Byte to long conversion.

Question

Hello.
If you run this code, the result is "-13".
Why this if "ó" value is 243?
Thanks.
public class prueba3
public static void main(String args[])
byte[] b="óxxfd".getBytes();
long b64=0;
b64=(long)b[0];
System.out.println(b64);
}

Answer 1

Hi elchaschab.
Your method works, but needs a minimal of an Array of 8 bytes to work and consumes much processor in long process, like for example in array of 65555 bytes.
I have proven the following code, but she does not convince to me because Java must to be able of a simple form to turn a byte to long without problems, no?
public class prueba3
public static void main(String args[])
byte[] b="óxxfd".getBytes();
long b64=0;
for(int cont=0;cont<b.length;cont++) {
b64=(long)b[cont];
if(b64<0) b64=((b[cont]^254)*-1); // This line run ok, turns only the signed values to unsigned.
System.out.println("b64("+((char)b[cont])+")="+b64);