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Check the parseInt method's API doc. It defaults to base 10. 4F20 is not base 10 so you will have to specify what base you what the parseInt method to use.

Can you post code that gets that error?

Given a String as input, you could use an Integer parse method to convert that to an int value which you could then increment easily and convert its new value to hex again by using another of the...

\u is a compiler feature allowing you to enter Unicode in your source program
In your source there is no value after the \u so the compiler complains.

What data type is hexCode? What does it...