Quiz on Arrays, Inheritance, and Interfaces in Java

What is the starting index of an array in Java?

• None of the above

• 1

• 2

• 0

Which keyword is used to inherit properties from a superclass in Java?

• implements

• extends

• inherits

• super

Which method is used to sort an array in Java?

• sortArray()

• Arrays.sort()

• arraySort()

• sort()

What is the purpose of the 'final' keyword in Java?

• To define an interface

• To declare a constant

• To create an abstract class

• To inherit a class

Which of the following is NOT a type of inheritance in Java?

• Hierarchical Inheritance

• Circular Inheritance

• Multilevel Inheritance

• Single Inheritance

Which of the following cannot be overridden in Java?

• Static methods

• Public methods

• Protected methods

• Private methods

What is the main purpose of interfaces in Java?

• To implement encapsulation

• To define constants

• To create abstract classes

• To achieve multiple inheritance

Which of the following is a valid declaration of an array in Java?

• int[] arr;

• None of the above

• int arr[];

• Both A and B

What does the 'super' keyword refer to in Java?

• None of the above

• The child class

• The parent class

• The current class

Which of the following is true about abstract classes?

• They cannot have fields

• They cannot have constructors

• They can contain concrete methods

• They can be instantiated