Java 8 default methods vs. non-abstract methods in abstract classes

Question

Java 8 interface default methods vs. non-abstract methods in abstract classes - are there any differences between the two (besides the differences of iface - class, visibili

Answer 1

The main differences are: Java 8 default methods of interfaces are public, while non-abstract (concrete) methods of abstract classes can be defined as public, protected or private. Lambda expressions got introduced in Java 8, to use lambda features we need default methods(to preserve backward compatibility), non-abstract methods of abstract classes can not serve the purpose.