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JUC (concurrent programming) 1. What is JUC java.util.concurrent package is a tool class used in concurrent programming. It has the following three packages: java.util Toolkit Business: common Thread code Thread Runnable has no return value and its efficiency is relatively lower than that of Callable!) ( 2. Threads and processes Th ...

catalogue 1, What is ForkJoin 2, ForkJoin is easy to use 3, ForkJoin principle Core API Job theft algorithm ForKJoin principle 1, What is ForkJoin "Divide and conquer" is an idea. The so-called "divide and conquer" is to divide a complex algorithm problem into several smaller parts according to a certain "dec ...

Thread six states New: a new thread object has been created, but the start() method has not been called yet.Runnable: the two states of ready and running in Java threads are generally called "running". After the thread object is created, other threads (such as main thread) call the start() method of the object. The thread in ...

CyclicBarrier 1. Introduction Loop fence is used for thread cooperation and waiting for threads to meet a certain count. When constructing, set the count number. When each thread executes to a time when synchronization is required, call the await() method to wait. When the number of waiting threads meets the count number, continue to exec ...

catalogue 1. What is AQS 2. Use of LockSupport 3. Analyze AQS source code with ReentrantLock Unfair locking operation Release lock operation 1. What is AQS AQS(AbstractQueuedSynchronizer) is a framework used to build locks and synchronizers. Using AQS can easily and efficiently construct a large number of synchronizers widely used, su ...

Concurrent programming 1. Processes and threads Process: an execution process of a program. It is the basic unit for the system to run the program. A thread is similar to a process, but a thread is a smaller execution unit than a process. A process can produce multiple threads during its execution. Different from the process, multiple th ...

JUC notes JUC concurrent programming (I) - multithreading review, Synchronized and Lock locks, Condition thread communication, eight Lock problemJUC concurrent programming (II) - set insecurity and solutions under concurrency, read-write lock, blocking queue 10. Callable review Details: Multithreaded pickup The difference between Cal ...

ThreadLocalRandom class parsingprefaceThreadLocalRandom class is a new Random number generator added by JDK7 under JUC package. It mainly solves the shortage of Random class under multithreading.This article explains the principle of the random thread class and why it needs to be implemented.Random class and its limitationsFirst, let's look at ...

1, Visibility Visibility: when one thread modifies a shared variable, the other thread immediately gets the latest modified value. Case demonstration: one thread loops through flag and while according to the boolean flag, and another thread changes the value of the flag variable A thread does not stop the loop. /** * Objective: to dem ...

Synchronous and asynchronous: You need to wait for the result to return before you can continue running, which is synchronizationIt is asynchronous to continue running without waiting for the result to return start() and run() difference: Call start() to start a new thread. Stealing the run() method is a call to an ordinary method and wil ...