Package-import statement problem: Part II

Hello again everyone...
It seems all of you have mistaken my original problem to some degree. The beginning part of my DataAddingTest.java file reads like this:
// This class tests adding data to the data structures in my Risk(c) game.
package risk.tests;
import risk.*;
DataAddingTest.java is in my C:\Java\risk\tests\ directory. I am trying to import a whole bunch of files from my main risk directory, i.e., C:\Java\risk\. And it is just not working. I have no idea why. I'm pretty sure I have the correct syntax for what I'm doing; it should work. The exact error message I get at compile-time is this:
DataAddingTest.java:5: package risk does not exist
import risk.*;
^
There is indeed a C:\Java\risk\ directory (of course), and it contains many java files, all of which have "package risk;" declared at the top. And yes, I have also compiled those before I try to compile this file. Someone please help! Thanks for everyone's time.
-Billy Mahabir
PS. Reply to http://forum.java.sun.com/thread.jsp?forum=31&thread=392985
to earn some Duke Dollars for your trouble; if you can help me.

Thank you for your help; you are the first one to
successfully help me. I'll give you some DD's if you
reply to my original post:
http://forum.java.sun.com/thread.jsp?forum=31&thread=39
985
Thanks again!
-Billy MahabirHuh??
Maybe you should go back to your original post and check the last two replies.
Both tell you to do exactly that: Set your classpath!

Similar Messages

Package-Import statement problem

Greetings JDC Community...
This problem has been driving me insane for over an hour. It's a simple package-import problem. I have a file called DataAddingTest.java which is in my C:\Java\risk\tests\ directory and it has a package statement "package risk.tests;". Then I try to import all of the files I have in the risk directory by using "import risk.*;" and it whines in error that "package risk does not exist". I'm about ready to throw my computer... can someone help me? Thanks for your time.
-Billy Mahabir

Hello again everyone...
It seems all of you have mistaken my problem to some degree. The beginning part of my DataAddingTest.java file reads like this:
// This class tests adding data to the data structures in my Risk(c) game.
package risk.tests;
import risk.*;
DataAddingTest.java is in my C:\Java\risk\tests\ directory. I am trying to import a whole bunch of files from my main risk directory, i.e., C:\Java\risk\. And it is just not working. I have no idea why. I'm pretty sure I have the correct syntax for what I'm doing; it should work. The exact error message I get at compile-time is this:
DataAddingTest.java:5: package risk does not exist
import risk.*;
^
There is indeed a C:\Java\risk\ directory (of course), and it contains many java files, all of which have "package risk;" declared at the top. And yes, I have also compiled those before I try to compile this file. Someone please help! Thanks for everyone's time.
-Billy Mahabir

Java import statement problems

Hello...
I have the book "Java in a Nutshell, 2nd ed" and have a query about a nested top-level interface example they have in the book.
Basically there's two files/classes. The first, LinkedList.java, is as follows:
public class LinkedList {
    public static interface Linkable {
        // Linkable interface details here
    // rest of LinkedList class here
Next is LinkedList.java as follows:
import LinkedList.*;
class LinkableInteger2 implements Linkable {
    // rest of LinkableInteger2 class here
Now I thought the import statement had two forms - and both used a package name as part of the statement:
import package.class;
import package.*;
Obviously, neither class has a package statement.
As written, these classes do not compile. Am I right in assuming the lack of a package name is causing this problem, or is there something else going on here?
Thanks...
Mark.

Since you don't have package statements in the files, the classes are being placed in the default package. You cannot explicitly import classes from the default package. Al classes in the default package, the java.lang package and the current package are always imported automatically. Your import statement is incorrect - remove it.

Weird import statement problem

Hi
I have a strange problem with an application I just developed. Once compiled, if I try to run it on another machine other than the one I developed on, I get a NoClassDefFoundError relating to a class that I did not use. I look at the class file (in a decompiled state) and there is an import statement in there that is not in the source file!! Can anyone tell me why this might have happened?
the import is a symantec class/package I have never used to my knowledge at all and yet it shows up in the binary class file after compilation.
Thanks for any suggestions.

