System.currentTimeMillis的时间差

System.currentTimeMillis()用于返回当前的计算机时间，以毫秒为单位。可以使用它来计算某个任务的耗时。例如，通过在任务开始时记录当前时间，再在任务结束时记录当前时间，相减得到时间差，即可得到任务的执行时间。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
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