float to byte[]

Reverse a byte[] in Java:

public static byte[] reverse(byte[] arr)
{
    byte[] buf = new byte[arr.length];
    int len = arr.length;
    for (int i = 0; i < len; i++) {
        buf[i] = arr[len - 1 - i];
    }
    return buf;
}

Java float -> byte[] :

  public static byte[] floatToByteArray(float value) 
  {
      int intBits =  Float.floatToIntBits(value);
      return new byte[] {
          (byte) (intBits >> 24), 
          (byte) (intBits >> 16), 
          (byte) (intBits >> 8), 
          (byte) (intBits) 
      };
  }

A more elegant way one-liner to do float -> byte[] :

ByteBuffer.allocate(4).putFloat(value).array();

Java byte[] -> float

  byte b[] = new byte[4]; 
  ByteBuffer buffer = ByteBuffer.wrap(b);
  float fval = buffer.getFloat();