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JUC 指的就是 java.util.concurrent 工具包的简称,里面的工具类可以很方便的实现多线程的开发。 java.util 工具包、包、分类。 业务:普通的线程代码 Thread。 Runnable 没有返回值、效率相比 Callable 相对较低! 2.1 进程 一个进程往往可以包含多个线程,至少包含一个。 Java默认有两个线程:一个 main, 一个GC。 2.2 线程 对于Java而言:Thread、Runable、Callable 是进行开启线程的。 Java是没有权限去开启线程的、操作硬件的,这是一个 native 的一个本地方法,它调用的底层是c++代码。 public synchronized void start() { /** * This method is not invoked for the main method thread or "system" * group threads created/set up by the VM.
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