Next make an Abstract method name it whatever you like. Using an already existing interface to perform this task is more intuitive than creating your own custom abstract class.In the original class make a method that takes the new class as a parameter, in this method call the abstract method. While there is nothing wrong with your solution, and it does provide an alternative, I don't see the value or reason for using this approach over an interface.Without lambda expressions: "A functional interface is an interface that has one and only one abstract method, although it can contain any number of default methods (new in Java 8) and static methods" what are you saying, that in Java 8 we now can have static methods in interfaces?Thanks to Java 8 you don't need to do the steps below to pass a function to a method, that's what lambdas are for, see Oracle's Lambda Expression tutorial.
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