在Java中创建日历对象的临时副本 [英] Creating a temporary copy of a Calendar Object in Java

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本文介绍了在Java中创建日历对象的临时副本的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我需要弄清楚如何创建一个临时日历对象(一个永久日历已经存在的副本),以便我可以操纵副本:tempCal.add(unit,value)。我需要保持原来的日历对象不变,所以我真的不想直接调用add(unit,value)。

I need to figure out how to create a temporary calendar object (a copy of a "permanent" calendar that already exists) so that I can manipulate the copy: tempCal.add (unit, value). I need to keep the original calendar object unchanged, so I really don't want to call add(unit, value) on it directly.

由于我尝试创建副本的尝试实际上没有工作,我当前丑陋的黑客是调用permanentCal.add(unit,value),显示所需的结果,然后调用permanentCal.add(unit,-value) - 看起来好像是unol。

Since none of my attempts at creating a copy actually worked, my current ugly hack is to call permanentCal.add(unit, value), display the desired results, then call permanentCal.add (unit, -value) -- which just seems, uncool.

推荐答案

util.Calendar 有一个 clone 方法,你可以使用它。

java.util.Calendar has a clone method, you could use that. All data in it is made of primitives, so you will not run into troubles.

请看看这些答案:

  • Defensive copy of Calendar
  • Quickest way to clone a GregorianCalendar?

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