URL stream handler service-provider class.

A URL stream handler provider is a concrete subclass of this class that has a zero-argument constructor. URL stream handler providers may be installed in an instance of the Java platform by adding them to the application class path.

A URL stream handler provider identifies itself with a provider-configuration file named java.net.spi.URLStreamHandlerProvider in the resource directory META-INF/services. The file should contain a list of fully-qualified concrete URL stream handler provider class names, one per line.

URL stream handler providers are located at runtime, as specified in the URL constructor.