构造函数可以中止实例化吗？ [英] Can the constructor abort instantiation?

问题描述

我想在构造函数中进行测试，以找出使用给定参数实例化对象当前是否是一个好主意。但是，我该如何终止并从构造函数向新语句返回警告？必须在每个新语句之前由调用方进行这样的测试吗？我认为构造函数将是一个理想的选择。

I want to make tests in a constructor to find out if it is currently a good idea to instantiate the object or not, with the given parameters. But how could I abort and return a warning from a constructor to the new statement? Must such tests instead be done by the caller before each "new" statement? I thought that the constructor would be a good place for it.

推荐答案

您可以使用工厂对象代替。然后可以运行检查并返回实例化的对象，或者返回null。这可能比例外更为有效。

You could use a factory object instead. This could then run your checks and return the instansiated object, or null. This would probably be more efficient than an exception.

MyObject myObject = MyObjectFactory.createMyObject();

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