Object-Oriented Programming Revision

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Questions and Answers

What is one of the benefits of standardizing on Eclipse as an IDE?

Lower development costs

More programming languages supported

Enhanced code performance

Ensure Uniformity (correct)

What is a key characteristic of high-level programming languages?

Direct execution by the hardware

Limited functionality compared to assembly languages

More human-readable syntax (correct)

Dependency on assembly language

Which statement best describes an object in Java?

An object is a collection of fields and behaviors. (correct)

Each object shares all of its attributes with others.

An object cannot contain methods.

Objects cannot hold their own data.

In Java, what does a compiler do?

Translates code written in one language to another Signup and view all the answers

What are the legal structures and commands in programming referred to as?

Syntax Signup and view all the answers

What type of error is caused by a flaw in the program's structure that leads the compiler to fail?

Syntax error Signup and view all the answers

What is the purpose of escape characters in Java?

To represent special characters in strings Signup and view all the answers

Which statement is true regarding the characteristics of a variable?

A variable consists of a name and a type. Signup and view all the answers

Which of the following are benefits of modern Object-Oriented Programming (OOP)?

Encapsulation Signup and view all the answers

What distinguishes a constructor in Java?

A type of method used to construct objects. Signup and view all the answers

What does the private keyword signify in Java?

The private member can be accessed by any method in the class that contains it. Signup and view all the answers

Which statement is true regarding the method getMessage()?

It returns the value of its associated attribute. Signup and view all the answers

What is the correct function of the mutator method setMessage()?

It has no return type and changes the value of its associated attribute. Signup and view all the answers

What does the public keyword denote for a class, data, or method in Java?

The class, data, or method is visible to any class in any package. Signup and view all the answers

Which statement is true about inner classes in Java?

An inner class can access the public members of the outer class. Signup and view all the answers

When is it appropriate to utilize enum types in Java?

When you need to represent a fixed set of constants. Signup and view all the answers

Which statement accurately describes method overriding in Java?

A method can be overridden only if it is accessible in the subclass. Signup and view all the answers

What statement is true regarding static methods and inheritance in Java?

Static methods, when redefined in the subclass, hide the method from the superclass. Signup and view all the answers

What is the fundamental difference between method overriding and method overloading?

Overloading occurs when two methods in the same class have the same name but different parameters, while overriding involves modifying inherited methods. Signup and view all the answers

What does the garbage collector in Java primarily do?

It reclaims memory from objects that no longer have a reference pointing to them. Signup and view all the answers

What triggers garbage collection in Java?

When System.gc() is invoked. Signup and view all the answers

Which statement about the garbage collector in Java is correct?

It runs periodically as a background thread. Signup and view all the answers

Which statement is true about the finalize() method in Java?

It is defined in the java.lang.Object class and returns void. Signup and view all the answers

What is the correct way to define an array in Java?

Arrays are fixed in size and cannot be modified after creation. Signup and view all the answers

Which statement accurately describes arrays in Java?

Arrays are objects that occupy memory. Signup and view all the answers

How can a histogram be effectively used to represent array data?

By plotting each numeric value as a bar of asterisks (*). Signup and view all the answers

Which statement is correct regarding overloaded constructors in Java?

Overloaded constructors can share the same name but must differ in parameter lists. Signup and view all the answers

What is the correct understanding of object aggregation in Java?

Creating an instance of one class as a reference in another class. Signup and view all the answers

What is the accurate relationship between a superclass and a subclass in Java?

A subclass inherits data fields and methods from its superclass. Signup and view all the answers

Which statement about method overriding in Java is true?

A method can only be overridden if it is accessible in the subclass. Signup and view all the answers

Which of the following relates to the java.lang.Object class?

It is the base class for all Java objects. Signup and view all the answers

What does polymorphism allow developers to achieve in Java?

Execute a single action in various ways. Signup and view all the answers

Study Notes

Object-Oriented Programming (OOP) Revision

Eclipse is a powerful, open-source IDE supporting Java and other object-oriented languages
Eclipse standardization ensures uniformity, leverages specific features, and enhances collaboration
Three main types of computer languages exist: Machine, Assembly, and High-Level
Programming has evolved through stages, including Machine Code, Assembly Language, and higher-level languages emphasizing procedures, functions, and objects
Java and OOP are important due to their emphasis on inheritance, cloning objects, code reusability, and characteristic features
Core Java features include: Object-Oriented, Interpreted, Portable, Secure, Dynamic, Reliable, and Multi-threaded
Classes consist of attributes, methods performing tasks, and methods returning completion information

Programming Language Concepts

Translation tools like compilers convert between languages
Programming language semantics govern the set of legal commands and structures
Syntax errors result from structural program limitations preventing compiler execution

Data Types and Variables

Strings represent sequences of text
Character arrays similarly store text characters
Java escape characters include \t (tab), \n (newline), " (double quote) and \ (backslash)
Variables possess names, data types, sizes, and values

Objects and Classes in Java

Java objects are collections of fields (representing state) and methods (describing behavior)
Java objects are instances of classes
The Object class is a fundamental class in Java

Benefits and Features of OOP

Code reusability
Encapsulation
Inheritance
Polymorphism
OOP benefits from constructors to instantiate objects, and has private and other keywords to manage accessibility of object members
Polymorphism enables a method to have different implementations in subclasses
The Garbage Collector reclaims memory from unreferenced objects
The finalize() method is executed for resources when an object is garbage collected
Arrays in Java are objects occupying memory used to store collections of data

Abstract Classes

Abstract classes cannot be instantiated directly but serve as templates for concrete subclasses
Their purpose facilitates defining inheritance hierarchies

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Description

This quiz covers key concepts of Object-Oriented Programming (OOP) including important features of Java, the structure of classes, and the evolution of programming languages. It also discusses the role of IDEs like Eclipse in developing OOP applications. Test your knowledge on essential programming language concepts and their applications.