????????????裺???Runnable???

?????????????е?run??????

???????Thread?????????????????Runnable???????????????????????Thread??????????

????Thread????????start????????????

public class RunnableTest implements Runnable {

 private int num = 100;

 @Override
 public void run() {
  while (true) {
   if (num > 0) {
    try {
     Thread.sleep(100);
    } catch (InterruptedException e) {
     e.printStackTrace();
    }
    System.out.println(Thread.currentThread().getName() + "----->"
      + num--);
   } else {
    break;
   }
  }
 }

 public static void main(String args[]) {
  RunnableTest rt = new RunnableTest();
  Thread t1 = new Thread(rt?? "?????1");
  Thread t2 = new Thread(rt?? "?????2");
  Thread t3 = new Thread(rt?? "?????3");
  t1.start();
  t2.start();
  t3.start();
 }

????2.??????????????

????Runnable??????????Thread???????

????1.???????????????????????????????????????????CPU?????????????????????Ч????????????????????????????

????2.???????????java??????????????????????????????????????????????????????У??????????????????????????????????Runnable????????

????3.????????????????????????????????????????????????????