Java tutorial
public class Main { public static void main(String[] args) { String str1 = "123.45"; try { double value1 = Double.parseDouble(str1); System.out.println("value1 = " + value1); } catch (NumberFormatException e) { System.out.println("Error in parsing " + str1); } String str2 = "8H.9"; // An invalid double try { double value2 = Double.parseDouble(str2); System.out.println("value2 = " + value2); } catch (NumberFormatException e) { System.out.println("Error in parsing " + str2); } } }