[Chapter 14] 14.4 AppletStub Interface
Author: John Zukowski
Date: Thu Jul 31 14:54:05 1997

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| Chapter 14 And Then There Were Applets |

## 14.4 AppletStub Interface

The `AppletStub` interface provides a way to get information from the run-time browser environment. The `Applet` class provides methods with similar names that call these methods. Methods

public abstract boolean isActive ()

  The `isActive()` method returns the current state of the applet. While an applet is initializing, it is not active, and calls to `isActive()` return `false`. The system marks the applet active just prior to calling `start()`; after this point, calls to `isActive()` return `true`.

public abstract URL getDocumentBase ()

  The `getDocumentBase()` method returns the complete URL of the HTML file that loaded the applet. This method can be used with the `getImage()` or `getAudioClip()` methods to load an image or audio file relative to the HTML file.

public abstract URL getCodeBase ()

  The `getCodeBase()` method returns the complete URL of the .class file that contains the applet. This method can be used with the `getImage()` method or the `getAudioClip()` method to load an image or audio file relative to the .class file.

public abstract String getParameter (String name)

  The `getParameter()` method allows you to get parameters from `<PARAM>` tags within the `<APPLET>` tag of the HTML file that loaded the applet. The `name` parameter of `getParameter()` must match the name string of the `<PARAM>` tag; `name` is case insensitive. The return value of `getParameter()` is the value associated with `name`; it is always a `String` regardless of the type of data in the tag. If `name` is not found within the `<PARAM>` tags of the `<APPLET>`, `getParameter()` returns `null`.

public abstract AppletContext getAppletContext ()

  The `getAppletContext()` method returns the current `AppletContext` of the applet. This is part of the stub that is set by the system when `setStub()` is called.

public abstract void appletResize (int width, int height)

  The `appletResize()` method is called by the resize method of the `Applet` class. The method changes the size of the applet space to `width` x `height`. The browser must support changing the applet space; if it doesn't, the size remains unchanged.

AppletContext Interface |  | Audio in Applications