convert string to byte[]

[nickyeng]

I have this simple question but i dont know which method to convert it..

the case is like this:

i have encrypted a string in byte[] form.

and since it is a string already, but in the end i still need to decrypted it back to original string. for example:

String str = "Peter is smart";
 
// encrypt it
byte[] data = enc.encryptString(str);
 
String test_str = data.toString();
System.out.println(test_str);     // this value is : [B@356f
 
 

String str2 = getTest_Str();  // this String field is a must and value is [B@356f
 
// here i want to make the string into byte[]
byte[] bb = str2.someMethod();  
 
System.out.println(bb);    // i want this bb value to be exactly the same as test_str above, is [B@356f.
 
// here i can do decryption which take byte[] as parameter.
System.out.println(enc.decryptString( bb ));  // this should print "Peter is smart"
 

how to make the string to byte[] without changing the value?

any idea of what i'm talking about ?
any idea ?

thanks in advance.
Nick

[JosAH]

One of the constructors of the String class takes a byte[] array as an argument.

kind regards,

Jos

[nickyeng]

One of the constructors of the String class takes a byte[] array as an argument.

kind regards,

Jos

i know.

maybe the way i explain is confusing but the string is [@B43f.

decryptString(byte[] b) takes byte[] as argument.

So i have to make "[@B43f" to byte[] first, and then pass to decryptString(xx) method.

but i dont know how to make a string to byte[] without changing the value(in this case is [@B43f ) so that the string is [@B43f and the byte array is also [@B43f.

String(byte[]) returns string, not return byte[], so it not help in this case.

any idea?

[nickyeng]

somehow look like this:

 
String str = "[@B43f";
 
byte[] b = str.clone();
 
System.out.println("b = " + b);   // if this value is [@B43f, then means this is what i want.
 
 

but i'm not sure whether this is the way of doing it cos i dont have Eclipse or jdk in my pc here.

[BigDaddyLH]

somehow look like this:

 
String str = "[@B43f";
 
byte[] b = str.clone();
 
System.out.println("b = " + b);   // if this value is [@B43f, then means this is what i want.
 
 

but i'm not sure whether this is the way of doing it cos i dont have Eclipse or jdk in my pc here.

Wait until you have access to a compiler, then. Us telling you yes or no isn't going to help you learn.

[nickyeng]

Wait until you have access to a compiler, then. Us telling you yes or no isn't going to help you learn.

it doesn't work in j2me application.

i've tried.

any method to do that?

[BigDaddyLH]

it doesn't work in j2me application.

Why doesn't it work? Analyzing why it failed may help you find a solution.

[nickyeng]

i found code from website eventually that helps me with that.

thanks for your time tho.

NickyEng

[nickyeng]

Why doesn't it work? Analyzing why it failed may help you find a solution.

you're talking like talk pointless.

if everyone could analyze the question, then we don't need to come here and post question tho.

anyway, thanks.

[BigDaddyLH]

you're talking like talk pointless.

if everyone could analyze the question, then we don't need to come here and post question tho.

anyway, thanks.

I was replying to your post where you said

it doesn't work in j2me application.

It's important to learn how to express problems in better detail. You don't just go to your doctor and only say "I am unwell." Perhaps this article should be in a sticky post at the top of the forum:

How to ask questions the smart way.