package com.dx.testparallel;import java.util.concurrent.Executors;import java.util.concurrent.ScheduledExecutorService;import java.util.concurrent.TimeUnit;;public class TestTimer {    public static void main(String[] args){        ScheduledExecutorService scheduledExecutorService=Executors.newScheduledThreadPool(1);        //Creates and executes a periodic action that becomes enabled         //first after the given initial delay, and subsequently with the         //given period; that is executions will commence after         //initialDelay then initialDelay+period, then initialDelay + 2 *         //period, and so on. If any execution of the task encounters an         //exception, subsequent executions are suppressed.         //Otherwise, the task will only terminate via cancellation or         //termination of the executor. If any execution of this task         //takes longer than its period, then subsequent executions may         //start late, but will not concurrently execute.        scheduledExecutorService.scheduleAtFixedRate(new TheTask(), 0,1000, TimeUnit.MILLISECONDS);    }}

package com.dx.testparallel;import java.sql.Timestamp;import java.text.SimpleDateFormat;import java.util.Date;import java.util.UUID;import javax.lang.model.element.VariableElement;public class TheTask implements Runnable{        @Override    public void run() {                  Timestamp ts = new Timestamp(System.currentTimeMillis());            UUID uuid = UUID.randomUUID();             System.out.println("task"+uuid+" start:"+ts.toString());        //          long num=0;//          for(int a=0;a<100000;a++){//              for(int i=0;i<1000000;i++){//                  for(int j=0;j<1000000;j++){//                      num= a*i*j;//                  }//              }//          }          try {            Thread.sleep(2000);        } catch (InterruptedException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }                    ts = new Timestamp(System.currentTimeMillis());            System.out.println("task"+uuid+" end:"+ts.toString());    }}

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