Java concurrency, synchronous lock performance testing

The test is mainly from the running time difference, the larger the amount of data, the more obvious the time difference, examples are as follows:

1 Package com.xt.thinks21_2;2 3 /**4 * Synchronous lock Performance Test5  * 6 * @author Administrator7  *8  */9  Public classSynchronizedtimetest {Ten      Public volatile intinc =0; One  A      Public voidIncrease () { -Inc++; -     } the  -      Public Static voidMain (string[] args) { -Final Synchronizedtimetest test =Newsynchronizedtimetest (); -          for(inti =0; I <Ten; i++) { +             NewThread () { -                  Public voidrun () { +                      for(intj =0; J <10000; J + +) A test.increase (); at                 }; - }.start (); -         } -Long time1 =System.currenttimemillis (); -          while(Thread.activecount () >1) { -             //ensure that the previous threads are finished executing inThread.yield(); -         } toLong time2 =System.currenttimemillis (); +System. out. println ("time1:"+ time1 +"time2:"+time2); -Long Timediff = time2-time1; theSystem. out. println ("Time :"+ Timediff +" -"+test.inc); *     } $}

Above is the method without synchronized running result:

time1:1429805281187 time2:1429805281187
time:0-->75809

method to add the synchronized run result:

time1:1429805416628 time2:1429805416645
time:17-->100000

Java concurrency, synchronous lock performance testing