Help assigning value to byte data type...

[jeffbroodwar]

Hello, i have a problem about assigning a char value to a byte... please check the code below :

================================================== ======
Scenario # 1 : This code doesn't work :

byte[] buffer = new byte[256];
char tempValue;
int StartAddress;

buffer[StartAddress] = tempValue;

ERROR : possible loss of precision
explanation : if i try to save a char variables value to byte,i get the error message above....

================================================== =======


================================================== ======
Scenario # 2 : This code doesn't work :

byte[] buffer = new byte[256];
int StartAddress;

buffer[StartAddress] = '10';

ERROR : unclosed character literal bla bla bla bla
explanation : if i try to save a char value composed of 2 characters to byte,i get the error message above....

================================================== =======


================================================== ======
Scenario # 3 : This code works :

byte[] buffer = new byte[256];
int StartAddress;

buffer[StartAddress] = '2';

explanation : if i try to save a char value composed of 1 character to byte,i dont get any error. but the problem is i need to make Scenario # 1 work. what i need is to save the content of character Ex: charVariable = Microsoft to this array of bytes using charAt........ i cant make it work using charAt... it seems that it's looking for the ' ' symbols before and after the character values..... please help. thanks in advance..
================================================== =======

[r035198x]

Hello, i have a problem about assigning a char value to a byte... please check the code below :

================================================== ======
Scenario # 1 : This code doesn't work :

byte[] buffer = new byte[256];
char tempValue;
int StartAddress;

buffer[StartAddress] = tempValue;

ERROR : possible loss of precision
explanation : if i try to save a char variables value to byte,i get the error message above....

================================================== =======


================================================== ======
Scenario # 2 : This code doesn't work :

byte[] buffer = new byte[256];
int StartAddress;

buffer[StartAddress] = '10';

ERROR : unclosed character literal bla bla bla bla
explanation : if i try to save a char value composed of 2 characters to byte,i get the error message above....

================================================== =======


================================================== ======
Scenario # 3 : This code works :

byte[] buffer = new byte[256];
int StartAddress;

buffer[StartAddress] = '2';

explanation : if i try to save a char value composed of 1 character to byte,i dont get any error. but the problem is i need to make Scenario # 1 work. what i need is to save the content of character Ex: charVariable = Microsoft to this array of bytes using charAt........ i cant make it work using charAt... it seems that it's looking for the ' ' symbols before and after the character values..... please help. thanks in advance..
================================================== =======

char is wider than a byte.
Read the first 3 posts of this article.

[jeffbroodwar]

Hi, nice article you have there.... i actually saved it. ehehe. regarding that article.... why does java allow me to declare :

byte[] buffer = new byte[256];

if byte's maximum value is 127?




And can you help me with this problem?
- I need to save the character Ripple in byte array buffer[6] - buffer[35] the remaining bytes will be filled in with spaces... see code below

// Write spaces
for (int i=0; i<164; i++)
{
buffer[i] = 32;
}

(the decimal value 32's equivalent ascii character = space)
if Ripple word will consume indexes 6 - 11 then 12 - 35will remain as spaces(32)

all i need to do is save each character of Ripple saved inside the variable CompanyName to indexes 6 - 11. please take a look at the source below :

buffer[i]= 'R';
System.out.println("Result saved R value is: " + buffer[i]);
The printed value is 82.

you see, i can't find a way to save this character one by one placing each character inside the ' ' symbols. placing each character in the variable company insid the ' ' symbols gives me the headache....... the bottom line is :

buffer[6] = 82
buffer[7] = 105
buffer[8] = 112
buffer[9] = 112
buffer[10] = 108
buffer[11] = 101

each array from 6 -11 index will have the decimal values of characters Ripple


I hope i'm not asking too much sir, but i know my next question is just a very basic question to you.... hope you'll be patient enough to help me with all of these ^^;

- My next question is about the java file....

1. i can't make the jar file run without typing java - jar in the command line i have a sample program i created before that runs without java -jar... just the .jar file
2. can i make the .jar file run without the dist folder? just like the .exe files?
3. i can't display the hello world (WTF?? very basic eh? ehehe..^^; ) in the dos prompt using javac Main.java then java Main (an error occurs saying : Exception in thread "main" java.lang.UnsupportedClassVersionError : Main <Unsupported major.minor version 50.0>

LAST OF ALL : can i add you as my buddy here? so that i'll just ask questions directly to you..... cause sometimes it takes weeks before i get an answer and to top it all up, all i get is a WRONG one / just a comment. since your good with java, i guess you can be my java guru.... ehehe please? thanks
for being nice.... take care !


Best Regards,
Jeff

[r035198x]

.... why does java allow me to declare :

byte[] buffer = new byte[256];

if byte's maximum value is 127?

127 is the maximum size for a byte not for a byte[].
Arrays can be as long as the maximum int value (since array.length returns an int).

And can you help me with this problem?
- I need to save the character Ripple in byte array buffer[6] - buffer[35] the remaining bytes will be filled in with spaces... see code below

// Write spaces
for (int i=0; i<164; i++)
{
buffer[i] = 32;
}

(the decimal value 32's equivalent ascii character = space)
if Ripple word will consume indexes 6 - 11 then 12 - 35will remain as spaces(32)

all i need to do is save each character of Ripple saved inside the variable CompanyName to indexes 6 - 11. please take a look at the source below :

buffer[i]= 'R';
System.out.println("Result saved R value is: " + buffer[i]);
The printed value is 82.

char is wider than byte. If you want to manipulate chars just use a char[]

- My next question is about the java file....

1. i can't make the jar file run without typing java - jar in the command line i have a sample program i created before that runs without java -jar... just the .jar file
2. can i make the .jar file run without the dist folder? just like the .exe files?
3. i can't display the hello world (WTF?? very basic eh? ehehe..^^; ) in the dos prompt using javac Main.java then java Main (an error occurs saying : Exception in thread "main" java.lang.UnsupportedClassVersionError : Main <Unsupported major.minor version 50.0>

The point of making a .jar is so that you run it as you would a .exe. Read the jar files tutorial here and see how to make them effectively.

You seem to have a JDK that is newer than your JRE.


P.S All java forum posters are buddies. If you get any problem just post here in the forums where all your buddies will be able to help.

[jeffbroodwar]

ok, thanx............................