File list (Check if you may need any files):
dataStudy
.........\.classpath
.........\.project
.........\.settings
.........\.........\org.eclipse.jdt.core.prefs
.........\1.jpg
.........\1pak.jpg
.........\bin
.........\...\dataconn
.........\...\........\conndemo.class
.........\...\........\crud.class
.........\...\........\JdbcUtils.class
.........\...\........\sqlutil.class
.........\...\........\testBig.class
.........\...\........\testBigbyte.class
.........\...\........\testUtils.class
.........\...\jdbc
.........\...\....\bll
.........\...\....\...\daoExpertion.class
.........\...\....\...\UserDao.class
.........\...\....\data
.........\...\....\....\service
.........\...\....\....\.......\testMain.class
.........\...\....\....\.......\userService.class
.........\...\....\....\users.class
.........\src
.........\...\dataconn
.........\...\........\conndemo.java
.........\...\........\crud.java
.........\...\........\JdbcUtils.java
.........\...\........\sqlutil.java
.........\...\........\testBig.java
.........\...\........\testBigbyte.java
.........\...\........\testUtils.java
.........\...\jdbc
.........\...\....\bll
.........\...\....\...\daoExpertion.java
.........\...\....\...\UserDao.java
.........\...\....\data
.........\...\....\....\service
.........\...\....\....\.......\testMain.java
.........\...\....\....\.......\userService.java
.........\...\....\....\users.java
.........\test.java