A Simple Compiled JavaFX Script Example of Using Sequences

To continue preparing you for the upcoming compiled JavaFX Script Puzzler, please compile and run the example in this post.  For instructions on obtaining the JavaFX Script Compiler, see the Obtaining the OpenJFX Script Compiler Just Got Easier post in this weblog.  As a reminder, the Puzzler will be be posted at 18:00 GMT (1:00 pm EST) on Wednesday, November 28, 2007. 

Here is the code for today's example, followed by an explanation of some compiled JavaFX Script concepts:

/*
 *  CompiledSequenceExample.fx - A simple example in compiled JavaFX Script of 
 *  defining and iterating over a sequence.
 *
 *  Developed 2007 by James L. Weaver (jim.weaver at lat-inc.com)
 */
 
 import java.lang.System;
 
 class CompiledSequenceExample {
   attribute ordinals:String[] = ["zero", "one", "two", "three"];
   function printOrdinals():Void {
     System.out.println("Sequence elements:");
     foreach (element in ordinals) {
       System.out.println(element);
     }
   }
 }
 
var example =
  CompiledSequenceExample {
  };

example.printOrdinals();

Compiled JavaFX Script Concepts in this Example

This example demonstrates how to define a sequence in compiled JavaFX Script.  In this case, the sequence is declared in the ordinals attribute of the CompiledSequenceExample class.  To indicate that a variable refers to a sequence, square brackets ([]) are used in compiled JavaFX instead of the asterisk (*) used in interpreted JavaFX.

As with the CompiledHelloJavaFX example in a previous post, this example initializes an attribute in the same statement in which is it is declared, in this case with a few names of ordinal numbers.

In interpreted JavaFX, there are two ways of defining a method: a function and an operation.  Compiled JavaFX simplifies this by combining both into a function.  If a function doesn't return a value, then it must be defined as returning Void in the manner shown in the example.

Speaking of simplification, as I mentioned in the Express Yourself post, the for and foreach functionality has been combined into foreach, which is used both in statements and expressions.  In today's example, foreach is being used as a statement to iterate and print the values of the sequence.

Enjoy!
Jim Weaver
JavaFX Script: Dynamic Java Scripting for Rich Internet/Client-side Applications
Immediate eBook (PDF) download available at the book's Apress site

Comments

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[Jim Weaver]

Craig,

It is my understanding that interpreted JavaFX Script will be replaced by compiled JavaFX Script, so when the compiler is mature, there won't be a need to support both. Thanks, Jim

[codecraig]

Are they planning on consolidating the methodology of defining a sequence to one method? Unless the compiler and interpreter can understand both methods, * or [] then it should be only done one way, either use a * or [].