30 Questions
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 does OOPs make the Java program?
Reusable, easier to modify and debug
What does the deposit method in the Bank class do?
Adds the specified amount to the balance
What does the calculateAmount method in the Bank class do?
Calculates the amount with simple interest
Which keyword is used to implement an interface in Java?
implements
What is the purpose of method overriding?
To reduce unwanted code in a program
Which of the following is true about interfaces in Java?
Interfaces can be extended by other interfaces
What are the default access modifiers for variables in an interface?
public and final
Can a class implement more than one interface in Java?
Yes, Java allows a class to implement multiple interfaces
Can an interface implement another interface in Java?
No, an interface cannot implement another interface
Which of the following is NOT a type of constructor in Java?
Inherited constructor
What is the purpose of constructors in Java?
To initialize objects
Which type of constructor is used to initialize objects with default values?
Default constructor
Which type of inheritance is shown in the example where class B is derived from class A and class C is derived from class B?
Multi-level inheritance
What is the purpose of data abstraction in object-oriented programming?
To show only the essential features while hiding the complex background details
What is the return type of a constructor in Java?
None of the above
What is the purpose of the displayData() method in the Bank class?
To display all the members of the class
Which type of polymorphism is demonstrated in the example where different subclasses of Animal have their own implementation of the 'eats()' method?
Runtime polymorphism
What happens if a class is declared as 'final' in Java?
It cannot be inherited from
What is the formula for calculating the amount for a particular principal amount, rate of interest, and time in the Bank class?
$amount = principal + (principal * rate * time) / 100$
What is the purpose of the '@Override' annotation in Java?
To override a method in the subclass
Why does Java not support multiple inheritance?
It creates confusion when there exist methods with the same name and the same arguments in superclasses and subclasses
Which keyword is used to implement encapsulation in Java?
private
What is the purpose of getter and setter methods in encapsulation?
To get and set the values of data members
What is the output of the program?
Amount calculated for Rs 300/- at a rate of 4.5% for 2 years is: 324.0 Name: null Account number: 0 Balance: 1500.0 Name: Tom Account number: 12345 Balance: 1000.0 Name: Harry Account number: 98765 Balance: 2000.0 Name: Tom Account number: 12345 Balance: 1000.0
324.0
What is the purpose of inheritance in Java?
To increase reusability of code
Which keyword is used to inherit properties from a parent class in Java?
extends
What is the output of the program?
a: 10 b: 20 Model Name: Alto Mileage: 150 c: 15 d: 25 Model Name: Verna Mileage: 200
a: 10 b: 20 Model Name: Alto Mileage: 150 c: 15 d: 25 Model Name: Verna Mileage: 200
Test your knowledge of Java programming by answering questions about object-oriented concepts and methods.
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