Concurrency in java : Concurrency refers to the parallel processing. This package contains a set of classes that makes it easier to develop concurrent (multithreaded) applications in Java. The Java platform is designed from the ground up to support concurrent programming, with basic concurrency support in the Java programming language and the Java class libraries. Java Concurrency API defines three executor interfaces that cover everything that is needed for creating and managing threads: Executor: launch a task specified by a Runnable object. This tutorial will discuss components of java.util.concurrent package like Java Semaphore, Executor Framework, ExecutorService to implement Concurrency in Java: From our previous Java tutorials, we know that the Java platform supports concurrent programming from the ground up. The java.util.concurrent contains way too many features to discuss in a single write-up. Concurrent Programming in Java, 2nd Edition surveys a wide field of research in parallelism and concurrency and shows how to do more with multithreading in Java with dozens of patterns and design tips. The java.util.concurrent package provides tools for creating concurrent applications. For this reason, the Concurrency API was introduced back in 2004 with the release of Java 5 and has been enhanced with every new Java release. Main Components . )CompletionStage represents a stage or step in a possibly asynchronous computation. In this article, we will do an overview of the whole package. Java runs on a variety of platforms, such as Windows, Mac OS, and the various versions of UNIX. Since version 5.0, the Java platform has also included high-level concurrency APIs to ease the complex semantics of working with and understanding Threading behaviors. Prerequisites: ConcurrentMap The ConcurrentHashMap class is introduced in JDK 1.5 belongs to java.util.concurrent package, which implements ConcurrentMap as well as Serializable interface also.ConcurrentHashMap is an enhancement of HashMap as we know that while dealing with Threads in our application HashMap is not a good choice because performance-wise HashMap is not … The Java Concurrency Framework comprises of a collection of thread-safe and robust services that enable you to develop applications that can leverage the advantages of concurrent programming. Java 8 adds the CompletableFuture class, which implements the new CompletionStage interface and extends Future. It is the ability to execute more than one programs or more than one parts of the program in parallel without affecting the final outcome. 2. (All concurrency classes and interfaces discussed in this section are in the java.util.concurrent package. 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