Stopwatch用法

总计时

计时
StopWatch stopWatch = new StopWatch();
stopWatch.start();                                //计时开始
// do something
 Thread.sleep(100);
stopWatch.stop();                                  //计时结束
stopWatch.getTotalTimeMillis()                     //总用时

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分段计时

StopWatch sw = new StopWatch("test");
   sw.start("task1");
    // do something
   Thread.sleep(100);
   sw.stop();
   sw.start("task2");
   // do something
   Thread.sleep(200);
   sw.stop();
   System.out.println(sw.prettyPrint());
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