1. A Java class loading device stored on a non-transitory storage device, the Java class loading device comprising: a Java runtime environment, a loading component configured to load predetermined source code written in R programming language to parse the R source code; a compiler configured to compile the parsed R source code into bytecode for at least of a first Java class corresponding to the R source code; a transfer component configured to transfer the compiled bytecode to the Java runtime environment; and a processor configured to execute the compiled bytecode of methods contained in the first Java class by a calling Java application, wherein the compiled bytecode is executed on subsequent executions without a new interpretation of the R source code in the Java runtime environment.