Answer by Karthik T for How to check if a string is numeric?

Many options explored at http://www.coderanch.com/t/405258/java/java/String-IsNumeric

One more is

public boolean isNumeric(String s) {      return s != null && s.matches("[-+]?\\d*\\.?\\d+");  }  

Might be overkill but Apache Commons NumberUtils seems to have some helpers as well.