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<Scripting: Javascript to Java Integration (Part 2) ⁄ >




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Last time I discussed some of the main features of Javascript to Java integration in the Java 6 scripting engine. As you get into more advanced interaction with Java, however, there are some things you have to know to 'cross over'.

Implementing Interfaces

An important component of interacting with Java is the ability to implement Java interfaces. You can pass Javascript objects masquerading as Java objects into Java code, or even return the interface as a completed variable from the script.

There are multiple ways to implement an interface, and following the nature of Javascript, everything is very fluid and casual. The most implicit way to implement an interface is to create a new function (a javascript code block), and pass it in:

importPackage(java.lang);

t = new Thread(function() { println('hello') });
t.start();

The 'function' passed in is translated into a java.lang.Runnable by Rhino; this thread will be started and will execute hello. Yes, that means multi-threaded Javascript is possible.

You can also explicitly create a JS object, and associate nested functions with the appropriate methods of the interface. The Javascript implementation is closely related (syntactically) to a Java anonymous class. Here is how we create a Runnable object and implement the run method:



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