Class that manage directory

hello,
I'm looking for a class that manage a directory.
the class should "know" the names of the files it owns,
and has to be able to create a new files in it.
i looked for suck, but didn't find,
and i believe it is exist.
(as a student, i should write a small compiler.
the compiler should get a directory name,
and it need to translate the source files to dest. files written in the intermediate language.
(the next stage is to translate from the intermediate language to machine language).)
thank a lot!!

naama749 wrote:
i looked for suck, but didn't find,That is very unfortunate.
~

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Always running class that manages DB connections

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You would want to make your manejaConexiones class a singleton.public class manejaConexiones{
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HTH

Importing a class that is stored online

I hope this is the right forum... appologies if not.
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So it's not possible for Java to read classes that
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Also, I already found that the class had no package. Then you are out of luck.
As of java 1.4 you can no longer import classes that are not in a package. [url http://bugs.sun.com/bugdatabase/view_bug.do;jsessionid=c85f07c1ce8f344d787b7a5146d68:WuuT?bug_id=4361575 ] Full details here
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Import classes that are not part of any package

I have this problem with the JDK1.4 compiler:
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Removing the entire import statement should work. Check for a classpath problem if it
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Hi!
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Message was edited by: Riccardo Escher

HELP PLEASE urgent: Creating a package, and class that prints all...

