System.currentTimeMillis()这是什么方法

System.currentTimeMillis()是Java中的一个方法，用于获取当前系统时间的毫秒数。1] 它返回的是从1970年1月1日00:00:00 GMT开始至今的毫秒数。这个方法在Java中经常被用于计算时间差、生成时间戳等场景。<span class="em">1</span><span class="em">2</span>
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