Java 中多线程程序是什么意思？

多线程程序包含两个或更多可以同时运行的部件，每个部件可以同时处理不同的任务，从而最大程度地利用可用资源，尤其是在你的计算机有多个 CPU 的情况下。
多线程让你能以一种方式编写程序，其中多个活动可以在同一个程序中同时进行。

举例

class RunnableDemo implements Runnable {
   private Thread t;
   private String threadName;
      RunnableDemo( String name) {
         threadName = name;
         System.out.println("Creating " + threadName);
      }
      public void run() {
      System.out.println("Running " + threadName);
      try {
         for(int i = 4; i > 0; i--) {
            System.out.println("Thread: " + threadName + ", " + i);
            // Let the thread sleep for a while.
            Thread.sleep(50);
         }
      } catch (InterruptedException e) {
         System.out.println("Thread " + threadName + " interrupted.");
      }
   System.out.println("Thread " + threadName + " exiting.");
   }
   public void start () {
      System.out.println("Starting " + threadName );
      if (t == null) {
         t = new Thread (this, threadName);
         t.start ();
      }
   }
}
public class TestThread {
   public static void main(String args[]) {
      RunnableDemo R1 = new RunnableDemo( "Thread-1");
      R1.start();
      RunnableDemo R2 = new RunnableDemo( "Thread-2");
      R2.start();
   }
}

输出 

Creating Thread-1
Starting Thread-1
Creating Thread-2
Starting Thread-2
Running Thread-1
Thread: Thread-1, 4
Running Thread-2
Thread: Thread-2, 4
Thread: Thread-1, 3
Thread: Thread-2, 3
Thread: Thread-1, 2
Thread: Thread-2, 2
Thread: Thread-1, 1
Thread: Thread-2, 1
Thread Thread-1 exiting.
Thread Thread-2 exiting.


更新日期： 2020-03-13

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