In this Java 101 tutorial, I’ve explained how interfaces differ from classes, and showed you how to declare, implement, and extend interfaces in your Java programs.

conciseLambda.accept(new Long(10)); Sample Consumer interface use cases The functional Consumer interface is used extensively across the Java API, with a number of classes in the java.util.function ...

1. The Java compiler: javac The javac utility is the most important command-line interface (CLI) tool you will find in the JDK's bin directory. This is the Java compiler, and whether you use Maven, ...