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VB.NET OOP Part 2 - Understanding Constructors

by Budi Kurniawan co-author of VB.NET Core Classes in a Nutshell
11/04/2002
Beginners of OOP with VB.NET often don't pay enough attention to constructors. The reason for this is their classes are usable even without a constructor. What's worse is that many think constructors are just another type of method, which is simply not true. This article focuses on constructors, what they are used for, and some examples on using them. Understanding constructors well helps you write better classes.
For an object to be created from a class, the class needs a constructor. At a glance, a constructor looks just like a method. However, constructors are used for the sole purpose of creating an instance of a class. Here are the characteristics of a constructor:
• Always defined as a Sub. It therefore does not have a return value.
• Regardless the name of the class, the constructor in VB.NET is called New.
• Can have any access modifier (Public, Protected, Friend, Private, or default).
• In most cases, a constructor has a Public access modifier.
• A class can have multiple constructors.
Say you write a class called Employee, as given below: ...