Java Mastery Challenge

What is the main principle of Object-Oriented Programming?

• Abstraction

• Inheritance

• Encapsulation

• Polymorphism

Which of the following is NOT a feature of OOP?

• Procedural programming

• Inheritance

• Object-oriented design

• Encapsulation

What keyword is used to create a class in Java?

• class

• create

• function

• define

What is inheritance in Java?

• Inheritance in Java is a way to define multiple classes with the same name.

• Inheritance allows a class to create new classes without any properties.

• Inheritance in Java allows a class to inherit properties and behaviors (methods) from another class.

• Inheritance is a method to delete properties from a class.

Which of the following is an example of polymorphism?

• A method that returns the area of a shape.

• A function that sorts an array of numbers.

• A class that inherits properties from another class.

• A function that calls a 'draw' method on different shape objects.

What is the purpose of the 'super' keyword in Java?

• The 'super' keyword is used to define interfaces.

• The 'super' keyword is used to access superclass methods and constructors.

• The 'super' keyword is used to declare variables.

• The 'super' keyword is used to create new classes.

What is encapsulation in Java?

• Encapsulation is the process of creating multiple classes in Java.

• Encapsulation is the bundling of data and methods that operate on that data, restricting direct access to some of the object's components.

• Encapsulation refers to the inheritance of properties from a parent class.

• Encapsulation is the method of optimizing code performance in Java.

Which access modifier allows access only within the same package?

• protected

• default (package-private)

• private

• public

What is method overloading?

• Method overloading requires methods to have the same parameters.

• Method overloading is a way to override methods in subclasses.

• Method overloading allows multiple methods with the same name but different parameters.

• Method overloading is when methods have different names.

What is the difference between an abstract class and an interface?

• An abstract class cannot have any methods, while an interface can.

• An abstract class can only be instantiated, while an interface cannot be instantiated.

• An abstract class can implement multiple interfaces, while an interface cannot implement any classes.

• An abstract class can have implemented methods and state, while an interface cannot.