Only functional interfaces can use the lambda feature in Java. Abstract classes with only one abstract method cannot use lambdas. Can’t have constructor. Can have constructor. Can have abstract ...

Java 8 introduced Java developers to functional ... This Q&A also notes that currying “helps us create abstract functions.” In this tutorial you’ve learned some basics of functional programming.

It’s just that simple. Some people can find the simplicity of the Java Function interface to be a bit confusing. After all, a method that takes something and returns something else seems to be so ...