Day 4 – Advanced Class Features

Which of the following is an advanced class feature?

• Inner Classes

• Reflection

• Interfaces

• Abstract Classes

What are Inner classes?

• classes that can't be instantiated and are meant to be subclassed

•  classes defined within another class

Explain reflection

• are a special type of class that represent a fixed set of constants

•  a form of metadata that can be added to your Java code

•  allows you to inspect and manipulate classes, interfaces, fields, and methods at runtime

How lamda expression are used?

• used to provide additional information to the compiler, to other developers, or to runtime tools.

•  used to define anonymous functions that can be passed as arguments to methods.

• to write code that's reusable and more robust.

choose the correct way to declare static

• static initializer :

  static { counter = 0; }

• static variable :

  static int counter;

• static method :

  static { counter = 0; }

How does static variable is declared?

• static int counter;

• int static counter;

• int counter static;

How to declare static method ?

•  static void incrementCounter() { counter++; }

•  void static incrementCounter() { counter++; }

choose the correct way to declare final

• final class :

  final class MyClass {}

• final variable :

   final int myVariable = 10;

• final method :

  final void myMethod() {}

Choose the correct explanation about exceptions and assertions

•  exceptions are used to handle exceptional conditions or errors that occur during the execution of a program

• assertions are used to validate code about the state of your program

• assertions are used to validate assumptions about the state of your program

•  exception is an object that represents an abnormal condition

How do you create an enum type to use it in code?

• enum = Season { SPRING, SUMMER, FALL, WINTER }

• enum Season { SPRING, SUMMER, FALL, WINTER }

• enum Season = { SPRING, SUMMER, FALL, WINTER }

• enum Season : { SPRING, SUMMER, FALL, WINTER }