#147 Classes and Object

What is a class in Java?

• A method for creating variables

• A blueprint for an object

• A type of data structure

• A way to organize code

What are the two main components of a class?

• Variables and objects

• Methods and constructors

• Variables and methods

• Objects and blueprints

What is the purpose of the main method in Java?

• To define variables

• To create objects

• To run code

•  To declare methods

How do you create an object from a class in Java?

• new ClassName();

• ClassName object = create();

• object.ClassName();

• ClassName.newObject();

What does the "dot notation" (e.g., object.variable) allow you to do?

• Create new variables

• Access things the object knows and can do

•  Define new methods

• Modify the class blueprint

Can you create multiple objects from the same class?

• No, each class can only have one object

• Yes, but they will all share the same variables

• Yes, you can create multiple unique objects

• Only if the class has a special permission

What is the difference between a class and an object?

• Classes are blueprints, objects are made from classes

• Classes are variables, objects are methods

• Objects are blueprints, classes are made from objects

• There is no difference

What keyword is used to create a method that doesn't return anything?

• null

• void

•  empty

• noreturn

What are the basics of classes in Java?

•  Public and private keywords

•  Inheritance and polymorphism

• Variables and methods inside a class that objects know

• Constructors and destructors