Question 1

What does the 'new' keyword do in Java?

Accepted Answer

Creates a new instance of a class

Answer

Compares two objects

Answer

Deletes an object

Answer

Creates a new class

Question 2

What is encapsulation in object-oriented programming?

Accepted Answer

The bundling of data and methods into a single unit (class)

Answer

The ability of an object to inherit properties and behaviors from another object

Answer

The ability of an object to take on many forms and types

Answer

The process of creating multiple instances of a class

Question 3

Which of these would result in a null object?

Accepted Answer

Dogs spot;

Answer

Dogs spot = new Dogs("Spot", 12);

Answer

String dog = "";

Answer

Dogs spot = new Dogs();

Question 4

What is a constructor in Java?

Accepted Answer

A special method used to initialize objects

Answer

A variable used to hold the current instance of a class

Answer

A keyword used to create a new class

Answer

A method used to compare two objects

Question 5

What is a method in object-oriented programming?

Accepted Answer

A function or behavior associated with an object or class

Answer

A keyword used to declare a class

Answer

A variable used to hold data in a class

Answer

A statement used to initialize an object

Question 6

What is the purpose of the 'toString()' method in Java?

Accepted Answer

It returns a string representation of an object.

Answer

It prints the data in the class.

Answer

Changes an object into a String.

Answer

It prints the instance variables of an object.

Question 7

What is an overloaded method?

Accepted Answer

A method that has the same name but different parameters

Answer

A method that can only be called once

Answer

A method that can be called from any class

Answer

A method that returns multiple values

Question 8

What is a void method?

Accepted Answer

A method that does not return a value

Answer

A method that takes no arguments

Answer

A method that throws an exception

Answer

A method that returns a value

Question 9

What would the compareTo method return for this statement: "phone".compareTo("phew");?

Accepted Answer

a positive integer

Answer

a boolean value

Answer

a negative integer

Answer

zero

Question 10

Which method can be used to find the index of the first occurrence of a specific character in a string in Java?

Accepted Answer

indexOf()

Answer

toUpperCase()

Answer

substring()

Answer

contains()

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