计时操作

1、Stopwatch watch = Stopwatch.createStarted();

watch.stop();

"耗时："+watch.elapsed().toMillis()

2、

Instant beginTime = Instant.now();

Instant endTime = Instant.now();

耗时：Duration.between(beginTime, endTime).toMillis() + "ms"

3、long start = System.currentTimeMillis();
long end = System.currentTimeMillis();

耗时： (end - start) ms