please help, 5 duke dollars up for the best answer, or first answer that solves my problem!
Hello, I have created a package called molecule that contains classes named Water, Sugar, Carbon Dioxide, and SulfuricAcid, and a sub-package named molecule.atom. The atom sub-package contains classes named Carbon, Hydrogen, Oxygen, and Sulfur. Each class in the molecule package should re-define the toString() method to print the numbers and types of atoms that constitute the molecule. For example, molecule.Sugar.toString() should return the string:
"Sugar: 6 Carbon, 12 Hydrogen, 6 Oxygen".
So basically, I have created a folder in C:\molecule\ and a subfolder C:\molecule\atom\ . I have also created a class called ChemTest belonging to the default package. ChemTest.main() creates and prints instances of each molecule and atom, but does not contain any import statements. The problem is that the ChemTest.java file won't compile coming up with 16 errors!
Can someone explain to me what I am doing wrong?
here is one of the molecule classes, for example CarbonDioxide.java:
package molecule;
public class CarbonDioxide
     private String co2;
     public CarbonDioxide()
          co2 = "Carbon Dioxide: 1 Carbon, 2 Oxygen";
     public String toString()
          return co2;
and here is one of the atom classes, for example Carbon.java:
package molecule.atom;
public class Carbon
     private String c;
     public Carbon()
          c = "Carbon: symbol = C, num = 6, weight = 12.011";
     public String toString()
          return c;
now here is the ChemTest.java file that won't compile:
public class ChemTest
     public static void main(String[]args)
          molecule.Water water = new molecule.Water();
          molecule.Sugar sugar = new molecule.Sugar();
          molecule.CarbonDioxide carbonDioxide = new molecule.CarbonDioxide();
          molecule.SulfuricAcid sulfuricAcid = new molecule.SulfuricAcid();
          molecule.atom.Carbon carbon = new molecule.atom.Carbon();
          molecule.atom.Oxygen oxygen = new molecule.atom.Oxygen();
          molecule.atom.Hydrogen hydrogen = new molecule.atom.Hydrogen();
          molecule.atom.Sulfur sulfur = new molecule.atom.Sulfur();
          System.out.println(water.toString());
          System.out.println(sugar.toString());
          System.out.println(carbonDioxide.toString());
          System.out.println(sulfuricAcid.toString());
          System.out.println();
          System.out.println(carbon.toString());
          System.out.println(oxygen.toString());
          System.out.println(hydrogen.toString());
          System.out.println(sulfur.toString());
and finally, here are the errors:
C:\molecule\ChemTest.java:5: cannot resolve symbol
symbol : class Water
location: package molecule
          molecule.Water water = new molecule.Water();
^
C:\molecule\ChemTest.java:5: cannot resolve symbol
symbol : class Water
location: package molecule
          molecule.Water water = new molecule.Water();
^
C:\molecule\ChemTest.java:6: cannot resolve symbol
symbol : class Sugar
location: package molecule
          molecule.Sugar sugar = new molecule.Sugar();
^
C:\molecule\ChemTest.java:6: cannot resolve symbol
symbol : class Sugar
location: package molecule
          molecule.Sugar sugar = new molecule.Sugar();
^
C:\molecule\ChemTest.java:7: cannot resolve symbol
symbol : class CarbonDioxide
location: package molecule
          molecule.CarbonDioxide carbonDioxide = new molecule.CarbonDioxide();
^
C:\molecule\ChemTest.java:7: cannot resolve symbol
symbol : class CarbonDioxide
location: package molecule
          molecule.CarbonDioxide carbonDioxide = new molecule.CarbonDioxide();
^
C:\molecule\ChemTest.java:8: cannot resolve symbol
symbol : class SulfuricAcid
location: package molecule
          molecule.SulfuricAcid sulfuricAcid = new molecule.SulfuricAcid();
^
C:\molecule\ChemTest.java:8: cannot resolve symbol
symbol : class SulfuricAcid
location: package molecule
          molecule.SulfuricAcid sulfuricAcid = new molecule.SulfuricAcid();
^
C:\molecule\ChemTest.java:10: cannot resolve symbol
symbol : class Carbon
location: package atom
          molecule.atom.Carbon carbon = new molecule.atom.Carbon();
^
C:\molecule\ChemTest.java:10: cannot resolve symbol
symbol : class Carbon
location: package atom
          molecule.atom.Carbon carbon = new molecule.atom.Carbon();
^
C:\molecule\ChemTest.java:11: cannot resolve symbol
symbol : class Oxygen
location: package atom
          molecule.atom.Oxygen oxygen = new molecule.atom.Oxygen();
^
C:\molecule\ChemTest.java:11: cannot resolve symbol
symbol : class Oxygen
location: package atom
          molecule.atom.Oxygen oxygen = new molecule.atom.Oxygen();
^
C:\molecule\ChemTest.java:12: cannot resolve symbol
symbol : class Hydrogen
location: package atom
          molecule.atom.Hydrogen hydrogen = new molecule.atom.Hydrogen();
^
C:\molecule\ChemTest.java:12: cannot resolve symbol
symbol : class Hydrogen
location: package atom
          molecule.atom.Hydrogen hydrogen = new molecule.atom.Hydrogen();
^
C:\molecule\ChemTest.java:13: cannot resolve symbol
symbol : class Sulfur
location: package atom
          molecule.atom.Sulfur sulfur = new molecule.atom.Sulfur();
^
C:\molecule\ChemTest.java:13: cannot resolve symbol
symbol : class Sulfur
location: package atom
          molecule.atom.Sulfur sulfur = new molecule.atom.Sulfur();
^
16 errors
Please help!!!, thanks!

HI,
I tried your problem with the following directory structure:c:\java\ChemTest.java
c:\java\molecule\CarbonDioxide.java
c:\java\molecule\atom\Carbon.javaI set the dos-prompt to c:\java and ran the following commands:javac molecule\CarbonDioxide.java
javac molecule\atom\Carbon.java
javac -classpath . ChemTest.java- and it worked!
Sure, in ChemTest.java I deleted all the lines refering to classes that you didn't post...
I hope this helps you!
Anja

How to preverify all classes under a directory and subdirectories?

