MODULE 2 (Week 3): Assessors, Mutators and Constructors

Question 1

To create an instance of a class:

Answer 1

Supply a type and an identifier

Allocate computer memory for the object

Use the new operator

Question 2

The name for a memory address where the object is held

Answer 2

Reference to the object

Question 3

A method that creates and
initializes class objects

Answer 3

Constructor method

Question 4

The name of the constructor should always be what?

Answer 4

The name of the class whose objects it constructs

Question 5

After an object is instantiated,
its methods can be accessed
using:

Answer 5

The object’s identifier

A dot

A method call

Question 6

Data fields are usually private; The client application accesses them only through:

Answer 6

Public interfaces

Question 7

Controls the data values used to set a variable

Answer 7

Set method

Question 8

Controls how a value is retrieved

Answer 8

Get method

Question 9

A type of constructor that requires no arguments and is created automatically by a Java compiler whenever you do not write a constructor

Answer 9

Default constructors

Question 10

What are the initial default values that a default constructor provides to an object’s data fields

Answer 10

Numerical field - set to 0

Character fields - set to Unicode \u0000

Boolean fields - set to false

Nonprimitive object fields - set to null

Question 11

A construction method:

Answer 11

Must have the same name as the class it constructs

Cannot have a return type

Has a public access modifier

Question 12

Classes that you create become data types and are often referred to as:

Answer 12

Abstract data types (ADTs)

Question 13

Data types not built into the language

Answer 13

Programmer-defined data type

Question 14

How to declare an object from one of your classes?

Answer 14

Provide the type and identifier