I did use Visual Cafe during parts of the development but I have never imported anything like what is in the class file. I assumed it was VC that was doing it but wasn't sure.
Thanks.

JSP import statement problem

Hey, I got confused with all import statement with jsp.
Here is my problem.
Folder structure:
C:\Program Files\netbeans-4.1\enterprise1\jakarta-tomcat-5.5.7\webapps\ROOT\WEB\S\A
This folder contains a.jsp.
JSP code:
<%@ page
     language="java"
     import="java.sql.*, MyPackage.DataBase"
     errorPage=". . ."
     contentType="text/html; charset=windows-1251"
%>
<%
     Connection connection = null;
     Statement statement = null;
     DataBase dataBase = new DataBase( connection, statement );
%>
...Error message that I get:
org.apache.jasper.JasperException: Unable to compile class for JSP
Generated servlet error:
C:\Program Files\netbeans-4.1\enterprise1\jakarta-tomcat-5.5.7\work\Catalina\localhost\_\org\apache\jsp\WEB\S\A\a_jsp.java:7: package MyPackage does not exist
import MyPackage.DataBase;
                   ^
An error occurred at line: 104 in the jsp file: /WEB/S/A/a.jsp
Generated servlet error:
C:\Program Files\netbeans-4.1\enterprise1\jakarta-tomcat-5.5.7\work\Catalina\localhost\_\org\apache\jsp\WEB\S\A\a100_jsp.java:147: cannot resolve symbol
symbol : class DataBase
location: class org.apache.jsp.WEB.S.A.a_jsp
     DataBase dataBase = new DataBase( connection, statement );
        ^
...How do I import that class so I can use it?
Do I need to use useBean?
What do I need to do?
Thanks

DataBase class does not extend java.sql.
I put this into my jsp page
     import="java.sql.*;"
     import="MyPackage.DataBase;" Here is the error message
Generated servlet error:
C:\Program Files\netbeans-4.1\enterprise1\jakarta-tomcat-5.5.7\work\Catalina\localhost\_\org\apache\jsp\WEB\S\A\a_jsp.java:7: 'class' or 'interface' expected
import MyPackage.DataBase;;
^
1 error
...

Package/Import statements - javac gives errors while Netbeans does not

I do not know why, but when I compile/run my code with the statements
package TavisProject;
import TavisProject.LabelAndButtonFrame;
in Netbeans, everything works properly as it should. However, if I try to compile the SAME files with javac at the cmd line, I get the errors:
C:\FinalProject\src\TavisProject>javac Main.java
Main.java:22: cannot find symbol
symbol : class LabelAndButtonFrame
location: class TavisProject.Main
LabelAndButtonFrame labelAndButtonFrame = new LabelAndButtonFram
e(); // Instantiates/calls labelAndButtonFrame
^
Main.java:22: cannot find symbol
symbol : class LabelAndButtonFrame
location: class TavisProject.Main
LabelAndButtonFrame labelAndButtonFrame = new LabelAndButtonFram
e(); // Instantiates/calls labelAndButtonFrame
^
2 errors
Also, if you comment out the statements in both files, everything compiles fine with javac. Also, please note that LabelAndButtonFrame.java is in the same folder as Main.java.
I'm trying to get a batch file to work properly that will compile/create javadoc, but I can't get it to work without figuring
out what the deal is with those package/import statments causing problems.
Thanks,
Tavis
The main code is as follows:
package TavisProject;
import TavisProject.LabelAndButtonFrame;
import javax.swing.JFrame;
* @author Tavis Curry
* @version 1.0
* This Class is called MainMethod. It instantiates/calls labelAndButtonFrame.
* Uses javax.swing.JFrame
public class Main
       * Main method
          * This method will call labeAndButtonFrame, set the default close op,
          * set the size of the jframe, and set the jframe to visible
        public static void main(String args[]){
                LabelAndButtonFrame labelAndButtonFrame = new LabelAndButtonFrame(); // Instantiates/calls labelAndButtonFrame
          labelAndButtonFrame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE ); // LabelAndButtonFrame will Exit when the X-button is clicked
                labelAndButtonFrame.setSize( 550, 70 ); // Sets frame size - width by height
                labelAndButtonFrame.setVisible(true); // Shows LabelAndButtonFrame
     } // End main method
} // End class LabelAndButtonFrameMessage was edited by:
TC10284

