为什么要将变量声明为以类命名的类型

Question

Using C# as an example. Say there is a class named ExampleClass and the variable is just value. Why would one declare a variable like this

private ExampleClass value;

Answer 1

You wouldn't declare a variable named value unless there was some unavoidable requirement to do so.

The reason why is because it is not meaningfully named .

When we name variables meaningfully, our code becomes self-documenting . Well documented code is always worthy goal.

Answer 2

This is a field and can be declared inside a class. Example:

private class Test
{
    private int _customField;
}

_customField is my field with type int (instead of ExampleClass ). People use it to make something more accessible since C# isn't just functions, it's OOP.

Answer 3

There is a thing called Primitive Obsession . Using a class/specific type here is the solution to it.

If you use a class, you got all the Compiler Type checking to help you avoid invalid values.

Take this Enum vs Integer question for examples.