KernelLink — communicate with a Wolfram Language kernel

MathLink — low-level methods for communicating with any Wolfram Symbolic Transfer Protocol (WSTP) program

MathLinkFactory — create links

MathLinkException — link errors

Monitoring Packet Flow

PacketListener, PacketArrivedEvent — respond to arrival of WSTP packets

PacketPrinter — print packet contents (useful for debugging)

Representing & Storing Expressions

Expr — Java representation of Wolfram Language expressions

LoopbackLink — temporary storage for expressions

User Interface Components

MathFrame, MathJFrame — convenience classes for Wolfram Language-aware Java windows

MathCanvas, MathGraphicsJPanel — display Wolfram Language graphics and typeset output

ConsoleWindow — display Java console output

MathSessionPane — fully functional user interface for Wolfram Language kernel sessions

InterruptDialog — user interface for interrupting computations

BracketMatcher, SyntaxTokenizer — utility classes for working with Wolfram Language input

Event Listeners

MathActionListener — call a Wolfram Language function when an ActionEvent occurs in Java

MathWindowListener — call a Wolfram Language function when a WindowEvent occurs in Java

MathAdjustmentListener  ▪  MathComponentListener  ▪  MathContainerListener  ▪  MathFocusListener  ▪  MathItemListener  ▪  MathKeyListener  ▪  MathMouseListener  ▪  MathMouseMotionListener  ▪  MathPropertyChangeListener  ▪  MathTextListener  ▪  MathVetoableChangeListener

LinkSnooper — monitor the flow of packets between two WSTP programs

MathematicaTask — Ant task for calling the Wolfram Language