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JUnit and Arraylists
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JUnit and Arraylists

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Questions and Answers

What is the primary purpose of Javadoc?

  • To compile Java code
  • To deploy Java code
  • To test Java code
  • To generate documentation for Java code (correct)

    • What is the primary purpose of overriding a method in object-oriented programming?

  • To define a new class that inherits from an existing class
  • To create multiple methods with the same name but different parameters
  • To create an array of objects
  • To provide a different implementation of a method for a specific subclass (correct)

    • What is an example of an association type in UML?

  • Abstraction
  • Composition (correct)
  • Aggregation
  • Inheritance

    • What type of association is depicted by a 'Person hasRead() Book' relationship?

    <p>Has-a type of association</p> Signup and view all the answers

    What is the main difference between unit testing and integration testing?

    <p>Unit testing tests individual components, while integration testing tests the entire system</p> Signup and view all the answers

    What is the main difference between an array of primitives and an array of references?

    <p>An array of primitives holds actual values, while an array of references holds references to objects</p> Signup and view all the answers

    What is the purpose of the ArrayList class in Java?

    <p>To create a dynamic array that can grow or shrink in size</p> Signup and view all the answers

    What is a key feature of JUnit 5?

    <p>It is a testing framework for Java</p> Signup and view all the answers

    What is the purpose of UML notation in object-oriented analysis and design?

    <p>To provide a visual representation of class and object relationships</p> Signup and view all the answers

    What is an interface in Java?

    <p>A construct that defines a contract that must be implemented</p> Signup and view all the answers

    What is the term for the direction of flow of data between classes in UML?

    <p>Parameter Directionality</p> Signup and view all the answers

    What is inheritance in Java?

    <p>A mechanism to create a new class from an existing class</p> Signup and view all the answers

    What type of relationship is depicted by a 'Car is-a Vehicle' relationship?

    <p>Is-a type of association</p> Signup and view all the answers

    What is the term for a collection of objects in Java?

    <p>Java Collection</p> Signup and view all the answers

    What is the purpose of UML?

    <p>To design and visualize software systems</p> Signup and view all the answers

    What is the term for a method that has the same name but different parameters?

    <p>Method Overloading</p> Signup and view all the answers

    What is the primary focus of unit testing?

    <p>Examining a small 'unit' of application to verify it meets requirements</p> Signup and view all the answers

    What is JUnit used for?

    <p>Automated unit testing</p> Signup and view all the answers

    What is the purpose of writing test cases in JUnit?

    <p>To verify the code meets requirements</p> Signup and view all the answers

    How do you create a JUnit test case in Eclipse?

    <p>Right-click the class and select 'New' =&gt; 'JUnit Test Case'</p> Signup and view all the answers

    What is the difference between an ArrayList and an array?

    <p>ArrayList can dynamically resize, while an array has a fixed size</p> Signup and view all the answers

    What is the purpose of assert methods in JUnit?

    <p>To verify the condition being tested</p> Signup and view all the answers

    What is the benefit of using JUnit for unit testing?

    <p>It helps to find bugs earlier in the development process</p> Signup and view all the answers

    What is the main goal of testing in software development?

    <p>To build robust software</p> Signup and view all the answers

    What is the primary difference between a super-class and a sub-class in inheritance?

    <p>A super-class is a more general class, while a sub-class is a more specific class.</p> Signup and view all the answers

    What is an example of static polymorphism?

    <p>Method overloading</p> Signup and view all the answers

    What is a characteristic of an abstract class?

    <p>It can have both abstract and non-abstract methods.</p> Signup and view all the answers

    What is the primary focus of unit testing in software development?

    <p>Testing individual units of code, such as classes and methods</p> Signup and view all the answers

    What is a characteristic of an interface?

    <p>It can have only abstract methods.</p> Signup and view all the answers

    What type of testing involves putting individual units of code together to test their interactions?

    <p>Integration testing</p> Signup and view all the answers

    What is an important aspect of testing array indices in Java?

    <p>Testing the boundary conditions, such as -1, 0, and 1</p> Signup and view all the answers

    What is the purpose of the super keyword in Java?

    <p>To access the parent class's constructor.</p> Signup and view all the answers

    What is the purpose of an interface in Java?

