Mastering Java: The Ultimate Quiz for 'Thinking in Java'

Data encapsulation in Java is the process of bundling code and data together into a single unit. This offers many benefits such as data hiding, improved security, and improved maintainability. Option A is incorrect because data encapsulation does not involve compressing data to save space. Option B is incorrect because while data encryption can be a feature of data encapsulation, it is not the main purpose. Option D is incorrect because data encapsulation does not involve storing multiple copies of the same data.