Learn Java from Scratch - A Beginner's Guide - Step 12 - Encapsulation Exercises - Better Validation and Book Class

The video tutorial discusses issues with speed validation in code, highlighting the importance of encapsulation. It explains how to use the set speed method to ensure proper validation and avoid code repetition. The tutorial also covers managing book copies through simple methods, emphasizing encapsulation level 2, where business logic is contained within the class. The video concludes with exercises to practice these concepts.

What problem arises when decreasing speed without validation?

• The speed becomes too high.

• The speed becomes zero.

• The speed becomes negative.

• The speed remains unchanged.

How can encapsulation help in managing speed changes?

• By reusing validation logic through a method.

• By eliminating the need for any validation.

• By allowing direct access to speed variables.

• By increasing the complexity of the code.

What is the main advantage of using encapsulation in code?

• It makes the code longer.

• It makes the code harder to understand.

• It allows for easier logic changes without affecting external code.

• It requires more validation checks.

In the book copies exercise, what method is used to increase the number of copies?

• Ignoring validation checks.

• Using a set method with validation.

• Directly modifying the variable.

• Using a loop to increment.

What should be checked before decreasing the number of book copies?

• If the number of copies is equal to zero.

• If the number of copies is less than zero.

• If the number of copies is a negative number.

• If the number of copies is greater than zero.