If you want to master functional programming, the best place to start is with the Java Function interface. This example will show you four different ways to implement this functional interface in your ...

In this functional programming tutorial, we will work through a Java Supplier interface example. Java’s functional supplier interface can be used any time a function needs to generate a result without ...

including the difference between classes and interfaces, see my Java 101 tutorial Working with interfaces in Java. You access an enclosed interface by prefixing its name with the enclosing ...

An interface can never have a state ... an abstract class when you need to implement mutable state. As an example, the Java Collections Framework includes the AbstractList class, which uses ...

One cool feature in JSR-223 is to allow scripts to implement Java interfaces. For example, we wish to implement the ActionListener interface. What you have to do is to write the methods with ...