import java.lang.*;

public class ConvertHexToDecimalExample {

    public static void main(String[] args) {

        //declare string containing hexadecimal number
        String strHexNumber = "123";
        int x = 123;
        /*
         * to convert hexadecimal number to decimal number use,
         * int parseInt method of Integer wrapper class.
         *
         * Pass 16 as redix second argument.
         */

         int decimalNumber = Integer.parseInt(strHexNumber, 16);
         System.out.println("Hexadecimal number converted to decimal number");
         System.out.println("Decimal number is : " + decimalNumber);
         System.out.println(Integer.toHexString(x));

    }
}