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. Java 5 added a new Java package to the Java platform, the java.util.concurrent package. 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. 2. )CompletionStage represents a stage or step in a possibly asynchronous computation. (All concurrency classes and interfaces discussed in this section are in the java.util.concurrent package. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. This package contains a set of classes that makes it easier to develop concurrent (multithreaded) applications in Java. 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. 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 … Java 8 adds the CompletableFuture class, which implements the new CompletionStage interface and extends Future. 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. The java.util.concurrent contains way too many features to discuss in a single write-up. A Computer Science portal for geeks. Main Components . This tutorial gives a complete understanding of Java. In this article, we will do an overview of the whole package. Concurrency in java : Concurrency refers to the parallel processing. 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. 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. Written for the advanced Java developer, this book offers a comprehensive tour of leading-edge thinking about parallel coding processes. The java.util.concurrent package provides tools for creating concurrent applications. Java runs on a variety of platforms, such as Windows, Mac OS, and the various versions of UNIX. 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