Programmer Group

6,PriorityBlockingQueue An unbounded blocking queue that supports prioritization. The elements entering the queue will be sorted according to priority. public class PriorityBlockingQueue<E> extends AbstractQueue<E> implements BlockingQueue<E>, java.io.Serializable The unbounded priority blocking queue uses an array to ...

1, Atomic operation class in JUC 1. Introduction to atomic classes in JUC What is atomic operation? atomic means atom in Chinese. In chemistry, we know that atoms are the smallest unit of general matter and are inseparable in chemical reactions. Here, atomic means that an operation is non interruptible. Even when multiple threads execute to ...

scene Three commonly used auxiliary classes are provided in JUC. These auxiliary classes can well solve the frequent operation of Lock lock when there are too many threads. The three auxiliary classes are: • CountDownLatch: decrease count • CyclicBarrier: Circular barrier • Semaphore: signal light Decrease count CountDownLatch ...

Callable interface The characteristics of Callable interface are as follows (key points) In order to implement Runnable, you need to implement the run() method that does not return anything, while for Callable, you need to implement the call() method that returns the result on completion.The call() method can throw exceptions, while r ...

1. What is JUC 1.1 introduction to JUC JUC is short for Java. Util. Concurrent toolkit. This is a toolkit for processing threads. JDK 1.5 began to appear. 1.2 processes and threads Process is a running activity of a computer program on a data set. It is the basic unit for resource allocation and scheduling of the system and the basis of the ...

1. Java multithreading related concepts 1. Process It is the second execution of the program and the unique unit of the system for resource allocation and scheduling. Each process has its own memory space and system resources 2. Thread Multiple tasks can be executed in the same process. Each task can be regarded as one thread. Each p ...

1 what is JUC 1.1 introduction to JUC In Java, the thread part is a key point. The JUC mentioned in this article is also about threads. JUC is short for Java. Util. Concurrent toolkit. This is a toolkit for processing threads. JDK 1.5 began to appear. 1.2 processes and threads Process is a running activity of a computer program on a data s ...

1 false Awakening What is false awakening? Refer to a question and answer on the Internet: Question: what are the reasons for false wakeup in java multithreading? The definition found on the Internet means that the thread wakes up without calling notify() and notifyAll(), which is a false wake-up. What causes this? Answer: spurious wakeup ...

java.util.concurrent.CyclicBarrier provides a synchronization mechanism for multiple threads to wait for each other. It can be understood as an obstacle. All threads that reach the obstacle first will be in a waiting state. All threads can continue to execute until all threads reach the obstacle. For example, the synchronization mode of Cyc ...

4 thread safety of collections 4.1 set operation Demo (demonstration) NotSafeDemo: import java.util.ArrayList; import java.util.List; import java.util.UUID; /*** Collection thread safety case */ public class NotSafeDemo { /** * Multiple threads modify the collection at the same time */ public static void main(String[] args) { L ...