By Dan Shafer

Object-Oriented Programming (OOP) is well-known as the most strong programming suggestions to return alongside in lots of years. Its strength lies within the skill it supplies the fashion designer to regulate the advanced, quickly altering functions that experience develop into the watchword of recent software program. Smalltalk is the main commonly used OOP atmosphere. Now Practical Smalltalk enables you to specialise in these facets of the language that you have to be aware of to be a profitable programmer. you are going to examine all concerning the vital sessions to grasp, the basic theories to understand, after which placed those rules to paintings in developing every thing from an easy counter item throughout an information graphing software and the center of a practical outliner. The ebook culmi- nates with the production of a manufacturing facility technique simulation that takes good thing about Smalltalk's skill to create multi-window, multiprocessing functions. Designed for programmers and executives who needs to comprehend the operation and makes use of of the Smalltalk setting, this publication assumes simply an hassle-free operating wisdom of OOP and the language. The ebook makes use of Smalltalk/V 286, Digitalk's established implementation of Smalltalk, yet lots of the suggestions and strategies it teaches should be transferred simply to different types of the language.

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Open the CHB on this class and browse through the instance methods. You won't find anything that sounds particularly useful. Click on the "class" button beneath the pane containing the list of methods and take a look at the class methods. There are two. The first one that sounds promising is systemMenu. Select this method and you can see that it's not very helpful. It only has one line and that line refers to something called a ScreenMenu. So let's look atthe other class method, initialize . ) Sure enough, there's some code that looks like it might be helpful.

You can use the Disk Browser, discussed below, to create a text file that contains these pieces of information. These files are normal DOS files and can be saved, renamed, deleted, etc. ) ~ Using the Debugger The Debugger is one of the richest tools available to you as a SmalltalkIV programmer. It combines the functions of a debugger, browser, and inspector into one immensely useful tool. You will undoubtedly get to know this set of windows much more intimately than you had hoped before you have finished building your first complex application.

You will undoubtedly get to know this set of windows much more intimately than you had hoped before you have finished building your first complex application. We'll find frequent uses for the Debugger walkback and main window throughout the book. In this section, we'll take a look at its general use and contents. Then in Chapter 3 we'll take a look at some of its limitations as we see it in use in debugging our first SmalltalkIV project. Chapter 1 The Environment 13 There are four ways for the SmalltalkN Debugger to be invoked: • by the system encountering an error condition • by the user pressing Control-Break • by sending the message halt to any object • by Smalltalk encountering a method for which the programmer has set a breakpoint We'll look in this chapter at the use of the Debugger in all but the last two situations.

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