Thanks much. That worked.
I had EVERYTHING working except this little thing.
I'm a little confused on why it makes a difference if
I set this however. Why can the compiler not find the
files if they're in the same dir?Because it doesn't find files - it finds classes.
The fact that it can use directories to organize the hierarchy is misleading. That is an easy convention but it doesn't alter the fact that it uses the class path itself along with other rules to find classes (not files.)
>
Also, now that I have to set the classpath, how would
I get this to work inside a batch file that uses env.
variables to locate the base project?
Both the java compiler and the java vm tools support a command line option which allows you to fully specify the class path.

Import statement problem

I am getting this error message:
Generated servlet error:
C:\Program Files\Apache Software Foundation\Tomcat 5.0\work\Catalina\localhost\_\org\apache\jsp\OBJAVA\WEB\a100_jsp.java:8: package MakePosting does not exist
import MakePosting.*;
Where do I need to place my classes?
How does the folder structure should look like in tomcat?
Thanks.

Your web-application should have a WEB-INF directory and a classes directory inside that. All classes should be placed in the classes directory.
Here is the link -http://jakarta.apache.org/tomcat/tomcat-5.5-doc/appdev/deployment.html - on the organization of your directories in a j2ee web application.
cheers,
ram.

Usage of import statements

I have a problem of using packages & import statements....
Something like this...
Assume,
i have 2 java classes. (Class1.java & Class2.java)
Class1.java is in --> C:\java\examples\folder1\abc\Class1.java
Class2.java is in --> C:\java\examples\folder2\xyz\Class2.java
I need to access a variable in Class1.java from Class2.java
In that case, how can i use import statement???
"Class1.java" looks like this-->
     package abc;
     public class Class1{
        public static int value = 10;
        public static void main(String args[]){
          System.out.println("This is class1");
"Class2.java" looks like this-->
          package xyz;
     import *************************;
     public class Class2{
        public static void main(String args[]){
          System.out.println("This is class2");
          System.out.println("Class1 value is"+Class1.value);
     }In Class2.java - what should be the import statement???
(Is it import abc; OR any other)
Do i need to set the classpath to both the packages seperately???
To the C:\java\examples\folder1\abc AND C:\java\examples\folder1\xyz
If the above is incorrect, to which folder should i set the classpath?
Pls help!

The import statement should be:import abc.Class1;orimport abc.*; // not recommend because of potential name clashesYour classpath should contain both C:\java\examples\folder1 and C:\java\examples\folder2 (that is: any folders containing the top of a package hierarchy).javac -cp C:\java\examples\folder1;C:\java\examples\folder2 <javasourcefiles>

A problem from "import" statement

When I was doing some test on "package" and "import" statement, I had a problem.
1 I compiled one class:
package com.sheng.population;
public class A {
     public static int sum (int k, int l) {
          return (k+l);
2 I tried to call the method 'sum' in A:
import com.sheng.population.*;
public class B {
     public static void main(String[] args){
          int i=9;
          int j=100;
          int k = A.sum(i, j);
          System.out.println(k);
Then I got the error message:
"B.java:7: cannot access A
bad class file: E:\newjava\analysis\LDmeasure\A.java
file does not contain class A"
Only after I changed the import statement to "import com.sheng.population.A;" , then it worked.
I just do not know why the '.*' does not work?
Thanks

Let's say your directory structure is "e:\newjava\com\sheng\population\A.class" and "e:\newjava\analysis\LDmeasure\A.java"
If your Classpath is .;e:\newjava and when you compile, your current directory is e:\newjava\analysis\LDmeasure then you have A.java and A.class in your Classpath. When you use "import com.sheng.population.*;" the compiler does not know you mean com.sheng.population.A. The compiler finds A.java and thinks it is the A class that the B class needs. When it tries to compile A.java it finds the class name is com.sheng.population.A which causes the error. When you use "import com.sheng.population.A;" the compiler does not try to use A.java.
If you are keeping the source code in a different directory from the compiled classes, then you should not have the source code in the Classpath. So, if you make sure the current directory is not e:\newjava\analysis\LDmeasure then it should compile.

