java string array med siffror

/**
 * Regular expression that matches any real number, with optional decimal point & digits
 * after the decimal, & optional positive (+) or negative (-) designation.
 */ 
static private final String REAL_NUMBER = "^[-+]?\\d+(\\.\\d+)?$";
...
//----------------------------------------------------------------------------------------------
/**
 * Determines if a string contains only digits, decimal points & hyphens.
 * @param string The string to check.
 * @return <code>True</code> if it has only digits, else <code>false</code>.
 * @since J2SE 1.4
 */
static public boolean isNumeric(String string)
{
   return string.matches(REAL_NUMBER);
}