Java - 两个字符，如何识别哪个是“？”

Question

I have two char ' ' and '?'. How to recognize them from java? How to check which one is natural '?' and which one is not?

Answer 1

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Character Encoding:

Short: In computers, each character is represented by a set of binary digits. The digits for representing a character are determined by the character encoding that you have chosen to use. For enrichment:

https://en.wikipedia.org/wiki/Character_encoding

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Solution:

To the two characters you've introduced here, there are completely different numeric values. I don't know what character encoding you are using (I don't need to know), so try to print their numeric value by converting them to an integer and look at the result.

As you can see, their values are different, and incidentally, also their appearance. Therefore, it follows that all that needs to be done is to compare these two characters (Which is actually to compare both numeric values).

if ('�' == '?')
    System.out.println("Always False!");

Can you see the problem here? Yes, this condition will be always FALSE . As a result, the instruction inside the if statement scope is considered dead code .