Count the number of lines in a Java String

Question

Need some compact code for counting the number of lines in a string in Java. The string is to be separated by \r or \n. Each instance of those newline characters will be considered as a separate line. For example -

"Hello\nWorld\nThis\nIs\t" 

should return 4. The prototype is

private static int countLines(String str) {...} 

Can someone provide a compact set of statements? I have a solution at here but it is too long, I think. Thank you.

Answer 1

private static int countLines(String str){    String[] lines = str.split("\r\n|\r|\n");    return  lines.length; } 

Answer 2

How about this:

String yourInput = "..."; Matcher m = Pattern.compile("\r\n|\r|\n").matcher(yourInput); int lines = 1; while (m.find()) {     lines ++; } 

This way you don't need to split the String into a lot of new String objects, which will be cleaned up by the garbage collector later. (This happens when using String.split(String);).