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Java常用类库(System、Arrays、定时调度、Base64加密解密)

1.System类System类常用方法:void exit(int status)终止当前正在运行的Java虚拟机。long currentTimeMillis()返回当前时间的毫秒数，通常用于计时或性能分析。void arraycopy(Object src, int srcPos, Objec...

Java常用类库--定时调度（Timer、TimerTask）

定时调度：每当一到时间，程序会自动执行，称为定时调度。如果要使用定时调度，则必须保证程序始终运行着才可以，也就是说相当于定时调度是在程序之外又启动了一个新的线程。Timer和TimerTask两个类完成定时调度。如果现在一个Timer类要想调度程序的话，则需要使用TimerTask的子类。就依...

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更新时间 2023-08-28 11:04:35

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