![]() ![]() ![]() They are rarely appropriate for interfaces used by a single, or small set of applications.įurthermore, since the symbols defined by installed extensions will be visible in all Java processes, care should be taken to ensure that all visible symbols follow the appropriate "reverse domain name" and "class hierarchy" conventions. Since installed extensions extend the platform's core API, use them judiciously. Whether your JRE is stand-alone or part of the JDK software, any JAR file in the lib/ext of the JRE directory is automatically treated by the runtime environment as an extension. The JRE consists of those directories within the highlighted box in the diagram. A subset of the JDK software directory tree looks like this: The JRE is a strict subset of the JDK software. The JRE is available either by itself or as part of the Java Development Kit. As its name implies, the JRE is the runtime portion of the Java Development Kit containing the platform's core API but without development tools such as compilers and debuggers. Installed extensions are JAR files in the lib/ext directory of the Java Runtime Environment (JRE™) software. ![]()
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