Java中的进程间通信

我知道同一进程中的两个线程可以与

wait

和

notify

通信

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来自不同进程的两个线程如何相互通信？

taskmanager通过从主线程发送多个用户线程来管理任务。默认情况下始终创建主线程。用户线程1-3按顺序运行，即线程2仅在线程1完成后启动，依此类推。用户线程4-6同时启动和执行

  public class TaskManager {
    public static void main(String[] args) throws InterruptedException {
       RunnableTask task = new RunnableTask();

       //threads 1-3 are run sequentially
   Thread thread1 = new Thread(task, "Thread-1");
   Thread thread2 = new Thread(task, "Thread-2");
   Thread thread3 = new Thread(task, "Thread-3");

   thread1.start(); //invokes run() on RunnableTask
   thread1.join();  // main thread blocks (for 10 seconds)
   thread2.start(); //invokes run() on RunnableTask
   thread2.join();  // main thread blocks (for 10 seconds)
   thread3.start(); //invokes run() on RunnableTask
   thread3.join();  // main thread blocks (for 10 seconds)

   Thread thread4 = new Thread(task, "Thread-4");
   Thread thread5 = new Thread(task, "Thread-5");
   Thread thread6 = new Thread(task, "Thread-6");

       thread4.start(); //invokes run() on RunnableTask
       thread5.start(); //invokes run() on RunnableTask
       thread6.start(); //invokes run() on RunnableTask
   }
 }

注意输出的时间。线程1-3之间存在10秒的差异。但是线程4-6几乎是在同一时间启动的

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这是一个非常好的答案，但我担心op完全是在问另一个问题：他在问进程之间的通信，你可以展示单个进程中串行和并行线程的区别。

 Thread-1 at Fri Mar 02 16:59:22 EST 2012
 Thread-2 at Fri Mar 02 16:59:32 EST 2012
 Thread-3 at Fri Mar 02 16:59:42 EST 2012
 Thread-4 at Fri Mar 02 16:59:47 EST 2012
 Thread-6 at Fri Mar 02 16:59:47 EST 2012
 Thread-5 at Fri Mar 02 16:59:47 EST 2012