JavaFX Script Basics in Java

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2 JavaFX Script Basics
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interpolating between two values during an animation3 One way to refer to these constants is to import the Interpolator class and then use the class and constant names together:
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import javafxanimationInterpolator; // Print the value of the constant DISCRETE println(InterpolatorDISCRETE); // Print the value of the constant EASEIN println(InterpolatorEASEIN);
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If you prefer (and again this is a matter of style), you can use a static import and omit the class name when referring to the constants:
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// Equivalent to a Java static import: import javafxanimationInterpolator*; // Note the "*" // Print the value of the constant DISCRETE println(DISCRETE); // Print the value of the constant EASEIN println(EASEIN);
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If you only need to refer to one constant, you can explicitly import just that constant, like this:
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import javafxanimationInterpolatorEASEIN; println(EASEIN);
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Automatic Imports
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A small number of classes and functions are automatically imported into every JavaFX source fileYou do not need to add import statements to use any of the following:
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The class javalangObject Note, however, that no other classes in the javalang package are automatically imported The basic type javafxlangDuration, which is used in conjunction with the animation features, described in 18, Animation The class javafxlangFX All the public functions in the class javafxlangBuiltins
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println(), which
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Among the public functions imported from javafxlangBuiltins are print() and are similar to the methods of the same name in the Java class
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Animation is discussed in 18
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Other JavaFX Statements
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javalangSystemThe
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automatic import of these functions allows you to write information to the standard output stream more easily than you can in Java:
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print("Hello, World"); println("Hello, World"); // No trailing newline // Trailing newline added
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Functions with the same names can also be found in the javafxlangFX class, but they are simply delegates for the actual implementations in javafxlangBuiltinsThe API provided by these two classes is discussed in 12, Platform APIs
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Direct Class References
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You are not obliged to import every Java or JavaFX class that your code uses instead, you can refer to any class by using its fully qualified name, which must include the package designatorThis can be convenient if you want to quickly add a few lines into a file for testing or prototyping purposesThe following example shows another way to print the current date and time, without requiring an import of the javautilDate class:
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println(new javautilDate());
Other JavaFX Statements
Following the package and import lines is the body of the script, written using JavaFX statementsThe following paragraphs give an overview of the statement types that JavaFX provides Further details can be found in Part II of this book
Variable Declarations
Like Java, JavaFX requires you to declare any variables that you intend to useA variable is declared and given a name using either the var or def keywords, which are discussed in detail, along with the JavaFX type system, in 5, Variables and Data Types Variables can be declared in the body of the script or within a class definitionThe former are referred to as script variables, the latter as instance variables
Value Assignment and Data Manipulation
Value assignment in JavaFX uses the same syntax as in Java and many other programming languages For example, the following assigns the value 3 to a variable called value that has already been defined and is of the appropriate type:
value = 3;
The right side of this statement can be an expression of arbitrary complexity JavaFX also supports a variable type called a sequence that is, in many ways, like a Java array4 There
Java arrays are also supported to allow JavaFX to invoke Java methods that have array-valued arguments or return an array
2 JavaFX Script Basics
are data-manipulation statements that allow you to add and remove elements from a sequence and to change the value of an existing element For example, the following statement inserts a new value into a sequence variable called names:
insert "John" into names;