Get started with java.util.concurrent ... the Executor framework provides an ExecutorService interface, which extends Executor. At some point, you’ll want to obtain an executor.

public interface StartStop { void start (); void ... in the previously created testpkg.jar package file. To do that, execute java PkgInfo testpkg testpkg.A. If successful, you should see the ...

When you work with the JDK's Streams API and Lambda functions, you can use the ever-popular Java Predicate interface to help simplify the evaluation of boolean conditions. Also known as the Java 8 ...