I have compiled all my java codes into class files in "build/classes" directory. Now I am trying to preverify the class files with the following command:
preverify -classpath /opt/midp/classes:build/classes -d build/preverified build/classes
However the command completes execution and when I check "build/preverified" directory, I find it empty. I would like to mention that "build/classes" contains a directory structure of "com/hp/...."
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If you use Chris Poole's XUTL_FTL package, I believe that contains functions that allows you to query the directory contents.
http://www.chrispoole.co.uk/apps/xutlftp.htm
Edited by: BluShadow on Jan 13, 2009 1:54 PM
misread the original post

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Cannot resolve symbol error when compiling a class that calls another class

I've read all the other messages that include "cannot resolve symbol", but no luck. I've got a small app - 3 classes all in the same package. BlackjackDAO and Player compile OK, but BlackjackServlet throws the "cannot resolve symbol" (please see pertinent code below)...
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tomcat version: 4.1.1.8
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ant version: 1.4.1
I get the same error message from Ant and Javac...
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compile error:
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symbol: method addPlayer (javax.servlet.http.HttpServletRequest,javax.servlet.http.Http
ServletResponse)
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^
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package myblackjackpackage;
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;
import java.lang.*;
/** controller servlet in a web based blackjack game application @author Ethan Harlow */
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 catch (ClassNotFoundException cnf) {
 System.err.println(cnf.toString());
 catch (SQLException seq) {
 System.err.println(seq.toString());
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 throws ServletException, IOException {
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 throws ServletException, IOException {
 String command = request.getParameter("command");
 if (command == null || (command.equals("stats"))) {
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 else if (command.equals("play")) {
 else if (command.equals("bet")) {
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 else if (command.equals("split")) {
 else if (command.equals("double")) {
 else if (command.equals("dealerdecision")) {
 else if (command.equals("reinvest")) {
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 else if (command.equals("deal")) {
package myblackjackpackage;
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;
import java.lang.*;
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 private Connection myConn;
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 throws IOException, ClassNotFoundException, SQLException {
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 throws IOException, SQLException {
//I've commented out all my code while debugging, so I didn't include
//any here
compiler feedback
C:\Tomcat4118\src\webapps\helloblackjack\src\myblackjackpackage>javac *.java -verbose
[parsing started BlackjackDAO.java]
[parsing completed 90ms]
[parsing started BlackjackServlet.java]
[parsing completed 10ms]
