Java Card string

Question

Hello, i am new to Java Card, i am trying to write an applet and i am stuck with strings.
Should i add some jars to my project so the String can be used? By the default project settings there are no String and strings can not be declared.
I am using JCOP tools and Eclipse IDE.
Thanks

Answer 1

Hi,
Java Card does not have a java.lang.String class. It is a cut down version of the Java runtime. In the documentation for the Java Card Development Kit, there is a rundown of what parts of the Java language are not supported. That being said, all strings are is a collection of bytes. You can represent a string as a byte array.
private final static byte[] STRING_CONSTANT = {'c', 'o', 'n', 's', 't', 'a', 'n', 't'};Also, be mindful that the JCRE does not have a garbage collector as you may know it. Some cards do support object deletion (garbage collection) but it is performed the next time the applet is activated and takes a relatively long time (it will cause performance issues if you rely on it heavily).
Cheers,
Shane
Edited by: safarmer on 28/12/2009 12:10
Edited by: safarmer on 28/12/2009 12:12