IT1712 Object-Oriented Programming Concepts Quiz

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Questions and Answers

What is the correct way to import all classes from a package in Java?

  • import allClasses.*;
  • import allClasses.package_name;
  • import package_name.*; (correct)
  • import package_name.allClasses;

How should class files be named in Java according to the provided information?

  • Their names should match the class they contain.
  • Each class file should be named 'class.java'.
  • They should start with the name of the package. (correct)
  • They should have unique names for each class.

What is the purpose of the 'import' statement in Java?

  • To declare variables.
  • To create new classes.
  • To specify access rights for classes.
  • To include external libraries in a Java program. (correct)

Where should the classes in a package be placed according to Java conventions?

<p>In a separate folder with the same name as the package. (B)</p> Signup and view all the answers

How does Java handle the scenario where a class needs to access another class from a different package?

<p>The 'import' statement must be used to access classes from different packages. (D)</p> Signup and view all the answers

What is the purpose of a class in object-oriented programming?

<p>To define a kind of object and serve as a blueprint for creating objects (D)</p> Signup and view all the answers

How are objects of the same kind related in object-oriented programming?

<p>They have the same data type and belong to the same class (C)</p> Signup and view all the answers

What is the purpose of using inheritance between classes?

<p>To allow objects of a class to acquire properties from another class (A)</p> Signup and view all the answers

What does an interface contain in object-oriented programming?

<p>The headings for a number of public methods (B)</p> Signup and view all the answers

How is a package defined in object-oriented programming?

<p>A collection of related classes and interfaces grouped together into a folder (D)</p> Signup and view all the answers

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Study Notes

Classes and Packages

  • Each class in a package is placed in a separate file, and the file name begins with the class name.
  • To use classes from a package, an import statement is required, with the syntax being import package_name.class_name_or_asterisk;.
  • Classes in a package can be used in any program or class definition, regardless of the folder location.

Object-Oriented Programming Concepts

  • Object-Oriented Programming (OOP) is a methodology that defines objects with behaviors and interactions to accomplish a task.
  • An object has characteristics (attributes) and actions (behaviors), with values of attributes giving the object a state.

Objects and Classes

  • Objects of the same kind belong to the same class, with the same data type.
  • A class defines a kind of object, serving as a blueprint for defining objects.
  • The data type of an object is the name of its class.

Inheritance

  • Inheritance allows objects of a class to take on properties of objects from another class.
  • Inheritance is used to avoid repetition of programming instructions for each class.
  • The extends keyword is used to apply inheritance between classes.

Interfaces

  • An interface is a program component that contains headings for public methods.
  • Interfaces describe public methods in a class, and are used by another class through the implements keyword.

Packages

  • A package is a collection of related classes and interfaces grouped together in a folder.
  • The name of the folder is the name of the package.

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