Convert byte Array to Hex String in Java

The following is our byte array.

byte[] b = new byte[]{'p', 'q', 'r'};

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[]{'p', 'q', 'r'};
      /* 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

pqr
Byte array to Hex String = 707172