Programming Forums - View Single Post - representing the extended ASCII set in Strings

hbe02 · Mar 11th, 2008, 11:13 AM

hi everyone,
im working on a chat application project where the user can enter some text, this text goes into my compression algorithm which outputs a set of 8 bits with values from 0-255. I need to be able to take a value like 150 and change that into a string send it via TCP, recieve it on the other end and convert it back to 150.
so this is some code i have wrote to investigate:

(Toggle Plain Text)

int value = 150;
            sendBytes[i] = (byte)value; //set char of byte

            System.out.println("BYTE = " + (int)sendBytes[i]);
            
            int rep = (int) sendBytes[0] & 0xFF;
            System.out.println("REP = " + rep);
            
            String test = new String(sendBytes,"UTF-8");

from the code above, i found that the number 150 when put into a byte will become a 2's complement number. so 128 will be -128.
the second statement "int rep = ..." will retrieve the original number..so if i say store value 128 in a byte..it will be stored as -128 but when i retrieve it with :

(Toggle Plain Text)

int rep = (int) sendBytes[0] & 0xFF;
System.out.println("REP = " + rep);

i will get the number 128 back which is great!

now i need to be able to send the number -128 or the complement of 150 which is stored in the byte via TCP through a string. how can i do tht?

Mar 11th, 2008, 11:13 AM	#1
hbe02 Hobbyist Programmer Join Date: Mar 2006 Location: Lebanon Posts: 148 Rep Power: 3	representing the extended ASCII set in Strings hi everyone, im working on a chat application project where the user can enter some text, this text goes into my compression algorithm which outputs a set of 8 bits with values from 0-255. I need to be able to take a value like 150 and change that into a string send it via TCP, recieve it on the other end and convert it back to 150. so this is some code i have wrote to investigate: (Toggle Plain Text) int value = 150; sendBytes[i] = (byte)value; //set char of byte System.out.println("BYTE = " + (int)sendBytes[i]); int rep = (int) sendBytes[0] & 0xFF; System.out.println("REP = " + rep); String test = new String(sendBytes,"UTF-8"); int value = 150; sendBytes[i] = (byte)value; //set char of byte System.out.println("BYTE = " + (int)sendBytes[i]); int rep = (int) sendBytes[0] & 0xFF; System.out.println("REP = " + rep); String test = new String(sendBytes,"UTF-8"); from the code above, i found that the number 150 when put into a byte will become a 2's complement number. so 128 will be -128. the second statement "int rep = ..." will retrieve the original number..so if i say store value 128 in a byte..it will be stored as -128 but when i retrieve it with : (Toggle Plain Text) int rep = (int) sendBytes[0] & 0xFF; System.out.println("REP = " + rep); int rep = (int) sendBytes[0] & 0xFF; System.out.println("REP = " + rep); i will get the number 128 back which is great! now i need to be able to send the number -128 or the complement of 150 which is stored in the byte via TCP through a string. how can i do tht?