Question

My code is :

String str= (char)255 + (char)255 +"1" ;
byte[] sendbuf = str.getBytes();
outputPacket = new DatagramPacket(sendbuf,sendbuf.length,remoteIP,2280);

logSocket.send(outputPacket);

the result I get is “0x35 0x31 0x30 0x31”

but what I want is :0xff 0xff 0x31

How to do this?

Answer 1

Your str is adding the two chars first, so it’s basically this:

String str = (char)(255 + 255) + "1"; // 5101

What you want is (something like) this:

String str = (char) 255 + "" + (char) 255 + "1";

Or, using String.format:

String str = String.format("%c%c%d", 255, 255, 1);