How to have java.lang

Question

Hi guys
when I download the package javacard development kit 2.2.1 from SUN, there's a file "api.jar" in it which can be used as Javacard API. Hence, it's quite easy for the applet developer to import this file into their applet and run this normally
For my own sake, I now just want to have the package java.lang.* (it can be either a jar file or a folder of class files) --> How can I have it??
P/S: I've tried to extract "api.jar" then wrapped the folder of java.lang + java.lang (export file) into a jar file (temporarily called lang.jar). However, this way didn't work out

Answer 1

When I finish creating the javacard.framework, it's necessary to wrap it into a jar file (library file) and import it into normal applets, hence the applet can run normally and invoke methods from javacard.framework.
However, when I do so, there's always a problem of missing java.lang. * (a java.lang package for javacard only).
P/S: I've tried to extract "api.jar" then wrapped the folder of java.lang + java.lang (export file) into a jar file (temporarily called lang.jar). However, this way didn't work outWell, honestly, by this way, I made it. Finally, I built a jar file of java.lang and can put it into java card applet project
I did it as below:
(IDE - Netbean 6.9.1)
1. Create a java card classic library project named com.sun.java.impl (this package is used in the future; it contains some classes which will be called by methods in javacard.framework)
2. Fulfill the code for those classes in this class
3. Build this class --> we have expt file and class file of all classes of this package -->wrap them into a jar file (let's call it impl.jar)
4. Extract api.jar from Java Card Development Kit 2.2.1 (provided by SUN) --> retrieve the package java.lang (including class files such as Object.class, NullPointerException.class,... and export file of this package) --> wrap them into a jar file (let's call it javalang.jar)
5. Create a javacard extension library project named javacard.framework
6. Fulfill the code for those classes in this class (import impl.jar and javalang.rar as library for this package)
7. Build this package (javacard.framework) ~~> we have a jar file (let's call it api.jar) and class files, but export file ~~> when importing this jar to an applet project, an error (missing of expt file) is sprung
========> I do not know why there is no expt file being created during the build of javacard.framework. Is it because the difference of Classic and Extension Project
Remember I tried to build javacard.framework within Classic project, but failed