Java abstract classes Vs interfaces Interview Q&As

Q1. When to use an abstract class over an interface? Q2. What is a diamond problem? Q3. Does Java support multiple inheritance? In design, you want the base class to present only an interface (or a contract) for its derived…

Answers are detailed to be useful beyond job interviews. A few Q&As each day will make a huge difference in 3 to 24 months to go places depending on your experience.