java - Error in using ThreadPoolExecutor -

i have following job want threadpoolexecutor run.i want print start time , end time of each job. start times printing end times not printing. dont know doing wrong please help!

import java.util.concurrent.timeunit;    public class job  implements runnable { private long starttime,endtime,delay; int id;  public job(long delay) {     this.delay=delay;    } public int getid() {     return id; } public void setid(int id) {     this.id = id; }  public long getstarttime() {     return starttime; } public void setstarttime(long starttime) {     this.starttime = starttime; } public long getendtime() {     return endtime; } public void setendtime(long endtime) {     this.endtime = endtime; }        @override public void run() {       setstarttime(system.nanotime());         try{            timeunit.milliseconds.sleep(delay);            }catch(interruptedexception e){             }     setendtime(system.nanotime());      }       } 

following main class

import java.util.vector; import java.util.concurrent.executors; import java.util.concurrent.threadpoolexecutor; import java.util.concurrent.timeunit; public class oracleexecutorservice {     threadpoolexecutor executor; //= (threadpoolexecutor) executors.newcachedthreadpool();     vector vector=new vector();      public oracleexecutorservice() {         super();         this.executor= (threadpoolexecutor) executors.newcachedthreadpool();         runjobs();         displayresults();         this.executor.shutdown();     }      private void displayresults() {         // todo auto-generated method stub         for(int i=0;i<vector.size();i++){             job job=(job)vector.get(i);              system.out.println("job id="+job.getid()+" start time="+job.getstarttime());             system.out.println("job id="+job.getid()+" end time="+job.getendtime());                     }     }      private void runjobs() {         // todo auto-generated method stub         int count;         (int = 0; <= 5; i++)          {             job job=new job(100); //100milliseconds             count=i+1;             job.setid(count);             vector.add(job);             executor.execute(job);         }     }      /**      * @param args      */     public static void main(string[] args) {         // todo auto-generated method stub         new oracleexecutorservice();       }  } 

output follows

job id=1 start time=935938224433767

job id=1 end time=0

job id=2 start time=935938224477583

job id=2 end time=0

job id=3 start time=935938224648899

job id=3 end time=0

job id=4 start time=935938224696268

job id=4 end time=0

job id=5 start time=935938224749952

job id=5 end time=0

job id=6 start time=935938224796532

job id=6 end time=0

it no error.

basically before endtime set, or before job finishes, call displayresults.

     runjobs();     thread.sleep(200);// wait job finish - make end time set , display     displayresults();  

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try this. know happens.

   setendtime(system.nanotime());    system.out.println("i done:" + system.nanotime());