Java Main Method Quiz

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What is the primary purpose of the main method in a Java program?

To handle exceptions
To declare user-defined functions
To initialize variables
To execute the program (correct)

Which of the following is the correct way to declare the main method in a Java program?

void main(String args)
public void main(String[] args)
public static main(String args)
public static void main(String[] args) (correct)

Which of the following is not a primitive type in Java?

double
int
float
String (correct)

What distinguishes dynamically typed languages from statically typed languages?

Dynamically typed languages allow for flexible variable types. (D) Signup and view all the answers

Which of the following accurately describes the purpose of reference types in Java?

To store pointers to memory locations (C) Signup and view all the answers

If a Java program has errors in the main method declaration, what issue is likely to occur?

Syntax errors during compilation (A) Signup and view all the answers

What will be printed if myNum is 15 in the given Java code snippet?

Your number is greater than 10 (A) Signup and view all the answers

Which of the following statements about the Vehicle class is true?

The Vehicle class has a constructor that initializes type and year (A) Signup and view all the answers

Why does encapsulation play a significant role in Java programming?

To prevent unauthorized access and modifications to data (C) Signup and view all the answers

Which of the following best describes encapsulation in Java?

'Encapsulation' refers to grouping variables and methods within a class (C) Signup and view all the answers

In Java, what is the purpose of getters and setters?

To provide controlled access to class variables (D) Signup and view all the answers

Which of the following best describes the role of constructors in Java?

Constructors are used to initialize objects (B) Signup and view all the answers

What is the main purpose of encapsulation in Object-Oriented Programming?

Enhancing modularity and code reusability (C) Signup and view all the answers

Which method in the Car class is responsible for checking if a car needs maintenance based on its mileage?

getMaintenance() (B) Signup and view all the answers

What is the purpose of the setYear() method in the Car class?

To set the car's year of manufacture (C) Signup and view all the answers

What does the getMaintenance() method output when a car's mileage is less than or equal to 100,000 miles?

'No maintenance required at this time.' (D) Signup and view all the answers

Which keyword in Java is used by a subclass to inherit methods and variables from its superclass?

extends (B) Signup and view all the answers

Which method in the Car class allows access to the make attribute of a Car object?

getMake() (B) Signup and view all the answers

Which statement about primitive types in Java is correct?

Primitive types are variable types in Java that store a value directly. (D) Signup and view all the answers

In the provided Java code snippet, what is the correct way to read user input?

int myNum = scn.nextInt(); (A) Signup and view all the answers

Which of the following is a type of loop not found in Java?

until loop (C) Signup and view all the answers

Which line of code correctly creates an ArrayList of integers in Java?

ArrayList myList = new ArrayList(); (C) Signup and view all the answers

What is the correct conditional statement in Java to check if myNum is greater than 10?

if (myNum > 10) { (B) Signup and view all the answers

Which of the following correctly prints both a number and its square in Java?

<code>System.out.println("Your number is: " + myNum + " Its square is: " + square);</code> (C) Signup and view all the answers

What does polymorphism allow in Java?

Objects of different classes to be treated as objects of a common superclass (B) Signup and view all the answers

Which method needs to be overridden in the subclasses Cat and Dog?

makeSound() (B) Signup and view all the answers

What are the instance variables in the Animal class?

Name and age (D) Signup and view all the answers

Which concept in Java allows for method overloading?

Inheritance (C) Signup and view all the answers

What is the purpose of the Animal reference variables in the practical question?

To store any object references (B) Signup and view all the answers

What happens when the makeSound() method is called on an Animal reference variable pointing to a Dog object?

It prints the sound of a Dog (D) Signup and view all the answers