Java 8 introduced ... a functional programming function. First-class functions are first-class citizens because they can appear wherever other first-class program entities (e.g., numbers) can ...

Also known as the Java 8 Predicate -- which stems from the JDK version where functional programming was introduced to developers -- this simple interface defines ... System.out.printf("Gretzky's ...

the program prints out 25. That’s all you really need to know about the java.util.function.Function interface. It is a very simple component that simply requires the implementation of one method — ...