Variables

Question 1

Local variables

Answer 1

A variable inside of a method or constructor that can’t be accessed outside of that method or constructor. It must be assigned before it is used.

Question 2

Instance variables

Answer 2

Instance variables are the attributes of the object. They change based on which instance of the class you are looking at.

Numbers are initialized to 0.
Reference variables are initialed to null.

Question 3

Static variables

Answer 3

Static variables are special because they do not need to be called on a specific object of a class, but can be called on the class. They are constants that don’t change. For example, Integer.MAX_VALUE;

Numbers are initialized to 0.
Reference variables are initialed to null.

Question 4

Reference variables

Answer 4

They point to objects( Including things like Cat, String, and Integer, but not int, char, or other primitive types.

Question 5

Primitive variables

Answer 5

They point to primitive values like int, char, long, and double.

Question 6

Formal parameters/method parameters

Answer 6

These are the types and names of the parameters in a method.

Question 7

Actual parameters

Answer 7

These are the values passed in to a method

Question 8

Access Specifiers

Answer 8

The ‘public’ or ‘private’ at the beginning of methods or classes that tell where it can be accessed.

Question 9

public

Answer 9

Once the class is imported, can be used

Question 10

Private

Answer 10

Can not be used outside of the class, imported or not

Question 11

encapsulation

Answer 11

This is when you hide some unnecessary details for users by making methods and other things private.

Question 12

Declaring Class

Answer 12

The class a method is in

Question 13

mutator/setter methods

Answer 13

methods that allow users to change an instance variable according to the code inside.

Question 14

accessor/getter

Answer 14

Methods that allow users to see a instance variable, but not change it.