javaexceptionnumberformatexception

Exception in thread "main" java.lang.NumberFormatException: For input string: "D437D437" under radix 16

String d="0xD437D437";
System.out.println(Integer.decode(d));
Solution

  • The docs state

    This sequence of characters must represent a positive value or a NumberFormatException will be thrown.

    But 0xD437D437 is a negative value, namely -734538697, as can be seen by Integer.toHexString(-734538697) resulting in "d437d437".

    Therefore either parse it as a Long as @Bonniu says if you are looking for a positive value or if you are actually trying to parse a negative int you could just convert the resulting Long back into an Integer / int:

    Long.decode("0xD437D437").intValue() // -734538697