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J/Link User Guide—Wolfram Documentation

J/Link User Guide—Wolfram Documentation WOLFRAM Products

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Learning & Support Get Started More Learning Grow Your Skills Tech Support Company Work with Us Educational Programs for Adults Educational Programs for Youth Read Educational Resources Wolfram Initiatives Events Wolfram|Alpha Wolfram Cloud Your Account Search Navigation Menu Wolfram Language & System Documentation Center J/Link User Guide JLINK OVERVIEW J/Link User Guide Introduction to J/Link J/Link and WSTP Calling Java from the Wolfram Language J/Link Basics Preamble Loading the J/Link Package Launching the Java Runtime InstallJava Controlling the Command Used to Launch Java Overriding the Class Path Loading Classes LoadJavaClass When to Call LoadJavaClass Contexts and Visibility of Static Members Inner Classes Conversion of Types between Java and the Wolfram Language Creating Objects Calling Methods and Accessing Fields Syntax Underscores in Java Names Getting Information about Classes and Objects Quitting or Restarting Java Version Information Advanced Topics in J/Link Controlling the Class Path: How J/Link Finds Classes The Java Class Path Overriding the Startup Class Path Dynamically Modifying the Class Path Examining the Class Path Using J/Link's Class Loader Directly Performance Issues Overhead of Calls to Java Speeding Up Sending Large Arrays An Optimization Example Reference Counts and Memory Management Object References in the Wolfram Language ReleaseJavaObject JavaBlock PeekObjects and PeekClasses Exceptions How Exceptions Are Handled The JavaThrow Function Returning Objects "by Value" and "by Reference" References and Values ReturnAsJavaObject JavaObjectToExpression MakeJavaObject and MakeJavaExpr Preamble MakeJavaObject MakeJavaExpr Creating Windows and Other User Interface Elements Preamble Interactive and Non-Interactive Interfaces Modal versus Modeless Operation Handling Events with Wolfram Language Code: The "MathListener" Classes Bringing Java Windows to the Foreground Modal Windows MathFrame and MathJFrame Modeless Windows: Sharing the Kernel with Java Sharing the Front End Summary of Modal and Modeless Operation "Manual" Interfaces: The ServiceJava Function Using a GUI Builder Drawing and Displaying Wolfram Language Images in Java Windows The MathCanvas and MathGraphicsJPanel Classes Showing Wolfram Language Graphics and Typeset Expressions Drawing Using Java's Graphics Functions Bitmaps The Java Console Window Using JavaBeans Hosting Applets Periodical Tasks Some Special Number Classes Preamble The "Wrapper" Classes: Integer, Float, Boolean, and Others Complex Numbers BigInteger and BigDecimal Ragged Arrays Implementing a Java Interface with Wolfram Language Code Writing Your Own Installable Java Classes Preamble Installable Functions—The Old Way Installable Functions in Java Setting Up Definitions in the Wolfram Language When Your Class Is Loaded Manually Returning a Result to the Wolfram Language Requesting Evaluations by the Wolfram Language Throwing Exceptions Making a Method Interruptible Writing Your Own Event Handler Code Debugging Your Java Classes Deploying Applications That Use J/Link Coding Tips Example Programs Introduction A Beep Function Formatting Dates A Progress Bar A Simple Modal Input Dialog A File Chooser Dialog Box Sharing the Front End: Palette-Type Buttons Real-Time Algebra: A Mini-Application GraphicsDlg: Graphics and Typeset Output in a Window BouncingBalls: Drawing in a Window Spirograph A Piano Keyboard Writing Java Programs That Use the Wolfram Language Introduction What Is WSTP? Overview of the Main J/Link Interfaces and Classes Preamble MathLink and KernelLink MathLinkFactory MathLinkException Expr PacketListener High-Level User Interface Classes Sample Program Creating Links with MathLinkFactory Using Listen and Connect Modes Using a Remote Kernel The MathLink Interface Managing Links Packet Functions Error Handling Link State Putting Getting Messages Marks Complex Class Yield and Message Handlers Constants The KernelLink Interface Evaluate Waiting for the Result The "evaluateTo" Methods Sending Java Object References Interrupting, Aborting, and Abandoning Evaluations Support for PacketListeners The handlePacket() Method (Advanced Users Only) Methods Valid Only for "StdLinks" Sending Computations and Reading Results WSTP Packets The WSTP "Packet Loop" Sending an Evaluation Reading the Result The "evaluateTo" Methods Using the PacketListener Interface The PacketPrinter Class for Debugging Using EnterTextPacket Handling MathLinkExceptions Graphics and Typeset Output Preamble MathCanvas and MathGraphicsJPanel A Sample Program That Displays Graphics and Typeset Results evaluateToImage() and evaluateToTypeset() Aborting and Interrupting Computations Using Marks Using Loopback Links Using Expr Objects Motivation for the Expr Class Methods in the MathLink Interface for Reading and Writing Exprs Exprs as Replacements for Loopback Links Exprs as a Means to Get String Representations of Expressions Exprs as Arguments to KernelLink Methods Examining and Manipulating Exprs Disposing of Exprs Threads, Blocking, and Yielding Sending Object References to the Wolfram Language Some Special User Interface Classes Introduction ConsoleWindow MathSessionPane BracketMatcher and SyntaxTokenizer InterruptDialog Writing Applets Top

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