TweetFollow Us on Twitter

Sep 96 Dialog Box
Volume Number:12
Issue Number:9
Column Tag:Dialogue Box

Dialog Box

By Matt Neuburg, letters@mactech.com

Hello Java, Good-bye OLE and OpenDoc

Sometimes, when we are lucky, reality sneaks up and screams “Hello!” when we most need it.

Thinking about how to write extensible applications in Java, I was listing requirements, procedures, and issues for communication and control between the main application and the extensions. What is the minimum core of OLE and OpenDoc? Does it really have to be as complicated as OpenDoc?

Then reality suddenly screamed, “Hello! Isn’t a Java-enabled browser one of the most extensible applications we have ever seen? How is that done?”

A browser can load and run essentially “anonymous” applets, of any complexity, that can do just about anything - even bring up windows and work with files (when permitted). What more could we want?

Well, for extensible applications in general, we could want custom menus, closer integration into the application, and more access to the application’s data. As it happens, all this is possible - right now - with Java; the implementation of a browser shows us how.

We extend the Applet class to make our own applets. The Applet class establishes a few “entry points” (methods) through which a browser can tell the applet to initialize itself, run, update, and so on. The applet can do whatever else you want in addition to these few responsibilities.

For its part, the browser must implement the AppletContext interface, which dictates the services the browser must provide to any applet. If both sides fulfill these contracts, the browser can use Java’s ClassLoader to load an applet from a local or remote file, place it into the browser’s own window, and run it.

To implement our own extensible applications, we don’t have to use applets (although we certainly can); we just need to set up the kind of contracts established by the Applet class and the AppletContext interface. Perhaps we will include ways to share menus and application data; the particular methods are our call (so to speak).

Now think of the silliness of first implementing a Java-enabled OpenDoc part, then rewriting applications to accept OpenDoc parts! Or just rewriting for OpenDoc in general. Why not rewrite the applications in Java, and get straight to the point?

“Hello!” Which is the actually existing revolution - Java, or OLE/OpenDoc?

It’s time to tell OLE and OpenDoc (and VBXs, OCXs, XFCNs, MOBJs, XTNDs, and so on) “Good-bye!”

“Uncle Dave” Moffat

Mac Web Tools Redux

In the May 1996 Dialogue Box, Ziya Oz writes:

“At the last Macworld Expo in Boston, I asked myself: If Ceneca was not formed by ex-Taligent people, would they have developed Page/SiteMill for the Mac OS first? Would they even have developed for the Mac at all? My answers are: No and No again.”

His conclusions are erroneous. Ceneca initially planned to write PageMill for Windows. However, when they spoke to Web authors at several companies, they found out that Macintosh was the dominant platform for creating Web content. Ceneca therefore changed their strategy and developed a Mac version instead. (I learned this from Robert Seidl of Ceneca/Adobe at the WWDC.)

The majority of Web content is created on Macs. Macintosh is also the second most popular Web server, after UNIX. A developer writing content tools would be wise to publish a Mac version of his product.

Terry Morse

Language Wars Redux

Many Mac OS programmers still code in Pascal - and that’s OK. But they (and MacTech Magazine, too) should give another language a try. No, I’m not talking about C++ or Java; I’m talking about Oberon-2 (Pascal’s grandchild, so to speak). Interested? Then read on.

MacOberon, Oberon System 3, and Oberon/F generate 68K code. PowerOberon generates PowerPC code, but has no linker yet. Or you can use MPW. The URLs are:

ftp://ftp.inf.ethz.ch/pub/Oberon/

ftp://oberon.ssw.uni-linz.ac.at/pub/Oberon/PowerMac/

http://frodo.informatik.uni-ulm.de/projekte/MPWOberon/

As a CodeWarrior, I hope that Metrowerks will integrate this fantastic language into their IDE. But, till then, I’m perfectly happy with C++ and PowerPlant.

By the way, to “serious” Oberon users I recommend Programming in Oberon and Object-oriented Programming in Oberon-2 (both from Addison-Wesley).

Paul E. Sevinc

[Our paucity of articles written in Oberon is not due to any want of trying. In fact, we have a review of Oberon/F in the works; watch for it in a future issue. As always, the best way to ensure coverage of your favorite area of expertise is to participate by writing us an article yourself - man]

 

Community Search:
MacTech Search:

