访谈：Java Equals [英] Interview : Java Equals

问题描述

我在采访中被问到这个问题。以下哪项更好用

I was asked this question in interview. Which of the following is better to use

 MyInput.equals("Something");   

或

"Something".equals(MyInput);

谢谢

推荐答案

我会选择

"Something".equals(MyInput);

在这种情况下，如果MyInput是 null 那么它不会抛出 NullPointerException

in this case if MyInput is null then it won't throw NullPointerException

这里我们确定等于的对象（）将要调用 NOT NULL 。

Here we are sure that the object on which equals() is going to invoke is NOT NULL.

如果您希望代码中的 NullPointerException 做出一些决定或抛出/包装它，那就先去吧。

And if you expect NullPointerException from your code to take some decision or throw/wrap it, then go for first.

没有性能影响

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