Find single line comments in byte array

Question

Is it possible to find instances of // in a line read from a file into a byte array and then "snip" from // to the end of the line out? I'm trying

FileInputStream fis = new FileInputStream(file);
byte[] buffer = new byte[8 * 1024];
int read;

while ((read = fis.read(buffer)) != -1) 
{
    for (int i = 0; i < read; i++) 
    {
        if (buffer[i] == '//')
        {
            buffer = buffer[0:i];
        }
    }
}

but I'm getting Invalid character constant at if (buffer[i] == '//') on the '//' part. Am I doing something wrong, or is this just not possible?

I'm sure in single position of buffer will not be '//' because it's impossible. — Matt, Dec 22 '15 at 17:06
Why are you reading strings as bytes in the first place? Use an appropriate reader that will read lines and use `indexOf()`. It looks to me like you're trying to write C code using Java — user1231232141214124, Dec 22 '15 at 17:16

score 1 · Answer 1 · answered Dec 22 '15 at 17:20

1

Old-school solution

for (int i = 0; i < read-1; i++) 
    {
        (if (buffer[i] == '/') && (buffer[i+1]== '/'))
        {
            buffer = buffer[0:i];
        }
    }

answered Dec 22 '15 at 17:20

guillaume girod-vitouchkina

3,061
1
10
26

qwertz · Answer 2 · 2015-12-22T17:38:44.277

0

' and ' denote one character. Since // are two characters this does not work. One has to differentiate between a character and a string. Thus you have to individually check both positions in the byte array to confirm there are two successive /s.

edited Dec 22 '15 at 17:38

answered Dec 22 '15 at 17:21

qwertz

14,614
10
34
46

Damn, there are some funny downvoters around. Can you please explain, so I can improve the answer? – qwertz Dec 22 '15 at 17:28

Find single line comments in byte array

2 Answers2

Linked