◀ Prev · Parts · Full · Next ▶

JCL is almost entirely written in Java, except for the parts that need direct access to the hardware and operating system (such as for I/O or bitmap graphics), which are instead written in C++.cite-ref-1[1] The classes that give access to these functions commonly use Java Native Interface wrappers to access operating system APIs.

Almost all of JCL is stored in a single Java archive file called "rt.jar" which is provided with JRE and JDK distributions. The Java Class Library (rt.jar) is located in the default bootstrap classpathcite-ref-2[2] and does not have to appear in the classpath declared for the application. The runtime uses the bootstrap class loader to find the JCL.

◀ Prev · Parts · Full · Next ▶