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Welcome to the Classes and Methods MCQs Page

Dive deep into the fascinating world of Classes and Methods with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of Classes and Methods, a crucial aspect of Java Programming. In this section, you will encounter a diverse range of MCQs that cover various aspects of Classes and Methods, from the basic principles to advanced topics. Each question is thoughtfully crafted to challenge your knowledge and deepen your understanding of this critical subcategory within Java Programming.

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Check out the MCQs below to embark on an enriching journey through Classes and Methods. Test your knowledge, expand your horizons, and solidify your grasp on this vital area of Java Programming.

Note: Each MCQ comes with multiple answer choices. Select the most appropriate option and test your understanding of Classes and Methods. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

Classes and Methods MCQs | Page 29 of 30

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Q281.
An abstract class in Java usually contains one or more abstract ____.
Discuss
Answer: (b).methods
Q282.
Does the below Java code with abstract method compile?
class Puppy
{
  abstract void showName();
}
Discuss
Answer: (a).NO
Q283.
What is the output of the below Java program with an abstract class?
abstract class Coffee
{
  Coffee()
  {
    System.out.println("Inside Constructor of Coffee..");
  }
}
class ColdCoffee extends Coffee
{
  ColdCoffee()
  {
    System.out.println("Inside Constructor of ColdCoffee..");
  }
}
public class AbstractClassTesting
{
  public static void main(String[] args)
  {
    ColdCoffee cf = new ColdCoffee();
  }
}
Discuss
Answer: (b).Inside Constructor of Coffee..
Inside Constructor of ColdCoffee..
Q284.
What is the output of the below Java program with an abstract class?
final abstract class Bell
{  }
class DoorBell extends Bell
{
  DoorBell()
  {
    System.out.println("DoorBell ringing..");
  }
}
public class AbstractClassTesting2
{
  public static void main(String[] args)
  {
    Bell bell = new DoorBell();
  }
}
Discuss
Answer: (c).Compiler error
Q285.
What is the output of the below Java program with an abstract class?
abstract class MathLibrary
{
  static final float PI = 3.1415f;
}

public class AbstractClassTesting3
{
  public static void main(String[] args)
  {
    System.out.println(MathLibrary.PI);
  }
}
Discuss
Answer: (c).3.1415
Q286.
What is the output of the below Java program with multiple abstract classes?
abstract class Editor
{
  abstract void show();
}

abstract class Author extends Editor
{
  abstract void print();
}

class Office extends Author
{
  void show()
  {
    System.out.println("Editor method");
  }
  void print()
  {
    System.out.println("Author method");
  }
}

public class AbstractClassTesting4
{
  public static void main(String[] args)
  {
    Editor ed = new Office();
    ed.show();

    Author au = new Office();
    au.print(); 
  }
}
Discuss
Answer: (c).Editor method
Author method
Q287.
An object of multi-level inherited abstract class can not be created in memory? State TRUE or FALSE.
Discuss
Answer: (a).TRUE
Q288.
An abstract class with 100% abstract methods is equivalent to ______.
Discuss
Answer: (c).Interface
Q289.
What is the output of the below Java program with an abstract class?
public abstract class AbstractClassTest5
{
  public static void main(String[] args)
  {
    System.out.println("Inside Main() method..");
  }
}
Discuss
Answer: (c).Inside Main() method..
Q290.
What is the output of the below Java code with an abstract class and inner class?
public abstract class AbstractClassTest6
{
  class Anonymous
  {
    int a=5;
  }
  public static void main(String args[])
  {
    System.out.print("Inner class is present.."); 
  } 
}
Discuss
Answer: (b).Inner class is present..

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