测试类是否包含基于其名称的实例变量 [英] Test if a class contains an instance variable based on its name

问题描述

有时我需要测试哪个类声明了一些变量，是否有另一种方法如何测试，如果具体类包含一些名字的变量

Sometimes I need to test which class has declared some variable(s), is there another way how to test that, if concrete class contains variable with some name

try {
   testLocalVariable = (String) (this.getClass().getDeclaredField("testVariable").get(this));
} catch (NoSuchFieldException ex) {
} catch (SecurityException ex) {
} catch (IllegalArgumentException ex) {
} catch (IllegalAccessException ex) {
}

推荐答案

如果我理解正确，测试一个子类是否有 testVariable 字段。

If I understand correctly, you use this code in a superclass to test if a subclass has a testVariable field.

为什么不添加这样的方法？

Why don't you simply add a method like this?

 /**
  * Returns true if the object declares a testVariable field, false otherwise. Subclasses should
  * override this method
  */
protected boolean hasTestVariableField() {
    return false;
}

看起来更多OO，不破坏封装。

Seems much more OO to me, doesn't break encapsulation.

也就是说，我不知道为什么你需要这个。

That said, I've not really understood why you needed this in the first place.

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