Title Banner

Previous Book Contents Book Index Next

Inside Macintosh: JManager Reference /


Glossary

Abstract Window Toolkit (AWT) In the Java runtime, a collection of functions that allows Java programs to manipulate virtual graphics (windows, images, buttons, and so on). These abstract graphics can be translated into user-visible windows and controls on the client platform.

applet In the Java runtime, an executable program that must run within a larger host application. In JManager an instantiated applet is called a JMAppletViewerRef object.

applet tag Text in an HTML document that describes an embedded applet. This text is bounded by the <APPLET> and
</APPLET> delimiters.

AWT context An instantiation of an execution environment in the Java runtime. An AWT context is a separate thread and may represent a thread group. An AWT context typically contains an applet and one or more frames. In JManager, an AWT context is called a JMAWTContextRef object. See also Abstract Window Toolkit (AWT).

file system specification record On Mac OS-based platforms, a method of describing the name and location of a file or directory. File system specification records are defined by the FSSpec data type.

frame A user interface window in the Java virtual machine. Frames typically contain a title bar and can be moved by the user. Frames are analogous to a window record on the Mac OS. See also parent frame.

Hypertext Markup Language (HTML) A standard for describing the layout and contents of a hypertext document. An HTML document can contain an applet tag that specifies the name and location of an applet. See also applet tag.

HTML See Hypertext Markup Language.

Java runtime environment The Java virtual machine and the associated software required to load and execute Java code. See also virtual machine.

Java runtime session An instantiation of the Java runtime environment (that is, an instantiatiation of the Java virtual machine and associated software). In JManager a Java runtime session is called a JMSessionRef object. See also virtual machine.

parent frame The main user interface window associated with an applet. The parent frame is created when the applet is instantiated. In an AWT context, the parent frame has the index value 0. See also frame.

session See Java runtime session.

thread An independent event loop in the Java virtual machine. Multiple threads can run concurrently in a Java virtual machine. A thread is also called a lightweight process.

Uniform Resource Locator (URL) A text string that describes the location of an HTML document. A URL may point to a file or to a server that contains the file.

URL See Uniform Resource Locator.

virtual machine (VM) A software package that simulates the actions of a microprocessor. A virtual machine can mimic an existing processor (such as the 68K emulator on PowerPC-based Mac OS computers) or parse special VM-specific code. Java code requires a virtual machine environment to execute. See also Java runtime environment, Java runtime session.


Previous Book Contents Book Index Next

© Apple Computer, Inc.
13 DEC 1996




Navigation graphic, see text links

Main | Top of Section | What's New | Apple Computer, Inc. | Find It | Feedback | Help