Scripts and Compilation in Java

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Scripts and Compilation
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JavaFX Script is compiled to class files by the JavaFX compiler and is then executed on the Java Virtual Machine (JVM)After a script has been compiled, it is indistinguishable from a compiled Java source fileThe compiler is responsible for mapping each JavaFX Script source file to one or more class files Most of the time, you do not need to be concerned with how this is achieved, because the tools that are shipped with the JavaFX SDK hide the details, as discussed in 3, JavaFX Script Development, and 4, A Simple JavaFX Application One of the rare occasions on which you will see the mapping is when you need to analyze the stack trace of an uncaught exception
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Notice that we use the == operator to compare the value of the rawText variable to the empty string In Java, we have to use the equals() method to make this comparison, but JavaFX allows us to use == instead, because == is translated by the compiler to an invocation of equals(), as you ll see later in this book This is another of the many ways in which JavaFX is more programmer-friendly than Java
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The JavaFX Runtime
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Fortunately, it is usually easy to map from the stack frames in the stack trace to your original JavaFX code JavaFX Script can also be compiled and executed on-the-fly by using the Java Scripting API, which is built in to Java SE 6 (and also available as a separate download for Java 5)This can prove useful if you need to download a script from a remote server and execute it on the user s platformYou can only do this if you have both the JavaFX compiler and the classes for the Java Scripting API available to the Java VM that is executing your application, which means that it is not possible to do this on platforms that provide only the common profile
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The JavaFX Runtime
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The JavaFX runtime can be divided into two parts the part of the runtime that is profile-independent and is used by both applications and the JavaFX compiler itself, and the part that is profile-dependent and on which the compiler has no dependencies Some of the profile-independent runtime is directly used only by the compiler and the runtime libraries, but there are many public APIs that your JavaFX application can use, including the println() function that writes to the standard output stream, functions that let you read command-line arguments, applet parameters and system properties, and an API that lets you store information in a device-independent way Many of these useful functions are covered in 12, Platform APIs The APIs that are part of the common profile appear in all implementations of the runtime librariesThe code that implements these APIs in the three existing runtimes may not be the same, but the API itself is, and they are functionally equivalentThe runtime for JavaFX Desktop also contains implementations of the APIs that are unique to the desktop profile The runtime libraries are the subject of Parts III and IV of this book Here, we briefly look at some of the most important features that they provide
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User Interface Classes
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The majority of the runtime library consists of classes that are concerned with creating user interfaces In JavaFX, a user interface is a collection of nodesA node may represent a shape of some kind, such as a circle or a rectangle, some text, or something more complex such as a player for video or audio content Nodes can be placed within a scene, which represents a complete user interface, or in a group, which is then placed in a scene or in another group Operations are provided that enable you to move, rotate, scale, or shear individual nodes Nodes in a group can be treated as a separate unit to which any of these operations can be appliedApplying a rotation to a group, for example, causes the whole group to be rotated Figure 1-2 shows a simple JavaFX application that consists of a number of nodes, running on a Windows PCThe background image is a node, as are each of the white circles that represent snowflakesThe text at the bottom of the application that counts the number of visible snowflakes is also a node
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