    <p>To define a set of abstract methods that must be implemented by any class that implements it</p> Signup and view all the answers

    What is an example of dynamic polymorphism?

    <p>Method overriding</p> Signup and view all the answers

    What is the primary benefit of using JUnit 5 for unit testing?

    <p>It provides a framework for testing individual units of code</p> Signup and view all the answers

    What is the purpose of abstract methods in an abstract class?

    <p>To be overridden by child classes.</p> Signup and view all the answers

    What is the term for a collection of objects in Java?

    <p>Collection</p> Signup and view all the answers

    What is the difference between an abstract class and an interface?

    <p>An abstract class can have both abstract and non-abstract methods, while an interface can have only abstract methods.</p> Signup and view all the answers

    What type of relationship is depicted by a 'Car is-a Vehicle' relationship in UML?

    <p>Inheritance</p> Signup and view all the answers

    What is the primary focus of acceptance testing in software development?

    <p>Evaluating the system's compliance with business requirements</p> Signup and view all the answers

    Study Notes

    Object-Oriented Programming (OOP) Concepts

    • Overriding: inheriting a method and customizing it to meet the local needs of a subclass
    • Overloading: methods in the same scope sharing a common name but having different method signatures

    Arrays

    • Simple homogeneous collection
    • Array of primitives: holds actual values
    • Array of references: holds references of addresses to objects

    UML (Unified Modeling Language)

    • Visual representation of class/object relationships
    • Used for object-oriented analysis and design

    UML Notation

    • Class diagram: represents high-level concepts, interfaces, and implementations
    • Class operations: methods that can be performed on a class
    • Parameter directionality: indicates the direction of data flow
    • Class visibility: indicates the accessibility of a class

    UML Class Diagram Perspectives

    • Conceptual: represents high-level concepts in the domain
    • Specification: focuses on interfaces of Abstract Data Types (ADTs) in the software
    • Implementation: describes how classes will implement their interfaces

    UML Relationships

    • Super vs subclass: indicates inheritance relationships
    • Interface and implementing class: indicates implementation relationships
    • Part-of type of association: indicates composition relationships
    • Is-a type of association: indicates inheritance relationships

    Class Diagram Example: Order System

    • Cardinality: indicates the number of relationships between classes
    • One-to-one: one instance of one class is related to one instance of another class
    • One-to-many: one instance of one class is related to multiple instances of another class
    • Many-to-many: multiple instances of one class are related to multiple instances of another class

    ArrayList

    • An example of a Java Collection
    • A dynamic array that can grow or shrink in size

    Testing

    • The process of examining a software system to ensure it meets the requirements
    • Unit testing: testing individual units of a program (classes, methods)
    • JUnit: a facility for automated unit testing
    • Test plan: a comprehensive strategy for ensuring that the system does not contain errors

    JUnit Testing

    • Steps to write tests using JUnit 5:
      • Open project on Eclipse
      • Select the class to test
      • Right-click class => New => JUnit test cases => edit the test methods as required
    • Using JUnit to test for expected conditions and assertions

    Javadoc

    • API documentation: provides information about the functionality and usage of a software system
    • Generation of Javadoc: automatically generates documentation for a Java program

    OOP Concepts Summary

    • Inheritance: super-class, sub-class, and the use of the super keyword
    • Polymorphism: taking multiple forms, including static polymorphism (method overloading) and dynamic polymorphism (method overriding)
    • Abstract class: providing abstract methods that will be overridden in child classes
    • Interface: only abstract methods and public static final variables

    Testing Models

    • V model (Waterfall): a sequential testing model
    • Iterative Development Model (Agile): an iterative testing model
    • Test plans: comprehensive strategies for ensuring that the system does not contain errors

    Boundary Conditions

    • Identifying boundary conditions in developing good tests for code
    • Testing with data that probes the boundary conditions
    • Examples of boundary conditions: array indices, int values

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    Related Documents

    AC-S24-OOP-Lect04-Part1-Testing-Javadoc.pdf

    Description

    This quiz covers fundamental OOP concepts, including method overriding and overloading, arrays, and UML. Test your understanding of these essential programming principles.

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