Java Fundamentals Challenge

What is the main principle of Object-Oriented Programming?

• Data encapsulation only

• Single inheritance only

• Encapsulation, inheritance, polymorphism, and abstraction.

• Static typing only

Which of the following is not a Java data type?

• integer

• float

• boolean

• string

What keyword is used to create a class in Java?

• class

• function

• create

• define

What is the default value of an int variable in Java?

• -1

• 1

• 0

• null

Which control structure is used to execute a block of code repeatedly?

• Loop

• Function

• Variable

• Condition

What is the purpose of the 'try' block in exception handling?

• The purpose of the 'try' block is to catch exceptions that may occur during code execution.

• To define a function in Python.

• To declare variables in a program.

• To optimize code performance.

What is inheritance in the context of Object-Oriented Programming?

• Inheritance allows a subclass to inherit attributes and methods from a superclass, enabling code reuse and establishing a class hierarchy.

• Inheritance is a method for creating new classes without any relationship to existing ones.

• Inheritance is the process of deleting attributes from a class.

• Inheritance allows a class to operate independently without any parent class.

Which of the following is a valid way to declare an array in Java?

• int[] numbers;

• int numbers = new int();

• int numbers[];

• array numbers int;

What is the result of the expression 5 / 2 in Java?

• 2.5

• 1.5

• 2

• 3

What is the purpose of the 'catch' block in exception handling?

• The 'catch' block is meant to optimize code performance.

• The 'catch' block is for logging errors only.

• The purpose of the 'catch' block is to handle exceptions and prevent program termination.

• The 'catch' block is used to define new exceptions.