java concurrency book

Why concurrency is requiredConcurrency is actually a decoupling strategy that helps us to separate what we do (the target) and when we do it (timing). Doing so can significantly improve the throughput of the application (getting more CPU scheduling time) and structure (multiple parts of the program are working together). As anyone who has ever done Java Web Development knows, the servlet program in the

between overloading and overridingOverloading and rewriting are good differences, see if the interface is consistent. "The case" is very good interpretation of this point. Since the overloads themselves are inside the parent class, there is no doubt that all outputs are 3.32 static methods cannot be rewritten-is this definition correct in the "hsy75 case" book???2.1 See "Case 0" The parent class is a static subclass is public, or the parent class is

, List page and detail page anti-brush, seconds kill operation Anti-brush, verification code anti-brush. This chapter introduces some common schemes to prevent spiders or second-kill artifacts.8th Server Optimization (TOMCAT/NGNIX/LVS) tomcat optimization, Ngnix optimization, LVS four-layer load balancing, lvs+keepalived high-availability optimizationThe 9th chapter of the course summary and the heavy difficulties reviewA review of the curriculum summary and difficulties : Baidu Network disk dow

inherit the class to create our own timed task and use the timer to schedule its execution.What is the difference between a synchronous collection in 14,java and a concurrent collection?Both synchronous and concurrent collections provide the appropriate thread-safe collection for multithreading and concurrency, although the concurrency collection is more extensi

The concept of first contact deadlock is the "Philosopher's meal" as described in the principle of operating system in a university course. In the operating system, a deadlock problem may occur because each process shares system resources. In the same Java multithreaded environment, there are also deadlock problems caused by resource sharing. When a set of Java threads Deadlock, it is possible that the prog

[Java concurrent programming] 9: deadlock (including code), java concurrency A deadlock may occur when the thread needs to hold multiple locks at the same time. Consider the following situations: Thread A currently holds the lock1 lock and thread B currently holds the lock2 lock. Next, when thread A still holds lock1, it tries to get lock2 because thread B is hol

);V.stopit ();Thread.Sleep (2000);SYSTEM.OUT.PRINTLN ("Finish main");System.out.println (V.getstop ());}Iv. Rules of Happen-beforeProcedural Order Principle: the serialization of semantics within a threadVolatile rules: The write of volatile variables, which occurs first in the read, which guarantees the visibility of volatile variablesLock rule: Unlocking (unlock) must occur before the subsequent locking (lock)Transitivity: A precedes b,b before C, then a must precede CThe start () method of th

1. Java.util.concurrent-java Concurrency ToolkitJava 5 Adds a new package to the Java platform, java.util.concurrent package. This package contains a series of classes that make Java concurrent programming simpler and easier. Before this package is added, you need to do it yourself to implement your own related tool cl

Java concurrency series [6] ---- Semaphore source code analysis, java ---- semaphore Semaphore is a common class in the JUC package. It is an application in the AQS sharing mode and allows multiple threads to operate on shared resources at the same time, in addition, it can effectively control the number of concurrent jobs and use it to control traffic. Semaphore

) {e.printstacktrace (); } System.out.println ("Test ends ..."); } } } classMyThreadextendsThread { Public voidrun () {Sync sync=NewSync (); Sync.test (); } } Public classMain { Public Static voidMain (string[] args) { for(inti = 0; I ) {thread thread=NewMyThread (); Thread.Start (); } } } Operation Result:Test start:Test end:Test start:Test end:Test start:Test end:The above code uses synchronized (Sync.class) to achieve the effect of global locking.Finally, th

AQS 14.6.1 reentrantlock 14.6.2 Sem Aphore and Countdownlatch 14.6.3 futuretask 14.6.4 reentrantreadwritelockthe 15th chapter atom variable and non-blocking synchronization mechanism15.1 Disadvantages of the lock 15.2 hardware support for concurrency 15.2.1 compare and exchange 15.2.2 non-blocking counters 15.2.3 JVM support for CAS 15.3 atomic variable class 15.3.1 atomic variable is a "better volatile" 1 5.3.2 Performance Comparison: Lock and Atom

and concurrency issues are among the questions that interviewers prefer to ask in a Java technology interview. Here, the most important questions are listed from the interview point of view, but you should still have a solid grasp of the basics of Java multithreading to match the problems you encounter later.1. Java Mu

() {Clear Business Full.notifyall ();}Think of more targeted object-oriented programming. Similar issues with databases: Dirty reads: The first thing reads the data that the second thing is updating, and if the UPDATE statement is not yet complete, the first thing reads only the data in a process, not the actual result. Oracle's Things by default: Read Committed (commit read), the problem does not occurExclusive Lock: Gets an exclusive lock when the data is changed.Shared Lock: The query acqui

Learning Resources E -book articles From the foundation to the project actual combat massive Video tutorial Resources chapter I. Electronic Book Resources Daquan 1. Java Basics2. Java EE3. Front Page related4. Database related5. Java Virtual Machine Re

The following is transferred from http://ifeve.com/anatomy-of-a-synchronizer/:Although many synchronizers (such as locks, semaphores, blocking queues, etc.) function differently, their internal design is very different. In other words, the underlying parts of their internals are identical (or similar). Understanding these basic components can help us greatly when designing Synchronizer. This is what this article is going to elaborate.Note: The content of this article is the Bjørn of the Universi

! bells >> ");}} /** * Termination * @author Lenovo * */class Terminate implements runnable{@Overridepublic void Run () {System.out.println ("Terminate Scheduler.shutdown ();//must start a separate task to does this job must start a separate task to do the job//since the scheduler has been ShUT down self-scheduler has closed new Thread () {public void run () {Datapoint d:data) {System.out.println ("Datapoint:" +d);}};}. Start ();}} /** * can hold and display individual data segments * @author Le

state, and the callable need to ensure its visibility, but only one is decorated with volatile, and the order of writing guarantees the visibility of the variable that is not modified by the Volatile.The book read: "in addition to volatile, synchronized and final can also achieve visibility." Synchronized visibility: before leaving the synchronized code block, you must first synchronize the variables into main memory. Final Visibility: The final deco

is the Key-value type database, is directly in the memory carries on the access data, therefore has the very high performance. The use of Redis can reduce the pressure on the MySQL server and reduce the number of communications with the database server. The bottleneck of the second kill is the speed of communication with the database server (MySQL itself's primary key query is very fast) 2.2 Configure Redis client in Pom.xml Jedis Redis has many clients, our project is written in the

Java Multithreading and Concurrency basics interview questions and AnswersOriginal link: http://ifeve.com/java-multi-threading-concurrency-interview-questions-with-answers/Multithreading and concurrency issues are among the questions that interviewers prefer to ask in a

Before you continue to understand the Java memory model, it is a good idea to understand the memory representation of Java objects first. In the Internet search for the Java object Memory representation, said is not enough system and in place. Before looking at the "hotspot Combat" a book, how the JVM represents the ob