(HexFormatException) Exercise 14.6 implements the hexToDecimal method to throw a NumberFormatException if the string is not a hex string. Define a custom exception called HexFormatException. Implement the hexToDecimal method to throw a HexFormatException if the string is not a hex string.
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(NumberFormatException) Listing 9.2 implements the hexToDecimal(String hexString) method, which converts a hex string into a decimal number. Implement the hexToDecimal method to throw a NumberFormatException if the string is not a hex string.
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