126 NumberFormatException Listing 68 implements the hex2DecS

*12.6 (NumberFormatException) 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. *JAVA*

Solution

import java.util.Scanner;

public class HexToDecimal {

public static void main(String[] args) {
System.out.print(\"Enter Hexadecimal:\");
      
Scanner scan = new Scanner(System.in); // crating scan object

String input = scan.nextLine();// taking line of chars as input

try{ // try block

Integer Decimal = Integer.parseInt(input, 16);// converting input to decimal

System.out.println(\"Decimal Equivalent : \"+Decimal);// displying decimalnumber

}

catch(NumberFormatException exception){
System.out.println(\"Invalid Input\"+exception.getMessage()); // printing exception message
}

finally{ scan.close();// final block

}
}
}