精通Java多线程与并发库

java
thread
concurrency
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"Java线程与并发工具" Java线程和并发工具是其最强大但也是最具挑战性的API和语言特性。对于初学者来说，利用这些特性编写正确的多线程应用通常非常困难。《Java Threads and the Concurrency Utilities》旨在帮助所有Java开发者掌握并有效地使用这些能力。 本书分为两大部分，每部分包含四章。第一部分专注于线程API，涵盖了线程基础、Runnable接口，同步与volatile关键字，等待和通知机制，以及线程组、线程局部变量和计时器框架的额外功能。线程组允许管理一组线程，而线程局部变量则提供了在不干扰其他线程的情况下存储线程专用数据的能力。计时器框架则用于计划任务执行。 第二部分聚焦于并发工具，讲解了并发工具的基础，如Executor服务，它提供了一种更灵活的方式来管理和控制线程的执行。此外，还包括了同步器（例如Semaphore和CyclicBarrier），它们用于协调线程间的操作，以及锁框架，如ReentrantLock和ReadWriteLock，它们提供了比内置synchronized关键字更精细的控制。这部分还深入介绍了并发集合（如ConcurrentHashMap和CopyOnWriteArrayList）的高级特性，这些集合在多线程环境中提供了高效且线程安全的操作。原子变量（AtomicInteger、AtomicLong等）允许在不使用锁的情况下进行线程安全的更新，而Fork/Join框架则通过工作窃取算法优化了大型计算任务的并行处理。 学习这本书，Java开发者可以更好地理解和利用Java平台提供的并发特性，从而编写出高效、健壮的多线程应用程序。无论是对并发编程有初步了解的开发者，还是寻求提升现有技能的专业人士，都能从书中受益匪浅。通过深入理解并发原理和实践，开发者能够更好地应对现代多核处理器环境中的性能挑战，构建出能够充分利用硬件资源的高性能软件。

Java.Threads.and.the.Concurrency.Utilities.1484216997

2015-12-04 上传
This concise book empowers all Java developers to master the complexity of the Java thread APIs and concurrency utilities. This knowledge aids the Java developer in writing correct and complex performing multithreaded applications. Java's thread APIs and concurrency utilities are among its most powerful and challenging APIs and language features. Java beginners typically find it very difficult to use these features to write correct multithreaded applications. Threads and the Concurrency Utilities helps all Java developers master and use these capabilities effectively. This book is divided into two parts of four chapters each. Part 1 focuses on the Thread APIs and Part 2 focuses on the concurrency utilities. In Part 1, you learn about Thread API basics and runnables, synchronization and volatility, waiting and notification, and the additional capabilities of thread groups, thread local variables, and the Timer Framework. In Part 2, you learn about concurrency utilities basics and executors, synchronizers, the Locking Framework, and the additional capabilities of concurrent collections, atomic variables, and the Fork/Join Framework. Each chapter ends with select exercises designed to challenge your grasp of the chapter's content. An appendix provides the answers to these exercises. A second appendix explores how threads are used by various standard class library APIs. Specifically, you learn about threads in the contexts of Swing, JavaFX, and Java 8's Streams API. What you’ll learn How to do thread runnables, synchronization, volatility, waiting and notification, thread groups, thread local variables, and the Timer Framework How to create multithreaded applications that work correctly. What are concurrency utilities basics and executors What are synchronizers, the Locking Framework, concurrent collections, atomic variables, and the Fork/Join Framework and how to use them How to leverage the concurrency utilities to write more complex multithreaded applications and achieve greater performance How to apply thread usage in Swing, JavaFX, and Java 8 Streams API contexts Who this book is for The primary audience is Java beginners and the secondary audience is more advanced Java developers who have worked with the Thread APIs and the Concurrency Utilities. Table of Contents Part I: Thread APIs Chapter 1: Threads and Runnables Chapter 2: Synchronization Chapter 3: Waiting and Notification Chapter 4: Additional Thread Capabilities Part II: Concurrency Utilities Chapter 5: Concurrency Utilities and Executors Chapter 6: Synchronizers Chapter 7: The Locking Framework Chapter 8: Additional Concurrency Utilities Part III: Appendices Appendix A: Answers to Exercises Appendix B: Threading in Swing

Java Threads and the Concurrency Utilities 无水印pdf

2017-09-30 上传
Java Threads and the Concurrency Utilities 英文无水印pdf pdf所有页面使用FoxitReader和PDF-XChangeViewer测试都可以打开 本资源转载自网络，如有侵权，请联系上传者或csdn删除 本资源转载自网络，如有侵权，请联系上传者或csdn删除

Create threading events for communication and synchronisation between the learner and agent threads

2023-05-30 上传
In Python, we can use the threading module to create threads and synchronization primitives like events. Here's an example of how you can use events to communicate and synchronize between two threads:...

Write a multithreaded program that calculates various statistical values for a list of numbers: • Average • Minimum • Maximum • Median • Standard deviation This program will be passed a series of numbers on the command line and will then create three separate worker threads first. One thread will determine the average of the numbers, the second will determine the maximum value, and the third will determine the minimum value. For example, suppose your program is passed the integers 90 81 78 95 79 72 85 The program will report The average value is 82 The minimum value is 72 The maximum value is 95 The variables representing the average, minimum, and maximum values will be stored globally. The worker threads will set these values, and the parent thread will output the values once the workers have exited. After that, add two more global variables and two more threads that will determine the median and the standard deviation, respectively.

