The Class: Think of the class as a template for a container of information (code and data), much like a module.Understanding Classes, Instances and Referencesīefore you can use a class in your project, it is important to understand the distinction between these three concepts: the class itself, the instance of the class and the reference to the class.
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And with classes, you have the option to create versions that don’t allow access to the source code of the class, allowing you to create classes you can share or sell to others. You can use classes to create custom controls. More Control: Classes give you more control than you can get by simply adding code to the event handlers of a control in a window.The less code you have, the less code there is to debug. Changes to the code in a class are automatically used anywhere where the class is used. By storing one copy of the code, when you need to make changes, you'll spend less time tracking down all those places in your project where you are using the same code. If you have basically the same code copied in several places of your application, you have to keep that in mind when you make changes or fix bugs. Easier Code Maintenance: Less code means less maintenance.Smaller Projects and Applications: Because classes allow you to store code once and use it over and over in a project, your project and the resulting application is smaller in size and may require less memory.If you create a class based on the PushButton control and then add your code to that class, any usage (instances) of that custom class will have that code. If you want to use the same code with another PushButton, you need to copy the code and then make changes to the code in case it refers to the original PushButton (since the new PushButton will have a different name than the original).Ĭlasses store the code once and refer to the object (like the PushButton) generically so that the same code can be reused any number of times without modification.
But unlike a module, a class provides better code reuse. In its simplest form, a class is a container of code and data much like a module.
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