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Memory visibility Volatile is a lightweight synchronization mechanism provided by Java. It also plays an important role in concurrent programming. Compared with synchronized (usually called heavyweight lock), volatile is more lightweight. Compared with the huge overhead brought by using synchronized, if volatile can be used properly and reason ...

1. Introduction to future2. Use of future class3. Introduction to completabilefuture class4. Use of completabilefuture class5. Summary 1. Introduction to futureWe were in this article before JAVA Concurrent Programming -- Introduction and use of Callable interface and FutureTask As mentioned in, Future is an asynchronous processing thread class ...

Thread collaboration Thread communication Application scenario: producer and consumer issues Suppose that only one product can be stored in the warehouse, the producer puts the produced products into the warehouse, and the consumer takes the products from the warehouse for consumptionIf there is no product in the warehouse, the producer wi ...

Advantages of thread pool The work done by the thread pool is mainly to control the number of running threads, put tasks into the queue during processing, and then start these tasks after threads are created. If the number of threads exceeds the maximum number, the exceeded threads queue up, wait for other threads to complete execution, and ...

Hello, I'm meow in the IT industry. preface A few days ago, a big man shared a code to grab the reading directory and send emails regularly in the group. I feel it's quite good. I'll share it here for you to learn. 1, Train of thought The idea is not difficult. Construct a crawler task, grab the directory on a book website, then return the ...

introduction It records the concept of multithreading, inheriting Thread, realizing Runnable, Thread sleep, Thread safety problems and solutions, multithread communication problems and Thread pool. Overview of multithreading technology Threads and processes process It refers to an application running in memory, and each process has an inde ...

Origin of CompletableFuture CompletableFuture implements the CompletionStage interface, which is an extension of the Future interface. It adds asynchronous callbacks, streaming processing, and the ability to combine multiple Futures to make Java easier to handle multitask collaborative work. Code examples (1) thenCombine public class F ...

BIO and NIO Note: the io models discussed in this paper are based on the network communication socket BIO -- blocking IO model In network communication, the client establishes a connection with the server first. Because the server does not know when the client will send data, the server has to start a thread to receive messages from the clie ...

concept Program: an ordered collection of instructions and data. It has no meaning of running. It is a static concept Process: an execution process of a program. It is a dynamic concept with its own life cycle. It is the basic unit of system resource allocation Thread: it is the basic unit of CPU scheduling and execution When a program ...

3.1. Analysis of thread shared variables Two threads do self increment and self decrement for static variables with an initial value of 0 for 5000 times respectively. Is the result 0? static int counter = 0; public static void main(String[] args) throws InterruptedException { Thread t1 = new Thread(() -> { f ...