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APPENDIX A
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Getting started
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http://blogs.sun.com/chrisoliver/ Blog: Joshua Marinacci s Blog http://weblogs.java.net/blog/joshy/ Blog: Ramblings on life, the Universe, and Java(FX) http://weblogs.java.net/blog/javakiddy/ Extra examples, coded during the writing of this book http://www.jfxia.com/
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appendix B: JavaFX Script: a quick reference
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This appendix is an ultraterse guide to JavaFX Script, almost like flash cards for each of the topics covered in the main language tutorial chapters earlier in this book. As well as acting as a quick reference to the language syntax, it could also be used by highly confident developers (impatient to get on to the projects) as a fast track to learning the basics of the JavaFX Script language.
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Comments
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JavaFX Script supports comments in the same way as Java:
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// A single line comment. /* A multi line comment. */
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Variables and data types the basics
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JavaFX Script variables are statically, not dynamically, typed. The language has no concept of primitives in the way Java does; everything is an object. Some types may be declared using a literal syntax. We call these the value types, and they are Boolean, Byte, Character, Double, Duration, Float, Integer, Long, Number, Short, and String. KeyFrame, an animation class, also has its own specific literal syntax (dealt with in the chapters dealing with animation timelines). Aside from having their own literal syntax, value types can never be null, meaning unassigned value types have default values. Value types are also immutable.
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Variable declaration (def, var, Boolean, Integer, Number, String) Value types are created using the var or the def keyword, followed by the variable s name and optionally a colon and a type.
var var var var var var var var var var
APPENDIX B
JavaFX Script: a quick reference
valBool:Boolean = true; valByte:Byte = -123; valChar:Character = 65; valDouble:Double = 1.23456789; valFloat:Float = 1.23456789; valInt:Integer = 8; valLong:Long = 123456789; valNum:Number = 1.245; valShort:Short = 1234; valStr:String = "Example text";
If initial values are not provided, sensible defaults are used. JavaFX Script also supports type inference.
var var var var assBool = true; assInt = 1; assNum = 1.1; assStr = "Some text";
The def keyword prevents a variable from being reassigned once its initial value is set. This aids readability, bug detection, and performance. Note: although the variable cannot be reassigned, if its body uses a one-way bind, its value can still change.
var canAssign:Integer = 5; def cannotAssign:Integer = 5; canAssign = 55; cannotAssign = 55;// Compiler error
Arithmetic (+, -, etc.) Numbers may be manipulated in mostly the same ways as Java when it comes to arithmetic. Remember, though, all variables are objects, and so are literals in the source code.
def def var var var var var n1:Number = 1.5; n2:Number = 2.0; nAdd = n1 + n2; nSub = n1 - n2; nMul = n1 * n2; nDiv = n1 / n2; iNum = n1.intValue();
var int1 = 10; var int2 = 10; int1 *= 2; int2 *= 5; var int3 = 9 mod (4+2*2); var num:Number = 1.0/(2.5).intValue(); def dec = 16; def hex = 0x10; def oct = 020; // 16 in decimal // 16 in hexadecimal // 16 in octal
Logic operators (and, or, not, <, >, =, >=, <=, !=) Comparisons between variables are done pretty much the same way as in Java, except the && and || symbols are replaced by the keywords and and or.
Strings
def var var var var var var var var testVal = 99; flag1 = (testVal == 99); flag2 = (testVal != 99); flag3 = (testVal <= 100); flag4 = (flag1 or flag2); flag5 = (flag1 and flag2); today:java.util.Date = new java.util.Date(); flag6 = (today instanceof java.util.Date); flag7 = not flag6;
Casting (as, instanceof) Casting is done using the as keyword, following the variable to be cast. Types can be tested using the instanceof operator.
var pseudoRnd:Integer = (java.langSystem.currentTimeMillis() as Integer) mod 1000; var str:java.lang.Object = "A string"; var inst1 = (str instanceof String);
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