convert a String to a long with Java?

public class s2l {

  public static void main (String[] args) {

     // String s = "fred";    // do this if you want an exception

     String s = "100";

     try {
        long l = Long.parseLong(s.trim());
        System.out.println("long l = " + l);
     } catch (NumberFormatException nfe) {
        System.out.println("NumberFormatException: " + nfe.getMessage());
     }

  }

Other notes

• Long.toString(long l) is used to convert in the other direction, from long to String.
  
• If you're interested in converting a String to a Long object, use the valueOf() method of the Long class instead of the parseLong() method.

}