Chapter 4 Writing Classes Lecture

An object has:

• state & actions

• actions & behaviors

• start & finish

• state & behaviors

A class is

• a blueprint of an object.

• a copy of an object.

• an action.

• the model or pattern from which objects are

  created.

Which of the following are methods from the Coin class?

• a Coin constructor which is used to initialize the object

• a flip method which is used to flip the coin

• a isHeads method which is used to determine if the current face is heads

• all of these options are methods, even the constructor which is a block of code similar to a method that's called when an instance of an object is created

The ______________ of data is the area in a program in which

that data can be used (referenced)

• value

• scope

• instance

• void

A class declares the type of the data, ________

reserve memory space for it

• only when you specify, it will

• therefore it will sometimes

• therefore it will always

• but it does not

Can you access as private variable outside of it's class?

• Yes

• No

Members of a class that are declared with _______

visibility can be accessed from anywhere

• public

• private

• protected

• open

A method created simply to assist a service method

is called a ________ method

• parent

• public

• support

• service

Java is a(n) ______________________, which means that we can use Java to tell a computer what to do.

• compiler

• programming language

• app

• block-based de facto coding language

A _________ is used to define a type (classify something). The _________ defines what objects of the _______ need to know (data or fields) and do (behaviors or methods).

• program

• constructor

• method

• class