线程的Java示例ID

public class Main extends Object implements Runnable {

   private ThreadID var;

   public Main(ThreadID v) {

      this.var = v;

   }

   public void run() {

      try {

         print("var getThreadID =" + var.getThreadID());

         Thread.sleep(2000);

         print("var getThreadID =" + var.getThreadID());

      } catch (InterruptedException x) {}

   }

   private static void print(String msg) {

      String name = Thread.currentThread().getName();

      System.out.println(name + ": " + msg);

   }

   public static void main(String[] args) {

      ThreadID tid = new ThreadID();

      Main shared = new Main(tid);

      try {

         Thread threadA = new Thread(shared, "threadA");

         threadA.start();

         Thread.sleep(500);



         Thread threadB = new Thread(shared, "threadB");

         threadB.start();

         Thread.sleep(500);



         Thread threadC = new Thread(shared, "threadC");

         threadC.start();

      } catch (InterruptedException x) {}

   }

}

class ThreadID extends ThreadLocal {

   private int nextID;

   public ThreadID() {

      nextID = 10001;

   }

   private synchronized Integer getNewID() {

      Integer id = new Integer(nextID);

      nextID++;

      return id;

   }

   protected Object initialValue() {

      print("in initialValue()");

      return getNewID();

   }

   public int getThreadID() {

      Integer id = (Integer) get();

      return id.intValue();

   }

   private static void print(String msg) {

      String name = Thread.currentThread().getName();

      System.out.println(name + ": " + msg);

   }

}