Why do you define a constructor with parameters and the default constructor without parameters disappears?

There is no technical reason why the compiler cannot add a constructor just because the user defines it. However, if you want to instantiate a class in a non-static class that does not define a constructor, the compiler does nothing, but you must add a default constructor that can be instantiated. So it doesn't have to include an empty constructor to make my code work.

If you define a constructor with one or more parameters, you can use this constructor to initialize the contents of the class when you instantiate the class, and if the compiler defines a default constructor at random, it increases the likelihood that someone will skip this logic and create a bug. If you need a default constructor, it is preferable to explicitly define a default constructor.