English | 简体中文 | 繁體中文 | Русский язык | Français | Español | Português | Deutsch | 日本語 | 한국어 | Italiano | بالعربية

Convert byte Array to Hexadecimal String in Java

Here 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 the byte array to a hexadecimal 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();
}

Now let's look at the entire example.

Example

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);
      //Hexadecimal string byte array
      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 Result

pqr
Byte array to Hex String = 707172