The characteristics of java parallel mechanism are

Java parallel mechanism is characterized by multithreading.

Java provides multithreading mechanism, which can execute multiple threads at the same time. Each thread executes independently and can execute in parallel, which improves the execution efficiency of the program. The parallel mechanism of Java uses thread pool to manage the creation and destruction of threads, which can reuse threads and avoid the overhead of frequent creation and destruction of threads.

Java provides some concurrency containers, such as ConcurrentHashMap and ConcurrentLinkedQueue, which are used to operate data structures safely in a multithreaded environment and provide efficient concurrent access. Java provides synchronization mechanisms such as synchronized keywords and Lock interface, which are used to control the synchronous access to resources between multiple threads and avoid data inconsistency and competition caused by multi-thread access.

Other characteristics of Java parallel mechanism

Java provides some concurrent tool classes, such as CountDownLatch, CyclicBarrier and Semaphore, which are used to realize the synchronization and coordination between threads in a multithreaded environment. Java provides some atomic operation classes, such as AtomicInteger and AtomicLong, which are used to realize thread-safe atomic operation in multithreading environment, thus avoiding the problem of race conditions among multithreading.

Java provides some parallel algorithm libraries, such as Fork/Join framework, parallel stream, etc., to realize efficient parallel computing and improve the execution speed of programs. In a word, Java's parallel mechanism provides multithreading support and a series of concurrency tools, synchronization mechanisms and concurrency containers, which can help developers realize efficient concurrent programs and improve the execution efficiency of programs.