Software Updates via MacUpdate

Latest Forum Discussions

See All

How to evolve Eevee in Pokemon GO
By now, almost everyone should be hip to how to evolve Pokemon in Pokemon GO (and if not, there's a guide for that). Just gather enough candy of the appropriate type, feed them all to the Pokemon, and evolution happens. It's a miracle that would... | Read more »
CSR Racing 2: Guide to all game modes
It might not seem like there are all that many ways to go fast in a straight line, but CSR Racing 2 begs to differ. [Read more] | Read more »
Bulb Boy (Games)
Bulb Boy 1.0 Device: iOS Universal Category: Games Price: $2.99, Version: 1.0 (iTunes) Description: Multi-award winning 2D point & click horror adventure about a boy with a glowing head. | Read more »
5 top free emoji keyboard apps
If we're not at peak emoji yet as a society, it feels like we definitely should be. The emoji concept has gone far beyond what anyone in Japan could have envisioned when the people there unleashed it on an unsuspecting world, but the West has... | Read more »
How to unlock more characters in Disney...
One of the big charms of Disney Emoji Blitz is seeing a wide variety of beloved Disney and Pixar characters transformed into smiling emojis. Even someone like the sneaky Randall from Monsters Inc., who probably never cracked a smile on film, is... | Read more »
Cubway (Games)
Cubway 1.0 Device: iOS Universal Category: Games Price: $1.99, Version: 1.0 (iTunes) Description: Cubway is a journey with an abstract story of lifecycle of rebirth, called Samsara. Guide the cube through the long way full of dangers... | Read more »
Colorcube (Games)
Colorcube 1.0 Device: iOS Universal Category: Games Price: $1.99, Version: 1.0 (iTunes) Description: Turn pieces and blend colours in this minimal yet visually stunning puzzler.Over 200 handcrafted and challenging levels. Features... | Read more »
Doodle God Griddlers (Games)
Doodle God Griddlers 1.0 Device: iOS Universal Category: Games Price: $4.99, Version: 1.0 (iTunes) Description: | Read more »
Crusader Kings: Chronicles (Games)
Crusader Kings: Chronicles 1.0 Device: iOS Universal Category: Games Price: $4.99, Version: 1.0 (iTunes) Description: Crusader Kings: Chronicles is an interactive text based game that puts you in the shoes of Guy de Rose as you make... | Read more »
Roads of Rome: New Generation (Games)
Roads of Rome: New Generation 1.0 Device: iOS Universal Category: Games Price: $5.99, Version: 1.0 (iTunes) Description: | Read more »

Price Scanner via MacPrices.net

Apple price trackers, updated continuously
Scan our Apple Price Trackers for the latest information on sales, bundles, and availability on systems from Apple’s authorized internet/catalog resellers. We update the trackers continuously: - 15″... Read more
13-inch 2.5GHz MacBook Pro (Apple refurbished...
Apple has Certified Refurbished 13″ 2.5GHz MacBook Pros available for $829, or $270 off the cost of new models. Apple’s one-year warranty is standard, and shipping is free: - 13″ 2.5GHz MacBook Pros... Read more
21-inch iMacs on sale for up to $120 off MSRP
B&H Photo has 21″ iMacs on sale for up to $120 off MSRP including free shipping plus NY sales tax only: - 21″ 3.1GHz iMac 4K: $1379 $120 off MSRP - 21″ 2.8GHz iMac: $1199.99 $100 off MSRP - 21″ 1... Read more
Charitybuzz Set to Auction Unique Apple-1 Com...
Offering an opportunity to own the computer that sparked a revolution, on Monday, July 25, leading online charity auction platform Charitybuzz will auction what is claimed to be the world’s most... Read more
MacBook Airs on sale for up to $150 off MSRP
Amazon has 11″ and 13″ MacBook Airs on sale for up to $150 off MSRP for a limited time. Shipping is free: - 13″ 1.6GHz/128GB MacBook Air (sku MMGF2LL/A): $899.99 $100 off MSRP - 13″ 1.6GHz/256GB... Read more
Apple refurbished 13-inch Retina MacBook Pros...
Apple has Certified Refurbished 13″ Retina MacBook Pros available for up to $270 off the cost of new models. An Apple one-year warranty is included with each model, and shipping is free: - 13″ 2.7GHz... Read more
Apple refurbished 11-inch MacBook Airs availa...
Apple has Certified Refurbished 11″ MacBook Airs (the latest models), available for up to $170 off the cost of new models. An Apple one-year warranty is included with each MacBook, and shipping is... Read more
Apple iPad Pro Sales Far Outpacing Microsoft...
A report on Appleinsider notes that despite Microsoft Surface tablet PC sales growing by 9 percent year over year, revenues remained below $1 billion, and are down sequentially from the $1.1 billion... Read more
DEVONthink 2.9 Features Ultra-fast, Robust, A...
DEVONthink 2.9 allows users to keep databases synchronized using many means of transport. It transmits them between Macs on the local network or stores them in a syncable form on removable hard... Read more
12-inch WiFi Apple iPad Pros on sale for up t...
B&H Photo has 12″ WiFi iPad Pros on sale for up to $100 off MSRP, each including free shipping. B&H charges sales tax in NY only: - 12″ Space Gray 32GB WiFi iPad Pro: $749 $50 off MSRP - 12″... Read more

Jobs Board

*Apple* Solutions Consultant - APPLE (United...
Job Summary As an Apple Solutions Consultant, you'll be the link between our future customers and our products. You'll showcase your entrepreneurial spirit as you Read more
*Apple* Professional Learning Specialist - A...
Job Summary The Apple Professional Learning Specialist is a full-time position for one year with Apple in the Phoenix, AZ area. This position requires a high Read more
*Apple* Picker - Apple Hill Orchard (United...
Apple Hill Orchard, Co. Rte. 21,Whitehall, NY 9/7/16-10/228/16. Pick fresh market or processing apples Productivity of 60 boxes and 80 boxes processing fruit per Read more
*Apple* Solutions Consultant - APPLE (United...
Job Summary As an Apple Solutions Consultant, you'll be the link between our future customers and our products. You'll showcase your entrepreneurial spirit as you Read more
*Apple* Retail - Multiple Positions - Apple,...
Job Description:SalesSpecialist - Retail Customer Service and SalesTransform Apple Store visitors into loyal Apple customers. When customers enter the store, Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.