Quite often a Java Stream or other component needs an object passed to it in order to perform some type of calculation or process, but when the process is complete, nothing gets returned from the ...

Java 8 default methods, which allow interfaces to contain (instance) method implementations, are useful for the skeletal implementation software design pattern.

We are having an interface with default methods and we implemented that interface in both Java and Kotlin classes and we provided the implementation for the non default methods. When we run in debu ...

The default method role offered by interfaces has given new life to the Java Collections Framework. You might consider this role for your own legacy interface-based libraries.

Interfaces always contained only method declaration and there was no way of defining method definition in the interfaces because java did not allow multiple inheritance of classes. java only allowed ...