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

Question

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

Answer 1

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