Learn Java from Scratch - A Beginner's Guide - Step 02 - Java For Loop - Exercises Overview and First Exercise Prime Num

The video tutorial introduces exercises using loops, focusing on creating a Java class called My Number. It covers implementing methods to check if a number is prime, calculate the sum of numbers up to a given number, find the sum of divisors, and print a number triangle. The tutorial includes setting up a Java project, creating classes and methods, and testing the code with guard conditions.

What is the purpose of creating a class called 'My Number' in the exercises?

• To create a graphical user interface

• To perform operations on a single number

• To store a list of numbers

• To manage database connections

What is the sum of numbers up to 5?

• 10

• 15

• 20

• 25

When calculating the sum of divisors, which numbers are excluded?

• Prime numbers only

• All odd numbers

• All even numbers

• One and the number itself

Which of the following is true about a prime number?

• It is always an even number

• It is only divisible by one and itself

• It is divisible by any number

• It is a number greater than 100

What pattern does the number triangle follow?

• A circular pattern

• A sequence of even numbers

• A sequence of odd numbers

• A right-angle triangle pattern

What is the initial step in implementing the 'isPrime' method?

• Check if the number is greater than 100

• Check if the number is odd

• Check if the number is even

• Check if the number is less than 2

Which operator is used to check divisibility in the 'isPrime' method?

• Subtraction

• Addition

• Division

• Modulus

What is the purpose of a guard condition in programming?

• To increase the speed of execution

• To handle invalid input early

• To reduce memory usage

• To enhance user interface design

What should the 'isPrime' method return for negative numbers?

• True

• False

• The number itself

• An error message

What is the result of '9 mod 3'?

• 1

• 2

• 0

• 3