[parsing started Player.java]
[parsing completed 10ms]
[loading c:\j2sdk14003\jre\lib\rt.jar(java/lang/Object.class)]
[loading c:\j2sdk14003\jre\lib\rt.jar(java/sql/Connection.class)]
[loading c:\j2sdk14003\jre\lib\rt.jar(java/lang/String.class)]
[loading c:\j2sdk14003\jre\lib\rt.jar(java/io/IOException.class)]
[loading c:\j2sdk14003\jre\lib\rt.jar(java/lang/ClassNotFoundException.class)]
[loading c:\j2sdk14003\jre\lib\rt.jar(java/sql/SQLException.class)]
[loading c:\tomcat4118\common\lib\servlet.jar(javax/servlet/http/HttpServletRequ
est.class)]
[loading c:\tomcat4118\common\lib\servlet.jar(javax/servlet/http/HttpServletResp
onse.class)]
[loading c:\tomcat4118\common\lib\servlet.jar(javax/servlet/http/HttpServlet.cla
ss)]
[loading c:\tomcat4118\common\lib\servlet.jar(javax/servlet/GenericServlet.class
[loading c:\tomcat4118\common\lib\servlet.jar(javax/servlet/Servlet.class)]
[loading c:\tomcat4118\common\lib\servlet.jar(javax/servlet/ServletConfig.class)
[loading c:\j2sdk14003\jre\lib\rt.jar(java/io/Serializable.class)]
[loading c:\tomcat4118\common\lib\servlet.jar(javax/servlet/ServletException.cla
ss)]
[checking myblackjackpackage.BlackjackDAO]
[loading c:\j2sdk14003\jre\lib\rt.jar(java/lang/Throwable.class)]
[loading c:\j2sdk14003\jre\lib\rt.jar(java/lang/Exception.class)]
[loading c:\j2sdk14003\jre\lib\rt.jar(java/lang/System.class)]
[loading c:\j2sdk14003\jre\lib\rt.jar(java/io/PrintStream.class)]
[loading c:\j2sdk14003\jre\lib\rt.jar(java/io/FilterOutputStream.class)]
[loading c:\j2sdk14003\jre\lib\rt.jar(java/io/OutputStream.class)]
[loading c:\j2sdk14003\jre\lib\rt.jar(java/lang/Class.class)]
[loading c:\j2sdk14003\jre\lib\rt.jar(java/sql/DriverManager.class)]
[loading c:\j2sdk14003\jre\lib\rt.jar(java/util/Properties.class)]
[loading c:\j2sdk14003\jre\lib\rt.jar(java/lang/Error.class)]
[loading c:\j2sdk14003\jre\lib\rt.jar(java/lang/RuntimeException.class)]
[loading c:\j2sdk14003\jre\lib\rt.jar(java/lang/StringBuffer.class)]
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[loading c:\tomcat4118\common\lib\servlet.jar(javax/servlet/ServletRequest.class
BlackjackServlet.java:55: cannot resolve symbol
symbol : method addPlayer (javax.servlet.http.HttpServletRequest,javax.servlet
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location: class myblackjackpackage.BlackjackServlet
addPlayer(request, response);
^
[loading c:\tomcat4118\common\lib\servlet.jar(javax/servlet/ServletResponse.clas
s)]
[loading c:\j2sdk14003\jre\lib\rt.jar(java/io/PrintWriter.class)]
[loading c:\j2sdk14003\jre\lib\rt.jar(java/io/Writer.class)]
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[total 580ms]
1 error
C:\Tomcat4118\src\webapps\helloblackjack\src\myblackjackpackage>
and here's the ant feedback...
C:\Tomcat4118\src\webapps\helloblackjack>ant all -verbose
Ant version 1.4.1 compiled on October 11 2001
Buildfile: build.xml
Detected Java version: 1.4 in: c:\j2sdk14003\jre
Detected OS: Windows 2000
parsing buildfile C:\Tomcat4118\src\webapps\helloblackjack\build.xml with URI =
file:C:/Tomcat4118/src/webapps/helloblackjack/build.xml
Project base dir set to: C:\Tomcat4118\src\webapps\helloblackjack
Build sequence for target `all' is [clean, prepare, compile, all]
Complete build sequence is [clean, prepare, compile, all, javadoc, deploy, dist]
clean:
[delete] Deleting directory C:\Tomcat4118\src\webapps\helloblackjack\build
[delete] Deleting C:\Tomcat4118\src\webapps\helloblackjack\build\images\a_s.g
if
