JavaFX Keywords and Reserved Words in Java

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JavaFX Keywords and Reserved Words
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Keywords in JavaFX are of two types: those that are reserved, and those that are not reservedTable 2-1 lists the keywords that are reserved in JavaFX 13 Reserved words may be used only where the grammar allows you cannot use them for the names of classes, functions, or variables5 The remaining keywords, listed in Table 2-2 are not reserved, but have special meaning in specific contexts Outside of these contexts, they can be used as variable, function, or class names
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Table 2-1
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abstract attribute class extends If mixin or public-init super typeof
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JavaFX Reserved Words
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after before continue false import mod override public-read then var and bind def finally indexof nativearray package return this while as bound delete for insert new private reverse throw assert break else from instanceof not protected sizeof true at catch exclusive function lazy null public static try
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It is possible to use a reserved word as a class, variable, or function name if you surround it with French quotes for example, <<insert>> but this is not recommended
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2 JavaFX Script Basics
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Table 2-2
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first last tween
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JavaFX Keywords That Are Not Reserved Words
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in on where init postinit with into replace invalidate step inverse trigger
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Not all the keywords in Table 2-1 and Table 2-2 are actually used at the time of this writingThose that are not currently in use are shown in italic fontThese words are either holdovers from earlier versions of the language or are reserved for possible future use
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Script Execution and Arguments
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The entry point for a Java application is a class with main() methodThe JavaFX equivalent of the main() method is the run() function, which has the following signature:
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public function run(args:String[]):Object
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This syntax, which is explained more fully in 6, declares a function with a single argument called args, which is a sequence of strings6 and which returns a result of type ObjectThe args argument is initialized by the JavaFX runtime with the values of any command-line arguments, so the declaration of run() is very much like that of the Java main() method:
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public static void main(String[] args)
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The overwhelming majority of the scripts that you ll see in this book (and, probably, almost all the scripts that you will write) do not contain a run() function, because in most cases there is no need to supply one If your script does not explicitly declare a run() function, the compiler generates one that contains all the executable code in the script In some cases, however, you are required to supply this function Here are the rules:
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If your script does not contain any function, variable, or class declarations that are visible outside the script, a run() function is not requiredThis covers the vast majority of JavaFX scripts that implement application code, as opposed to code intended for reuse, such as custom graphical user interface (GUI) components and library functions, where most of the script s content will be public If your script contains any function, variable, or class declarations that are visible outside the script and it has executable code, the executable code must be placed in the run() function If your script contains a run() function, no executable code may appear outside of it
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You are not obliged to use any particular name for the argument of the run() function The use of the name args, as shown here, is just a convention
Script Execution and Arguments
We ll examine these rules in the context of an example that you saw earlier, which we repeat here for ease of reference:
1 2 3 4 5 6 7 8 9 10 11 function average(a, b) { return (a + b) / 2; } // Definition of a function
var x = 2; var y = 4; var avg = bind average(x, y); // Binds "avg" to the return value println("Average is {avg}"); y = 8; // Causes the value of "avg" to be changed println("Average is {avg}");7
The code on lines 1 to 3 is a function declaration, lines 5 to 7 are variable declarations, and the rest is executable code Because none of the declarations has an access modifier that makes the corresponding function or variable visible outside the script (such as public; see 5, Variables and Data Types ), there is no need to wrap any of this in a run() function, so the preceding code is legal If we were to make the function public, the compiler would not allow the code on lines 8 to 11 to appear in the body of the script Instead, it would need to be moved into the run() function, like this:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 public function average(a, b) { return (a + b) / 2; } // Visible outside the script
var x = 2; var y = 4; var avg = bind average(x, y); // Binds "avg" to the return value public function run(args:String[]) { println("Average is {avg}"); y = 8; // Causes the value of "avg" to be changed println("Average is {avg}"); }
run()
Notice that the variable declarations on lines 5 to 7 do not have to be moved into the function, although it would make perfect sense to do soThese declarations are valid because they are not considered to be executable code, even though they have initializers that will cause code to be executed In reality, no real difference exists between this code and the version that follows, which is more readily understandable:
The syntax "string {value}" represents a string with an embedded expression that is evaluated at runtime For more details, see 4, A Simple JavaFX Application