Best implementation for an isNumber(string) method

Question

In my limited experience, I\'ve been on several projects that have had some sort of string utility class with methods to determine if a given string is a number. The idea h

Answer 1

I needed to refactor code like yours to get rid of NumberFormatException. The refactored Code:

public static Integer parseInteger(final String str) {
    if (str == null || str.isEmpty()) {
        return null;
    }
    final Scanner sc = new Scanner(str);
    return Integer.valueOf(sc.nextInt());
}

As a Java 1.4 guy, I didn't know about java.util.Scanner. I found this interesting article:

http://rosettacode.org/wiki/Determine_if_a_string_is_numeric#Java

I personaly liked the solution with the scanner, very compact and still readable.