5. Thread -- Runnable -- Object

• Key methods of the Thread class, Runnable interface, and the Object class:

  
          Thread.start() // JVM calls the run() method of the thread
        Runnable.run()   // top-level entry into a thread
          Thread.run()
          Thread.sleep() // sleep for the specified number of milliseconds.
  
          // Calls from within a synchronized block - MANDATORY!
          Object.wait()  // wait until someone calls notify() on this object
          Object.notify() // wake up objects that waits
          Object.notifyAll()
  
  

•  Common pitfalls: 

  • calling run() instead of start()

  • calling Object's wait() notify() notifyAll() from an un-synchronized code. Note: IllegalMonitorStateException will be thrown.

  • calling Swing code directly from the main application startup thread. This must be done on Swing's event dispatch thread via SwingUtilities.invokeLater()