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Using an already existing interface to perform this task is more intuitive than creating your own custom abstract class.So for instance, commons-collections has org.apache.commons.collections. Collection Utils, which has lots of static methods that take objects passed in, to pick one at random, there's one called exists with this signature: I know this is a rather old post but I have another slightly simpler solution.You could create another class within and make it abstract.In response to your comment below you could say: import reflect.


A lambda expression can quickly implement the abstract method, without all the unnecessary syntax needed if you don't use a lambda expression. Int Consumer; class B { public void dans Method(int i, Int Consumer a Method) { /* you can now call the passed method by saying a Method.accept(i), and it will be the equivalent of saying A.method To Pass(i) */ } } "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. Keep in mind you would be best off creating an interface for your particular usage.If you chose to go with callable, then you'd replace T above with whatever type of return value you expect, such as String.


The rest of this post describes what we used to have to do in the bad old days in order to implement this functionality.

Typically you declare your method as taking some interface with a single method, then you pass in an object that implements that interface.


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