[java] When to use: Java 8+ interface default method, vs. abstract method

There are a few technical differences. Abstract classes can still do more in comparison to Java 8 interfaces:

  1. Abstract class can have a constructor.
  2. Abstract classes are more structured and can hold a state.

Conceptually, main purpose of defender methods is a backward compatibility after introduction of new features (as lambda-functions) in Java 8.

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