[delete] Deleting C:\Tomcat4118\src\webapps\helloblackjack\build\images\q_s.g
if
[delete] Deleting directory C:\Tomcat4118\src\webapps\helloblackjack\build\im
ages
[delete] Deleting C:\Tomcat4118\src\webapps\helloblackjack\build\index.html
[delete] Deleting C:\Tomcat4118\src\webapps\helloblackjack\build\newplayer.ht
ml
[delete] Deleting C:\Tomcat4118\src\webapps\helloblackjack\build\WEB-INF\clas
ses\myblackjackpackage\BlackjackDAO.class
[delete] Deleting directory C:\Tomcat4118\src\webapps\helloblackjack\build\WE
B-INF\classes\myblackjackpackage
[delete] Deleting directory C:\Tomcat4118\src\webapps\helloblackjack\build\WE
B-INF\classes
[delete] Deleting C:\Tomcat4118\src\webapps\helloblackjack\build\WEB-INF\web.
xml
[delete] Deleting directory C:\Tomcat4118\src\webapps\helloblackjack\build\WE
B-INF
[delete] Deleting directory C:\Tomcat4118\src\webapps\helloblackjack\build
prepare:
[mkdir] Created dir: C:\Tomcat4118\src\webapps\helloblackjack\build
[copy] images\a_s.gif added as C:\Tomcat4118\src\webapps\helloblackjack\bui
ld\images\a_s.gif doesn't exist.
[copy] images\q_s.gif added as C:\Tomcat4118\src\webapps\helloblackjack\bui
ld\images\q_s.gif doesn't exist.
[copy] index.html added as C:\Tomcat4118\src\webapps\helloblackjack\build\i
ndex.html doesn't exist.
[copy] newplayer.html added as C:\Tomcat4118\src\webapps\helloblackjack\bui
ld\newplayer.html doesn't exist.
[copy] WEB-INF\web.xml added as C:\Tomcat4118\src\webapps\helloblackjack\bu
ild\WEB-INF\web.xml doesn't exist.
[copy] omitted as C:\Tomcat4118\src\webapps\helloblackjack\build is up to
date.
[copy] images added as C:\Tomcat4118\src\webapps\helloblackjack\build\image
s doesn't exist.
[copy] WEB-INF added as C:\Tomcat4118\src\webapps\helloblackjack\build\WEB-
INF doesn't exist.
[copy] Copying 5 files to C:\Tomcat4118\src\webapps\helloblackjack\build
[copy] Copying C:\Tomcat4118\src\webapps\helloblackjack\web\images\q_s.gif
to C:\Tomcat4118\src\webapps\helloblackjack\build\images\q_s.gif
[copy] Copying C:\Tomcat4118\src\webapps\helloblackjack\web\images\a_s.gif
to C:\Tomcat4118\src\webapps\helloblackjack\build\images\a_s.gif
[copy] Copying C:\Tomcat4118\src\webapps\helloblackjack\web\index.html to C
:\Tomcat4118\src\webapps\helloblackjack\build\index.html
[copy] Copying C:\Tomcat4118\src\webapps\helloblackjack\web\newplayer.html
to C:\Tomcat4118\src\webapps\helloblackjack\build\newplayer.html
[copy] Copying C:\Tomcat4118\src\webapps\helloblackjack\web\WEB-INF\web.xml
to C:\Tomcat4118\src\webapps\helloblackjack\build\WEB-INF\web.xml
compile:
[mkdir] Created dir: C:\Tomcat4118\src\webapps\helloblackjack\build\WEB-INF\
classes
[javac] myblackjackpackage\BlackjackDAO.class skipped - don't know how to ha
ndle it
[javac] myblackjackpackage\BlackjackDAO.java added as C:\Tomcat4118\src\weba
pps\helloblackjack\build\WEB-INF\classes\myblackjackpackage\BlackjackDAO.class d
oesn't exist.
[javac] myblackjackpackage\BlackjackServlet.java added as C:\Tomcat4118\src\
webapps\helloblackjack\build\WEB-INF\classes\myblackjackpackage\BlackjackServlet
.class doesn't exist.
[javac] myblackjackpackage\Player.java added as C:\Tomcat4118\src\webapps\he
lloblackjack\build\WEB-INF\classes\myblackjackpackage\Player.class doesn't exist
[javac] Compiling 3 source files to C:\Tomcat4118\src\webapps\helloblackjack
\build\WEB-INF\classes
[javac] Using modern compiler
[javac] Compilation args: -d C:\Tomcat4118\src\webapps\helloblackjack\build\
WEB-INF\classes -classpath
"C:\Tomcat4118\src\webapps\helloblackjack\build\WEB-I
