Learn from the technical principle of JSR 166 in the Java class library

Learn from the technical principle of JSR 166 in the Java class library introduction: The JSR 166 is a project sponsored by the Java community to provide a set of powerful and easy -to -use tools and class libraries for concurrent programming.The concurrent library launched by JSR 166 provides developers with solutions to solve common problems in multi -threaded programming.This article will explore the technical principles of JSR 166 and provide some Java code examples to illustrate its usage. 1. JSR 166 in Java Library: The JSR 166 is an abbreviation for the Java specification request, representing a group of concurrent libraries in the Java class library.These class libraries provide an efficient way to process the challenges of concurrent programming, including atomic operations, thread safety containers, etc.The class libraries in JSR 166 are widely used in various Java applications and frameworks to improve the performance and reliability of parallel processing. 2. Core principle of concurrent library: The core principle of the concurrent library in JSR 166 is to use the synchronization and collaboration between threads to ensure the security access of shared resources.Here are some important technical principles: 2.1 Atomic operation: JSR 166 provides a series of atomic operations, such as AtomicInteger and AtomicReference.These classes ensure the atomicity of the operation by using the underlying hardware characteristics and notes.This means that multiple threads can read and write these atomic variables at the same time without causing data competition or inconsistent. Example code: AtomicInteger counter = new AtomicInteger(0); counter.incrementAndGet(); 2.2 Lock and condition variables: Locks and condition variable classs in JSR 166 are the key to processing more complicated concurrency.The RENTRANTLOCK class provides a recurring mutual lock. The Countdownlatch class is used for threads waiting for other threads to complete the task, while the CyclicBarrier class is used to wait for other threads to reach a barrier point. Example code: ReentrantLock lock = new ReentrantLock(); lock.lock(); try { // Execute thread security operation } finally { lock.unlock(); } 2.3 Paper: The parallel category in JSR 166 is the key to providing thread security set operations.For example, ConcurrenThashMap is an efficient concurrent hash table. CopyonWriteArrayList is a thread security list that copys the entire list copy during modification. Example code: ConcurrentHashMap<String, Integer> map = new ConcurrentHashMap<>(); map.put("key", 1); 3. Summary: The technical principle of JSR 166 provides a powerful tool for Java developers to deal with concurrent programming challenges.By using atomic operation, locks and condition variables, and contains, developers can write safe and reliable concurrent code.The correct use of the class library in JSR 166 can improve the performance and scalability of the program, and ensure the correct execution of multi -threaded applications. It is hoped that this article will allow readers to have a deeper understanding of the technical principles of JSR 166 in the Java class library and can correctly apply these powerful concurrent libraries in their own projects.