当clear（）方法调用抛出UnsupportedOperationException时如何清除地图的内容？ [英] How to clear out the contents of a map when clear() method call throws UnsupportedOperationException?

问题描述

如果我在 clear（）方法调用时收到 UnsupportedOperationException 地图实例？

How can I empty a map contents if I keep getting an UnsupportedOperationException when I call clear() method on the map instance ?

推荐答案

你不应该。合作对象及其方法的合同中存在错误。您期望可修改的地图，但获得不可修改的视图。您应该重新定义合同和/或相应采用任何实现。如果你不控制一个，谁传递你的地图，那么可能有一个原因，它传递一个不可修改的视图。

You shouldn't. There is something wrong in the contracts of the collaborating objects and their methods. You expect a modifiable map, but get an unmodifiable view. You should redefine the contracts and/or adopt any of the implementations accordingly. If you are not in control of the one, who is passing you that map, then there is probably a reason for it passing you an unmodifiable view.

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