Organizing interface, abstract, extends, and implements after returning to Java after a long time

When studying Java, these things often come up.interface abstract extends implementsEven if you have seen the names before, ...

[Java] Resolve your confusion between 'Interface vs Abstract Class' once and for all! A versatile mental model for the workplace

So, which one should I actually use: an interface or an abstract class?It's a massive wall that everyone hits at least once while learning Java. That is the 'Interface vs Abstract Class' problem.When ...