2023-05-26 上传
The `main()` function parses the command line arguments into a list of numbers, creates the worker threads, starts the threads, and then waits for them to finish. Once all the threads have finished, ...

下面是一道java编程题In the well-known story of "The tortoise and the hare", the hare was too confident and took a break in the middle of the competition, which led to the tortoise winning the competition. A multi-threaded program is required to simulate the race between the tortoise and the hare. The speed of the tortoise is 1 meter per 1500 milliseconds, and the speed of the hare is 5 meters per 500 milliseconds. When the hare reached the 700th meter, it chose to rest for 10,000 milliseconds. As a result, the tortoise wins the race. The output result of the program running is shown in the figure.

2023-06-11 上传
Sure, here is a possible implementation of the program in Java: ```java ...Note that the output result may vary slightly between runs due to the randomness in the timing of the threads.

Write a program that launches 1,000 threads. Each thread adds 1 to an integer variable sum which initialized as 0. Implement the addition program with and without synchronization to observe different results. (1)Define the main class sum to create a fixed thread pool with 1,000 threads; (2)Define the task class SumTaskWithoutSyn which implements addition without any synchronization; (3)Define the task class SumTaskWithSynMet to implement synchronized method; (4)Define the task class SumTaskWithSynStat to implement synchronized statement block; (5)Define the task class SumTaskWithLock to implement synchronization with lock.

2023-06-10 上传
The `Sum` class creates a fixed thread pool with 1,000 threads and submits tasks to the executor. It then waits for all threads to finish and prints the final sum. Here is the code for the `...

List the three common ways of mapping user threads to kernel threads.

2023-04-01 上传
The user-level thread management is handled entirely in user space, and the kernel has no knowledge of the user-level threads. This approach is simple to implement, but it suffers from poor ...

The Sleeping Teaching Assistant A university computer science department has a teaching assistant (TA) who helps undergraduate students with their programming assignments during regular office hours. The TA’s office is rather small and has room for only one desk with a chair and computer. There are three chairs in the hallway outside the office where students can sit and wait if the TA is currently helping another student. When there are no students who need help during office hours, the TA sits at the desk and takes a nap. If a student arrives during office hours and finds the TA sleeping, the student must awaken the TA to ask for help. If a student arrives and finds the TA currently helping another student, the student sits on one of the chairs in the hallway and waits. If no chairs are available, the student will come back at a later time. Using POSIX threads, mutex locks, and/or semaphores, implement a solution that coordinates the activities of the TA and the students. Details for this assignment are provided below. Using Pthreads, begin by creating N students. Each will run as a separate thread. The TA will run as a separate thread as well. Student threads will alternate between programming for a period of time and seeking help from the TA. If the TA is available, they will obtain help. Otherwise, they will either sit in a chair in the hallway or, if no chairs are available, will resume programming and will seek help at a later time. If a student arrives and notices that the TA is sleeping, the student must notify the TA using a semaphore. When the TA finishes helping a student, the TA must check to see if there are students waiting for help in the hallway. If so, the TA must help each of these students in turn. If no students are present, the TA may return to napping. Perhaps the best option for simulating students programming—as well as the TA providing help to a student—is to have the appropriate threads sleep for a random period of time using the sleep() API:

2023-06-04 上传
This is a programming assignment that requires the use of POSIX threads, mutex locks, and/or semaphores to coordinate the activities of the TA and the students. Here is one possible solution: 1. ...

public Executor

2023-03-31 上传
An Executor is an interface in Java's Concurrency API that provides a framework for executing tasks in a separate thread or a pool of threads. It defines a single method "execute" that takes a ...

An Executor that provides methods to manage termination and methods that can produce a Future for tracking progress of one or more asynchronous tasks. An ExecutorService can be shut down, which will cause it to reject new tasks. Two different methods are provided for shutting down an ExecutorService. The shutdown method will allow previously submitted tasks to execute before terminating, while the shutdownNow method prevents waiting tasks from starting and attempts to stop currently executing tasks. Upon termination, an executor has no tasks actively executing, no tasks awaiting execution, and no new tasks can be submitted. An unused ExecutorService should be shut down to allow reclamation of its resources. Method submit extends base method Executor.execute(Runnable) by creating and returning a Future that can be used to cancel execution and/or wait for completion. Methods invokeAny and invokeAll perform the most commonly useful forms of bulk execution, executing a collection of tasks and then waiting for at least one, or all, to complete. (Class ExecutorCompletionService can be used to write customized variants of these methods.) The Executors class provides factory methods for the executor services provided in this package. Usage Examples Here is a sketch of a network service in which threads in a thread pool service incoming requests. It uses the preconfigured Executors.newFixedThreadPool factory method:

2023-07-14 上传
An ExecutorService is an Executor that provides additional methods for managing termination and tracking the progress of asynchronous tasks. It extends the base Executor interface and adds ...
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