Float.floatToRawIntBits的返回值具体意思，将float转为byte数组

int i = Float.floatToRawIntBits(9f);

 public static byte[] getBytes(int      Float.floatToRawIntBits(x)) {
        return new byte[] { (byte) x, (byte) (x >>> 8), (byte) (x >>> 16),
                (byte) (x >>> 24) };
    }

[0, 0, -128, 63]