Mastering Java 2026 – 400 Free Practice Questions to Pass the 'Thinking in Java' Exam

Implementation hiding is a design principle that allows developers to hide the implementation details of a class or module from client code. This means that the internal workings of the code, also known as the implementation, can be changed without affecting the client code. This is because the client code only interacts with the public interface of the class or module. Options A, B, and C are incorrect because they do not fully encompass the concept of implementation hiding. While a public interface is important for accessing the functionality of a class or module, it is not the only factor that allows for changes in implementation. Private members and protected members are also important for encapsulation and data hiding, but they do not solely allow for changes in implementation. Therefore, the most accurate and complete answer is D.