JavaFX Primer - JavaFX: Developing Rich Internet Applications - page 37

public class Porsche911 extends Porsche {
}
JavaFX may extend multiple JavaFX mixin classes or Java interfaces. Mixin
classes are discussed in the next section.
An application may contain many classes, so it is helpful to organize them in a
coherent way called packages . To declare that your class or script should belong
to a package, include a package declaration at the beginning of the script file.
The following example means that the Title class belongs to the
com.mycompany.components package. The full name of the Title class is now
com.mycompany.components.Title . Whenever the Title class is referenced, it
must be resolved to this full name.
package com.mycompany.components;
public class Title {
}
To make this resolution easier, you can include an import statement at the top of
your source file. For example:
import com.mycompany.components.Title;
var productTitle = Title{};
Now, wherever Title is referenced within that script file, it will resolve to
com.mycompany.components.Title . You can also use a wildcard import declaration:
import com.mycompany.components.*;
With the wildcard form of import, whenever you refer to any class in the
com.mycompany.components package, it will resolve to its full name. The fol-
lowing code example shows how the class names are resolved, showing the fully
qualified class name in comments.
package com.mycompany.myapplication;
import com.mycompany.components.Title;
// com.mycompany.myapplication.MyClass
public class MyClass {
// com.mycompany.components.Title
public var title: Title;
}
A class can have package visibility by using the package keyword instead of public .
This means the class can only be accessed from classes within the same package.