why Interface Default methods?

Question

Learning java 8 default methods . This link like any other resource on internet says

In ‘the strictest sense’, Default methods are a step backwards because they allow you to ‘pollute’ your interfaces with code. But they provide the most elegant and practical way to allow backwards compatibility. It made it much easier for Oracle to update all the Collections classes and for you to retrofit your existing code for Lambda.

My understanding is that java 8 dev/designers provided the default method in interfaces so that all implementing class does not have to unnecessarily override same behavior, hence provide backward compatibility. For example :- if ForEach method would not have been default method, every collection implementing class had to implement it. Agreed .

To overcome that we could have had one class providing implementation of these default methods and then implementing class like arraylist etc could have extended that. This way we could have statisfy both java fundamentals i.e reusability and abstraction i.e keeping the interface pollution less

I am sure java 8 dev/designer have already thought about this as they are much more learned and i am missing something here. Can someone help here so that we developers can also be on top of it as this major change?

Answer 1

To overcome that we could have had one class providing implementation of these default methods and then implementing class like arraylist etc could have extended that.

Your suggestion would work only for standard JDK classes (since they usually extends some base classes such as AbstractCollection and AbstractList, were the implementation of the new methods can be added).

What about custom classes that implement JDK interfaces? If, for example, you have a class that implements List but doesn't extend some JDK List implementation, you should be able to switch to Java 8 without having to implement new methods in your class.

With default implementations of new methods in the List interface, you don't have to touch your custom class. You can later add a custom implementation to those methods if you are not satisfied by the default implementation.