Can I call main class and inside other ?

Question

class Launcher{// can I call main class

class Alfa{ // is this suitable? }

class Delta{ // or can I use this type of class in main class. Supposed }

}

Answer 1

Yes, you can have nested/inner classes (classes inside other classes). See: https://docs.oracle.com/javase/tutorial/java/javaOO/nested.html