Java多线程是Java编程中的重要概念,它允许程序同时执行多个任务,从而提高系统效率和资源利用率。在Java中,实现多线程有两种主要方式:通过实现`Runnable`接口和继承`Thread`类。 让我们从创建线程开始。当你有一个实现了`Runnable`接口的类时,可以通过以下方式创建并启动线程: ```java public class MyRunnable implements Runnable { @Override public void run() { // 这里编写线程要执行的代码 } } // 创建线程 Thread thread = new Thread(new MyRunnable()); // 启动线程 thread.start(); ``` 如果你选择继承`Thread`类,你需要重写`run()`方法,并创建实例来启动线程: ```java public class MyThread extends Thread { @Override public void run() { // 这里编写线程要执行的代码 } } // 创建并启动线程 MyThread thread = new MyThread(); thread.start(); ``` 线程的生命周期包括新建(New)、就绪(Runnable)、运行(Running)、阻塞(Blocked)和终止(Terminated)五个状态。`start()`方法将线程从新建状态转变为就绪状态,然后由JVM调度进入运行状态。 在多线程环境中,同步控制是非常关键的。Java提供了多种同步机制,如`synchronized`关键字、`wait()`、`notify()`和`notifyAll()`方法,以及`java.util.concurrent`包中的高级工具。`synchronized`关键字可以用于方法或代码块,确保同一时间只有一个线程访问特定资源,避免数据不一致问题。 ```java public synchronized void someMethod() { // 代码块 } ``` `wait()`, `notify()`, 和 `notifyAll()` 是与对象的监视器(monitor)相关的,通常在`synchronized`代码块或方法中使用。这些方法用于线程间通信,当一个线程调用`wait()`,它会释放对象的锁并等待,直到其他线程调用`notify()`或`notifyAll()`唤醒它。 Java的`java.util.concurrent`包提供了更高级的并发工具,如`Semaphore`(信号量)、`CyclicBarrier`(循环屏障)、`CountDownLatch`(计数门锁)和`ExecutorService`。例如,`ExecutorService`可以管理和控制线程池,有效地管理线程的生命周期。 ```java ExecutorService executor = Executors.newFixedThreadPool(5); executor.execute(new MyRunnable()); // 当不再提交任务时,关闭线程池 executor.shutdown(); ``` 此外,`Thread.join()`方法允许一个线程等待另一个线程完成其执行,而`Thread.sleep(long millis)`则让当前线程暂停指定的毫秒数。 在`day24_Thread`和`day23_Thread`的文件中,可能涵盖了线程的优先级、守护线程、中断、线程池的使用等更多主题。优先级可以使用`setPriority(int priority)`方法设置,`Thread.currentThread().isDaemon()`检查当前线程是否是守护线程,`interrupt()`方法用来中断线程,但需要注意的是,中断并不立即停止线程,而是设置一个中断标志,需要在代码中检查并处理。 Java多线程编程是一个深奥且重要的主题,涉及到并发控制、线程安全、性能优化等多个方面。通过深入学习和实践,你可以更好地理解和利用这个强大的功能。
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