Java Program to return the hexadecimal value of the supplied byte array

The following is the supplied byte array −

byte[] b = new byte[]{'x', 'y', 'z'};

We have created a custom method “display” here and passed the byte array value. The same method converts byte array to hex string −

public static String display(byte[] b1){
   StringBuilder strBuilder = new StringBuilder();
   for(byte val : b1){
      strBuilder.append(String.format("%02x", val&0xff));
   }
   return strBuilder.toString();
}

Let us see the entire example now −

Example

 Live Demo

public class Demo {
   public static void main(String args[]) {
      byte[] b = new byte[]{'x', 'y', 'z'};
      /* byte array cannot be displayed as String because it may have non-printable
      characters e.g. 0 is NUL, 5 is ENQ in ASCII format */
      String str = new String(b);
      System.out.println(str);
      // byte array to Hex String
      System.out.println("Byte array to Hex String = " + display(b));
   }
   public static String display(byte[] b1){
      StringBuilder strBuilder = new StringBuilder();
      for(byte val : b1){
         strBuilder.append(String.format("%02x", val&0xff));
      }
      return strBuilder.toString();
   }
}

Output

xyz
Byte array to Hex String = 78797a