Javascript [Electronic resources] : The Definitive Guide (4th Edition) نسخه متنی

Availability

Netscape 3 LiveConnect

Synopsis

package.package_name // Refers to another JavaPackage
package.class_name // Refers to a JavaClass object

Properties

The properties of a JavaPackage object are the names of the
JavaPackage objects and JavaClass objects that it contains. These
properties are different for each individual JavaPackage. Note that
it is not possible to use the JavaScript for/in
loop to iterate over the list of property names of a Package object.
Consult a Java reference manual to determine the packages and classes
contained within any given package.

Description

The JavaPackage object is a JavaScript representation of a Java
package. A package in Java is a collection of related classes. In
JavaScript, a JavaPackage can contain classes (represented by the
JavaClass object) and other JavaPackage objects.

The Window object has properties java,
netscape, and sun that
represent the

java.* ,

netscape.* , and

sun.*
package hierarchies. These JavaPackage objects define properties that
refer to other JavaPackage objects. For example,
java.lang and java.net refer to
the

java.lang and

java.net
packages. The java.awt JavaPackage contains
properties named Frame and
Button, which are both references to JavaClass
objects and represent the classes

java.awt.Frame
and

java.awt.Button .

The Window object also defines a property named
Packages, which is the root JavaPackage whose
properties refer to the roots of all known package hierarchies. For
example, the expression Packages.java.awt is the
same as java.awt.

It is not possible to use the for/in loop to
determine the names of the packages and classes contained within a
JavaPackage. You must have this information in advance. You can find
it in any Java reference manual or by examining the Java class
hierarchy.

See Chapter 22 for further details on working with
Java packages, classes, and objects.

See Also

JavaArray, JavaClass, JavaObject; the java,
netscape, sun, and
Packages properties of the Window object; Chapter 22