NF\classes;
C:\tomcat4118\common\classes;
C:\tomcat4118\common\lib\activation.jar;
C:\tomcat4118\common\lib\ant.jar;
C:\tomcat4118\common\lib\commons-collections.jar;
C:\tomcat4118\common\lib\commons-dbcp.jar;
C:\tomcat4118\common\lib\commons-logging-api.jar;
C:\tomcat4118\common\lib\commons-pool.jar;
C:\tomcat4118\common\lib\jasper-compiler.jar;
C:\tomcat4118\common\lib\jasper-runtime.jar;
C:\tomcat4118\common\lib\jdbc2_0-stdext.jar;
C:\tomcat4118\common\lib\jndi.jar;
C:\tomcat4118\common\lib\jta.jar;
C:\tomcat4118\common\lib\mail.jar;
C:\tomcat4118\common\lib\mysql_uncomp.jar;
C:\tomcat4118\common\lib\naming-common.jar;
C:\tomcat4118\common\lib\naming-factory.jar;
C:\tomcat4118\common\lib\naming-resources.jar;
C:\tomcat4118\common\lib\servlet.jar;
C:\tomcat4118\common\lib\tools.jar;
C:\j2sdk14003\lib\tools.jar;
C:\tomcat4118\ant141\lib\servlet.jar;
C:\tomcat4118\ant141\lib\jaxp.jar;
C:\tomcat4118\ant141\lib\crimson.jar;
C:\tomcat4118\ant141\lib\ant.jar;
C:\Tomcat4118\src\webapps\helloblackjack;
C:\mysql\jdbc_dvr\mm.mysql.jdbc-1.2c;
C:\Program Files\SQLserverjdbcdriver\lib\msbase.jar;
C:\Program Files\SQLserverjdbcdriver\lib\msutil.jar;
C:\Program Files\SQLserverjdbcdriver\lib\mssqlserver.jar"
-sourcepath C:\Tomcat4118\src\webapps\helloblackjack\src -g -O
[javac] Files to be compiled:
C:\Tomcat4118\src\webapps\helloblackjack\src\myblackjackpackage\BlackjackDAO
.java
C:\Tomcat4118\src\webapps\helloblackjack\src\myblackjackpackage\BlackjackSer
vlet.java
C:\Tomcat4118\src\webapps\helloblackjack\src\myblackjackpackage\Player.java
[javac] C:\Tomcat4118\src\webapps\helloblackjack\src\myblackjackpackage\Blac
kjackServlet.java:55: cannot resolve symbol
[javac] symbol : method addPlayer (javax.servlet.http.HttpServletRequest,j
avax.servlet.http.HttpServletResponse)
[javac] location: class myblackjackpackage.BlackjackServlet
[javac] addPlayer(request, response);
[javac] ^
[javac] 1 error
BUILD FAILED
C:\Tomcat4118\src\webapps\helloblackjack\build.xml:212: Compile failed, messages
should have been provided.
at org.apache.tools.ant.taskdefs.Javac.execute(Javac.java:559)
at org.apache.tools.ant.Task.perform(Task.java:217)
at org.apache.tools.ant.Target.execute(Target.java:184)
at org.apache.tools.ant.Target.performTasks(Target.java:202)
at org.apache.tools.ant.Project.executeTarget(Project.java:601)
at org.apache.tools.ant.Project.executeTargets(Project.java:560)
at org.apache.tools.ant.Main.runBuild(Main.java:454)
at org.apache.tools.ant.Main.start(Main.java:153)
at org.apache.tools.ant.Main.main(Main.java:176)
Total time: 1 second
C:\Tomcat4118\src\webapps\helloblackjack>

yes!
early on i tried: BlackjackDAO.addPlayer(request, response);
instead of: theBlackjackDAO.addPlayer(request, response);
you rock - thanks a ton

Calling Java class stored in directory from PL/SQL

Is it possible to call Java class that is stored in directory from PL/SQL
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Cheers,

user529557,
You have the following options:
* Web Services
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* EJB
* RMI
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Good Luck,
Avi.

6.1 Doesnt read classes that arent part of packages

Migrating webapps from 6.0, it appears the 6.1 server doesnt find classes that are in WEB-INF/classes directory. When I place them in packages it finds them. Do I have to convert all classes to be part of a package now?

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