methods for creating a self-contained .jar with data file

   Given Main.java, data1.dat, data2.dat,
   methods for creating a self-contained .jar with data file
     0.use getResourceAsStream to get jar data at package root
         InputStream is = Main.class.getResourceAsStream("/"+dataName);

     1.add to all *.java source
         package my.package;

     2.compile with package start location
         java -d . *.java

     3.vi manifest.txt
       #Class-Path: my.package
       Main-Class: my.package.Main

     4.produce jar file with data files
         jar cvfm mypackage.jar manifest.txt my data1.dat data2.dat

     5.run by
         java -jar mypackage.jar
         java -cp mypackage.jar my.package.Main