忽略Java中以“＃”开头的文件中的行

Question

I'm trying to parse a text file in Java. In this text file, comments(things I don't want to parse) are denoted by a "#" sign at the beginning of the line.

I thought this would be really simple, something like:

String line ="#hi everyone";

if(!line.startsWith("#")){
//do stuff
}

But it doesn't work. I've also tried using !line.substring(0,1).equals("#"), .contains, and messed around with chars and more complicated regex stuff but with no luck.

I've watched it in the debugger and checked to make sure that the value for "line" is actually the correct value. It is correct, the line starts with #, and yet it somehow is passing the test in my if statement.

Am I missing something really basic here?

Answer 1

Have you tried

String line ="#hi everyone";

if(!line.charAt(0) == '#'){
//do stuff
}

Answer 2

try either of the following:

regex: "^[ \\t]*#.*"

or

line.trim().startsWith("#")