This is documentation for Mathematica 6, which was
based on an earlier version of the Wolfram Language.
View current documentation (Version 11.2)
JLink Guide
Java Interface
Mathematica's J/Link system provides a uniquely seamless interface to the Java environment. With J/Link you can immediately access Java classes and objects from within Mathematica without any Java programming. J/Link also provides a complete library for calling Mathematica from within Java programs.
LoadJavaClass load and set up a Java class for use from Mathematica
JavaNew create a Java object
JavaObject  ▪ JavaBlock  ▪ ...
KernelLink  ▪ MathLink  ▪ Expr  ▪ MathGraphicsJPanel  ▪ ...