Convert byte array to Hex String : Hex Oct « Data Type « Java Tutorial

1. Java Tutorial
2. Data Type
3. Hex Oct

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import java.security.SecureRandom;
import java.util.Random;

public class StringUtils
{


  /**
   *  Generates a hexadecimal string from an array of bytes.  For
   *  example, if the array contains { 0x01, 0x02, 0x3E }, the resulting
   *  string will be "01023E".
   *
   * @param bytes A Byte array
   * @return A String representation
   * @since 2.3.87
   */
  public static String toHexString( byte[] bytes )
  {
      StringBuffer sb = new StringBuffer( bytes.length*2 );
      for( int i = 0; i < bytes.length; i++ )
      {
          sb.append( toHex(bytes[i] >> 4) );
          sb.append( toHex(bytes[i]) );
      }

      return sb.toString();
  }
  private static char toHex(int nibble)
  {
      final char[] hexDigit =
      {
          '0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'
      };
      return hexDigit[nibble & 0xF];
  }


}