Complete Java SE 8 Developer Bootcamp - Encapsulation and Data Hiding

The video tutorial explains the concepts of encapsulation and data hiding in object-oriented programming. Encapsulation involves bundling data with methods, while data hiding restricts direct access to object data. Access modifiers like public and private control data visibility. The MyDate class example illustrates how encapsulation improves program quality by preventing invalid data manipulation. The tutorial also highlights issues with direct data access and discusses memory efficiency and flexibility in data types.

What is the primary purpose of encapsulation in object-oriented programming?

• To bundle data with methods that operate on that data

• To allow direct access to object data

• To make all data public

• To hide methods from other classes

In the 'my day' class example, what was the issue with having public fields?

• It made the data immutable

• It prevented the code from compiling

• It allowed any code to manipulate the data

• It made the code run faster

What problem arises when someone creates a date like February 29th, 2017?

• It is a valid date in all years

• It automatically adjusts to February 28th

• It causes a runtime error

• It does not exist in non-leap years

Why is it problematic to directly increment a day in a date object?

• It is not allowed in Java

• It always results in a valid date

• It can lead to non-existent dates like January 32nd

• It automatically adjusts the month

What is a potential issue when changing an int to a byte in a class?

• It increases memory usage

• It requires casting to store int values

• It has no impact on existing code

• It makes the code run slower

How does changing a data type from int to byte affect existing code?

• It improves code performance

• It has no effect on the code

• It breaks the code if not cast properly

• It automatically updates all related code

What is the literal type of the number 11 in Java?

• Short

• Int

• Long

• Byte