question: public static boolean isJarURL ( URL url ) { String protocol = url . getProtocol ( ) ; return ( URL_PROTOCOL_JAR . equals ( protocol ) || URL_PROTOCOL_ZIP . equals ( protocol ) || URL_PROTOCOL_VFSZIP . equals ( protocol ) || URL_PROTOCOL_WSJAR . equals ( protocol ) ) ; }
target:  Determine whether the given URL points to a resource in a jar file, that is, has protocol "jar", "zip", "vfszip" or "wsjar".