撇号在Java中是什么意思

Question

in the book i'm learning from i came across this code snippit:

while (i < len) { 
char c = s.charAt(i); 
if (c == ’(’) { 
count = count + 1; 
} else if (c == ’)’) { 
count = count - 1; 
} 
i = i + 1; 
} 

what do the apostrophes mean in (c == '(') ? also isn't there a syntax error here? it looks like (c == '(') needs another ) at the end of it.

what about here : else if (c == ')') ?

Answer 1

They surround a char in the same way that " surround a string like String s = "a string" .

In the code, it is testing if c is a ( character.

(BTW, you have ' characters in your code, and I think these should be ' characters.)

Answer 2

Single quotes indicate a character as opposed to a string which is wrapped in double quotes. So: char c = 'a'; string s = "a string";

Answer 3

Apostrophe here is used to surround one char value. With String you use "", with char you use ''