Listing 6.8 implements the hex2Dec (String hexdtring) method, which converts a h

Question

Listing 6.8 implements the hex2Dec (String hexdtring) 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. Write a program that removes all the occurrences of a specified string from a text file. For example, invoking removes the string John from the specified file. Your program should get the arguments from the command line. Write a program that converts the Java source code from the next-line brace style to the end-of-line brace style. For example, the following Java source in (a) uses the next-line brace style. Your program converts it to the end-of-line brace style in (b).

Explanation / Answer

/*The java program
* implements the bin2Dec method to throw a BinaryFormatException
* Implement the bin2Dec method to throw a BinaryFormat Exception
* if the string is not a valid binary string.**/

//Bin2Dec.java
import java.util.Scanner;
public class Bin2Dec
{
   public static void main (String[] args)
   {
       Scanner keyboard = new Scanner(System.in);
       //Declare string to read user input
       String userInput;

       //read input of 1's and 0's
       System.out.print("Enter a binary string of 0s and 1s: ");
       //Save input to s variable.
       userInput = keyboard.nextLine();
       try
       {

           int decimal=bin2Dec(userInput);
           System.out.println("Binary Value : "+userInput);
           System.out.print("Equivalent decimal value is "+decimal);

       }
       //Catch the exception if input is not valid binary string
       catch (BinaryFormatException e)
       {          
           System.out.println(e);
       }

   }
   /*The method bin2Dec that takes the string input and converts
   * the binary input to decimal value .
   * If input is invalid then throws custom exception
   * BinaryFormatException*/
   public static int bin2Dec(String binary) throws BinaryFormatException                      
   {
       //integer variable
       int decimal = 0;

       //compute the value of the binary number to decimal
       for (int i = binary.length(); i > 0; i--)
       {
           //Get char at i-1 index
           char ch = binary.charAt(i - 1);
           //add the power of index values to the decimal value
           if (ch == '1'|| ch=='0') decimal += Math.pow(2, binary.length() - i);                                        
           else
               //throw exception if char is neither 1 or nor 0
               throw new BinaryFormatException("Invalid Binary Format");
       }
       //return decimal value
       return decimal;
   } //end of the method bin2Dec
  
}//end of the class

--------------------------------------------------------------------------------------------------------------------------

Sample Output:

sample run1:

Enter a binary string of 0s and 1s: 11111111
Binary Value : 11111111
Equivalent decimal value is 255

sample run2:

Enter a binary string of 0s and 1s: 12abc
BinaryFormatException: Invalid Binary Format

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