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Java Programming Fundamentals: Constructors, Accessors, and Mutators, Exams of Advanced Education

Harvard UniversityAdvanced Education

A comprehensive overview of key java programming concepts, including the differences between constructors, accessors (getters), and mutators (setters), as well as the relationship between classes and their instances. It also covers the importance of making fields private and the role of default constructors. Detailed explanations and examples related to these topics, making it a valuable resource for students and learners seeking to deepen their understanding of java programming fundamentals. The content is structured in a clear and concise manner, addressing common questions and providing practical insights that can be applied in real-world programming scenarios.

Typology: Exams

2024/2025

Available from 10/14/2024

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PRITE 2024 HW 4 Exam with 100%
Correct Answers!!
1. What does it mean for a local variable to shadow a field? - ✔✔The
local value hide the value of the instance field it is named after.
2. What is the difference between a constructor, accessor (getter), and
mutator (setter)? - ✔✔A constructor performs operation at the time
the object is created (it has no return type and is not given any
instructions is created as default). It initializes fields. Accessor all you to
retrieve the data from the field it is held in(has a return type). A
mutator allows you to manipulate the data is the instance fields (void
return type).
3. What is the difference between a class and an instance of the class? -
✔✔A class is a blueprint for the instances of the class. The class would
be a cookiecutter and the cookies would the instance of the class
(object).
4. Is it a good idea to make fields private? Why or why not? - ✔✔It
makes the access to the data in the field limited. The only way a person
can get the data is by utilizing one of the methods (protect the data).
5. If a class has a private field, what has access to the field? - ✔✔The
methods in the class.
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Download Java Programming Fundamentals: Constructors, Accessors, and Mutators and more Exams Advanced Education in PDF only on Docsity!

PRITE 2024 HW 4 Exam with 100%

Correct Answers!!

  1. What does it mean for a local variable to shadow a field? - ✔✔The local value hide the value of the instance field it is named after.
  2. What is the difference between a constructor, accessor (getter), and mutator (setter)? - ✔✔A constructor performs operation at the time the object is created (it has no return type and is not given any instructions is created as default). It initializes fields. Accessor all you to retrieve the data from the field it is held in(has a return type). A mutator allows you to manipulate the data is the instance fields (void return type).
  3. What is the difference between a class and an instance of the class? - ✔✔A class is a blueprint for the instances of the class. The class would be a cookiecutter and the cookies would the instance of the class (object).
  4. Is it a good idea to make fields private? Why or why not? - ✔✔It makes the access to the data in the field limited. The only way a person can get the data is by utilizing one of the methods (protect the data).
  5. If a class has a private field, what has access to the field? - ✔✔The methods in the class.
  1. What is the use of constructors? - ✔✔To perform an operation at the time of a object instantiation.
  2. What is meant by the default constructor? - ✔✔When a constructor is not defined, Java automatically provides a default constructor with all fields set to zero and all booleans set to false.
  3. Look at the following partial class definition, then respond to the questions that follow it: public class Book { private String title; private String author; private String publisher; private int copiesSold; } A. Write a constructor for this class. The constructor should accept an argument for each of the fields. B. Write accessor and mutator methods for each field. - ✔✔a. public Book(String ti, String au, String pub, int copies){ title=ti;

public String getAuthor(){ return author; } public String getPublisher(){ Return publisher; } public int getCopiesSold(){ Return copiesSold; }