30 Questions
Which keyword is used to implement an interface in Java?
implements
What is the default accessibility of variables in an interface?
public
Can a class implement multiple interfaces in Java?
Yes
Can an interface implement another interface in Java?
No
What is the purpose of method overriding in Java?
To reduce unwanted code
What is an abstract class in Java?
A class that contains only abstract methods
Which programming paradigm focuses more on the data and related methods rather than procedures?
Object-oriented programming
What is a class in Java?
A template that has certain attributes
What is an object in Java?
An instance of a class
What is the purpose of OOPs in Java?
To make the program reusable, easier to modify and debug
What does the 'private' keyword indicate in Java?
The method can only be accessed by the class itself
What is the output of the following code?
Bank obj = new Bank();
obj.getData();
obj.deposit(1500);
float amount = obj.calculateAmount(300, 4, 2);
System.out.println(amount);
600
Which type of constructor is used to initialize an object with 0 or null values?
Default constructor
What is the purpose of constructors in Java?
To initialize objects
What is the return type of the addAmount() method in the Bank class?
void
What is the formula to calculate the amount for a particular principal amount, rate of interest, and time?
$amount = principal + (principal * rate * time) / 100$
Why are the data members of the Bank class declared as 'private'?
To provide security
What is the purpose of the displayData() method in the Bank class?
To display all the members of the class
Which of the following is an example of data encapsulation in Java?
Declaring class attributes as private and getter and setter methods as public
What is the purpose of using getter and setter methods in Java?
To get and set the values of private data members
Which keyword is used to implement inheritance in Java?
extends
In the given code, what is the output of the following statement: 'System.out.println(S.getNoOfItems());' ?
153
What is the purpose of using inheritance in Java?
To increase the reusability of code
What is the value of 'b' in the output of the following statement: 'objMS.get();' ?
20
Which type of inheritance is demonstrated in the example code?
Hierarchical inheritance
What is the purpose of abstract classes in Java?
To hide complex background details
What happens if a subclass tries to inherit private data members from its parent class?
The subclass cannot inherit the private data members
What is the difference between runtime polymorphism and compile-time polymorphism?
Runtime polymorphism occurs during inheritance, while compile-time polymorphism occurs during method/function overriding
What is the purpose of the @Override annotation in Java?
To indicate that a method is overridden
What is the result of executing the code in the example?
All of the above
Test your knowledge on Java programming with this quiz!
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
