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When is it feasible to nest classes? The most common advantage of it that I see is "shared scope" (use of variables across classes).
Is this less attractive/less a best practice than just putting the nested class in it's own file, and passing the arguments through the Constructor?
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Nested class: Use it if your requirements are similar to those of a local class, you want to make the type more widely available, and you don't require access to local variables or method parameters.
In Java, it is also possible to nest classes (a class within a class). The purpose of nested classes is to group classes that belong together, which makes your code more readable and maintainable.
In C#, a user is allowed to define a class within another class. Such types of classes are known as nested class. This feature enables the user to logically group classes that are only used in one place, thus this increases the use of encapsulation, and create more readable and maintainable code.
Inner classes are a security mechanism in Java. We know a class cannot be associated with the access modifier private, but if we have the class as a member of other class, then the inner class can be made private. And this is also used to access the private members of a class.
There are several reasons for using nested classes, among them:
It is a way of logically grouping classes that are only used in one place.
It increases encapsulation.
Nested classes can lead to more readable and maintainable code.
Child to parent class connection is simpler as it visually illustrates the variables and methods of each class.
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In addition to those mentioned already, one other benefit is:
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