader` provides a simple service provider facility. A service provider is an implementation of a service — a well-known set of interfaces and (usually abstract) classes. The classes in a service provider typically implement the interfaces and subclass the classes defined in the service. Service providers can be installed as extensions (see The Extension Mechanism). Providers can also be made available by adding them to the class path or by some other platform-specific means.

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