Thus, when you call a method that takes a double[], you might pass it {1.0,2.0,N[Pi],1.23}. (One important exception to this rule is that because it is comparatively slow to call into Java from the Wolfram Language, you might need to design your classes in a way that will not require an excessive number of method calls from the Wolfram Language to get the job done.
When you call UnshareKernel, you pass it the token to "unregister" that particular request for sharing.
In cases where it does not, the call will fail with an error message, and you will have to use the Wolfram Language's N function to convert all integers to reals explicitly. You must not call setModal if you are not using DoModal. The method message() performs all the steps of issuing a Wolfram System message. The internal J/Link code that wraps all method calls will handle the cleanup and recovery from any WSTP error that might have occurred calling putSymbol(). Manually returning a result bypasses the normal result-handling routines in J/Link, so there is no chance for the ReturnAsJavaObject request to be accommodated. ShareFrontEnd currently does not work with a remote kernel; the same machine must be running the kernel and the front end. To understand the MakeJavaExpr function, you need to understand the motivation for J/Link's Expr class, which is discussed in detail in "Motivation for the Expr Class". You would have to write some Java code by hand, as the code's logic is more complex than can be handled by graphical tools for creating event handlers. This functionality is extremely useful because it greatly extends the set of programs you can write purely in the Wolfram Language, without resorting to writing your own Java classes. In such cases, use a MathFrame or MathJFrame as your top-level window and use its onClose() method to specify Wolfram Language code that releases all outstanding objects and unregisters kernel or front end sharing you may have used. It uses the Java Graphics2D API, so it will not run on systems that have only a Java 1.1.x runtime. At some point, you probably want an actual Wolfram Language string, not this string object reference. The Wolfram Language also supports custom entity stores that allow the same computations as the built-in knowledgebase, and can be associated with external relational databases. To switch back to displaying graphics, call mathCanvas@setImageType[MathCanvas`GRAPHICS].
Only advanced programmers will need to use this. Each link is the kernel's $ParentLink during the time that the kernel is computing input that arrived from that link. To solve this problem, ShareKernel returns a token (it is just an integer, but you should not be concerned with its representation) that reflects a request for sharing functionality. Many Java field names have underscores in them, for example java.awt.Frame.TOP_ALIGNMENT. Note that it would be quite possible to add Wolfram Language functions to J/Link that would provide explicit support for Bean properties.
Modal programs like this are best developed using ShareFrontEnd, then made modal only when they are complete.
At this point, you may be wondering about things like reference counts and how objects returned to the Wolfram Language get cleaned up. The fix is to force J/Link's class loader to be used. You can also use a MathCanvas or MathGraphicsJPanel to display a Java Image by using the setImage() method instead of setMathCommand().
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