Question: Listing 6.8 implements the hex2Dec(String hexString) method, which converts a hex string into a decimal number. Implement the hex2Dec method to throw a NumberFormatException if

Listing 6.8 implements the hex2Dec(String hexString) method, which converts a hex string into a decimal number. Implement the hex2Dec method to throw a NumberFormatException if the string is not a hex string.

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