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# Packages

A top-level object used to access Java classes from within JavaScript code.

Core object |
Implemented in | JavaScript 1.1, NES 2.0

#### Created by

The `Packages` object is a top-level, predefined JavaScript object. You can automatically access it without using a constructor or calling a method.

#### Description

The `Packages` object lets you access the public methods and fields of an arbitrary Java class from within JavaScript. The `java`, `netscape`, and `sun` properties represent the packages java.*, netscape.*, and sun.* respectively. Use standard Java dot notation to access the classes, methods, and fields in these packages. For example, you can access a constructor of the `Frame` class as follows:

    var theFrame = new Packages.java.awt.Frame();

For convenience, JavaScript provides the top-level `netscape`, `sun`, and `java` objects that are synonyms for the `Packages` properties with the same names. Consequently, you can access Java classes in these packages without the Packages keyword, as follows:

    var theFrame = new java.awt.Frame();

The `className` property represents the fully qualified path name of any other Java class that is available to JavaScript. You must use the `Packages` object to access classes outside the `netscape`, `sun`, and `java` packages.

#### Property Summary

Property | Description
--- | ---

    className

The fully qualified name of a Java class in a package other than netscape, java, or sun that is available to JavaScript.

    java

Any class in the Java package java.*.

    netscape

Any class in the Java package netscape.*.

    sun

Any class in the Java package sun.*.

#### Examples

    The following JavaScript function creates a Java dialog box:

    function createWindow() {
       var theOwner = new Packages.java.awt.Frame();
       var theWindow = new Packages.java.awt.Dialog(theOwner);
       theWindow.setSize(350,200);
       theWindow.setTitle("Hello, World");
       theWindow.setVisible(true);
    }

In the previous example, the function instantiates `theWindow` as a new `Packages` object. The `setSize`, `setTitle`, and `setVisible` methods are all available to JavaScript as public methods of `java.awt.Dialog`.

## className

The fully qualified name of a Java class in a package other than `netscape`, `java`, or `sun` that is available to JavaScript.

Property of | `Packages`
Implemented in | JavaScript 1.1, NES 2.0

#### Syntax

    Packages.className

where `classname` is the fully qualified name of a Java class.

#### Description

You must use the `className` property of the `Packages` object to access classes outside the `netscape`, `sun`, and `java` packages.

#### Examples

The following code accesses the constructor of the `CorbaObject` class in the `myCompany` package from JavaScript:

    var theObject = new Packages.myCompany.CorbaObject()

In the previous example, the value of the `className` property is `myCompany.CorbaObject,` the fully qualified path name of the `CorbaObject` class.

## java

Any class in the Java package `java.*`.

Property of | `Packages`
Implemented in | JavaScript 1.1, NES 2.0

#### Syntax

    Packages.java

#### Description

Use the `java` property to access any class in the `java` package from within JavaScript. Note that the top-level object `java` is a synonym for `Packages.java`.

#### Examples

    The following code accesses the constructor of the java.awt.Frame class:

    var theOwner = new Packages.java.awt.Frame();

You can simplify this code by using the top-level java object to access the constructor as follows:

    var theOwner = new java.awt.Frame();

## netscape

Any class in the Java package `netscape.*`.

Property of | `Packages`
Implemented in | JavaScript 1.1, NES 2.0

#### Syntax

    Packages.netscape

#### Description

Use the `netscape` property to access any class in the `netscape` package from within JavaScript. Note that the top-level object `netscape` is a synonym for `Packages.netscape`.

#### Examples

    See the example for .Packages.java

## sun

Any class in the Java package `sun.*`.

Property of | `Packages`
Implemented in | JavaScript 1.1, NES 2.0

#### Syntax

    Packages.sun

#### Description

Use the `sun` property to access any class in the `sun` package from within JavaScript. Note that the top-level object `sun` is a synonym for `Packages.sun`.

#### Examples

    See the example for .Packages.java

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Last Updated: 05/28/99 12:00:08

Copyright (c) 1999 Netscape Communications Corporation