Write a java program that takes an input string, converts each character of the

Question

Write a java program that takes an input string, converts each character of the string to a hexidecimal value, and stores it in a 2-dimensional array (matrix). The 2-dimensional array must be of size 4x4. Within the program, create a method that repeatedly takes an input string length of 16 and prints out a 4x4 array (each 4x4 array separated by a space) until the input string is completely converted an stored in an array (this case would occur if the input string length is greater than 16). Array must be filled in a column by column order. Any remaining space in the array should be filled with a substitution character, resulting in a padded matrix. Input starts with a desired substituion character, next line is followed by the input string.

Example input 1:

~

Hola

Example output 1:

48 20 7E

6F 7E 7E

6C 7E 7E

61 7E 7E

Example input 2:

0

Een goede naam is beter.

Example output 2:

45 67 65 61

65 6F 20 6D

6E 65 6E 20

20 64 61 69

(space)

73 74 30 30

20 75 30 30

62 72 30 30

65 2E 30 30

Explanation / Answer

The examples given by you does not match the problem description.

The input string should be of size 16 only and no spaces between them.

CODE:
import java.util.Scanner;

public class ToHex {

   public static void main(String[] args){
       // Scanner class to get the input from the user.
       Scanner sc = new Scanner(System.in);
      
       // read from the console.
       String st = sc.next();
      
       // declare array of size 16 to hold the output.
       String[] hexarray = new String[16];
      
       // iterate through the input and convert it to HEX.
       for (int i=0;i<st.length();i++){
           String hex = String.format("%4x", (int) st.charAt(i));
           hexarray[i] = hex;
       }
      
       // display the output.
       for(int i=0;i<hexarray.length;){
           System.out.println(hexarray[i] + " " + hexarray[i+1] + " " + hexarray[i+2] + " " + hexarray[i+3]);
           i += 4;          
       }
       System.out.println();
       sc.close();
   }  
}

OUTPUT:
Eengoedenaamisbe
45 65 6e 67
6f 65 64 65
6e 61 61 6d
69 73 62 65

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