Java tutorial
//package com.java2s; public class Main { /** * Parses the given string and returns a double value. Returns null if the * given string is null or cannot be parsed as a double. * * @param value the string value. * @return a double value. */ public static Double parseDouble(String value) { if (value == null || value.trim().isEmpty()) { return null; } try { return Double.parseDouble(value); } catch (NumberFormatException ex) { return null; } } }