OOP Concepts in Java
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Questions and Answers

What is a class in Java comparable to in real life?

  • A set of attributes and methods
  • A variable declaration
  • An object itself
  • A blueprint for creating objects (correct)

    • What is the correct way to declare a class in Java?

  • class Main {
  • java class Main {
  • public class main {
  • public class Main { (correct)

    • What is an object in Java created from?

  • A variable declaration
  • A Java server
  • A class (correct)
  • A set of attributes and methods

    • What is the name of the Java file that should match the class name?

    <p>Main.java</p> Signup and view all the answers

    What is the initial value of the variable x in the class Main?

    <p>5</p> Signup and view all the answers

    What is the syntax to create an object of a class?

    <p>Main myObj = new Main();</p> Signup and view all the answers

    What is the output of the code: public class Main { int x = 5; public static void main(String[] args) { Main myObj1 = new Main(); Main myObj2 = new Main(); System.out.println(myObj1.x); System.out.println(myObj2.x); } }

    <p>5, 5</p> Signup and view all the answers

    What is the purpose of creating multiple objects of a class?

    <p>To create multiple instances of the class with different attributes</p> Signup and view all the answers

    What is the rule for naming a Java file?

    <p>The file name must match the class name</p> Signup and view all the answers

    What is the benefit of using multiple classes in Java?

    <p>It makes the code more organized</p> Signup and view all the answers

    What is the main difference between procedural programming and object-oriented programming?

    <p>Procedural programming is about writing procedures, while object-oriented programming is about creating objects</p> Signup and view all the answers

    What is the advantage of using OOP in terms of code maintenance?

    <p>OOP helps to keep the code DRY and makes it easier to maintain, modify, and debug</p> Signup and view all the answers

    What is the relationship between a class and an object in OOP?

    <p>A class is a template for objects, and an object is an instance of a class</p> Signup and view all the answers

    What is the principle of 'Don't Repeat Yourself' (DRY) in OOP?

    <p>Extracting out common codes and placing them at a single place to reuse them</p> Signup and view all the answers

    What is the characteristic of OOP that makes it possible to create full reusable applications?

    <p>OOP makes it possible to create full reusable applications with less code and shorter development time</p> Signup and view all the answers

    What is the programming language that is based on object-oriented programming?

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

    What is the term used for variables within a class?

    <p>Class Attributes</p> Signup and view all the answers

    How do you access attributes in a class?

    <p>Using the dot syntax (.)</p> Signup and view all the answers

    What is the output of running the 'Second.java' file?

    <p>It will print 5</p> Signup and view all the answers

    What is the term used for 'x' in the example Main class?

    <p>Class Attribute</p> Signup and view all the answers

    How do you compile 'Main.java' and 'Second.java' files?

    <p>Using the 'javac' command</p> Signup and view all the answers

    What is the name of the class created in the 'Second.java' file?

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

    What is the output of the code when we print the value of x in the following code: public class Main { int x = 5; public static void main(String[] args) { Main myObj = new Main(); System.out.println(myObj.x); } }

    <p>5</p> Signup and view all the answers

    What happens when we modify the attribute values in one object, but not in another?

    <p>The attribute values in only the modified object change.</p> Signup and view all the answers

    How many attributes can you specify in a class?

    <p>As many as you want</p> Signup and view all the answers

    What happens when we override the value of x with 25?

    <p>The value of x becomes 25.</p> Signup and view all the answers

    What is the purpose of the x attribute in the following code: public class Main { int x = 5; ... }?

    <p>To store an integer value</p> Signup and view all the answers

    What is the output of the code when we print the values of fname, lname, and age in the following code: public class Main { String fname = "John"; String lname = "Doe"; int age = 24; ... }?

    <p>Name: John Doe, Age: 24</p> Signup and view all the answers

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