Unused packages in import statement

Guyz,
Can anyone throw some light on this ?
Does using a lot of unused packages in import statement of a jsp affects its performance in terms of page loading ?
Thanks.

I have just found the answer for my question in another forum.
Please visit:
http://saloon.javaranch.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic&f=15&t=000240
Thanks.

Im trying to download itunes 10.5 but keep getting error message that says: There is a problem with this Windows Installer package. A problem run as part of the setup did not finish as expected. Contact your support personnel or package vendor.

im trying to download itunes 10.5 but keep getting error message that says: There is a problem with this Windows Installer package. A problem run as part of the setup did not finish as expected. Contact your support personnel or package vendor. I am using windows XP 32 bit, all the other computers in my house downloaded just fine, no problems, however this is the computer my iphone is set up to, ive tried doing a virus scan, windows update, downloading other things, updating everything possible, everything works fine, its just itunes that wont download, anyone have any other ideas?

Yes, I had found a similar solution also. I'm running XP Pro, SP3. I went Control Panels/ Add-Remove programmes/apple software update/ change/ repair. Then run the 10.5 exe.
While the programme updated from version 8 of iTunes, my new iTunes is now a mess. Not all of my music was in the same folder previously but it all showed up on iTunes. Now many albums have been left out, some have only a few tracks and some have two copies of some tracks as well as having other tracks missing. I haven't begun to work on that.

Program Problems...Import Statement needed?

I am currently a student at DeVry University, and today I had my java class where my professor played a video on java programming for us made by a group called "CBTNuggets". The video went over Inner classes and the professor had us copy the code as the person in the video was typing it up. While attempting to compile the code I encountered several compiler errors on the second of the two files I had typed, I am going to first post the source code for both files, and then follow that with the compiler errors that were generated when I attempted to compile the code. If anyone is able to assist me with this I would greatly appreciate it, I think I may need to add an import statement ;however, I do not know how to implement one for user defined Inner Classes:
Invoice.java was the file that contained the Inner classes
* Invoice.java
* Created on February 1, 2007, 1:39 PM
* To change this template, choose Tools | Template Manager
* and open the template in the editor.
* @author vontux
import java.util.*;
public class Invoice {
    private String strCustName;
    private String strCustAddr;
    private int intInvoiceNum;
    private Date dtInvoiceDate;
    /** Creates a new instance of Invoice */
   Invoice(String sCN, String sCA, int iN, Date dt)
       strCustName = sCN;
       strCustAddr = sCA;
       intInvoiceNum = iN;
       dtInvoiceDate = dt;
class InvoiceItem //enclosed class
      private int intLineItem;
      private int intItemID;
      private int intUnits;
      private String strItemDesc;
      InvoiceItem(int li, int id,String desc, int iu)
          intLineItem = li;
          intItemID = id;
          intUnits = iu;
          strItemDesc = desc;
      public void showInvoice()
          System.out.println("Customer Name: " + Invoice.this.strCustName);
          System.out.println("Item Description: " + strItemDesc);
}UseInvoice.java is the class that is supposed to create objects of the Inner classes from Invoice.java and then run the code:
* UseInvoice.java
* Created on February 1, 2007, 1:51 PM
* To change this template, choose Tools | Template Manager
* and open the template in the editor.
* @author vontux
import java.util.*;
public class UseInvoice {
    public static void main(String[] args)
        Date today = new Date();
        Invoice myInvoice = new Invoice("Robert Barrr", "12345 N. CBTNuggets Dr.", 321,today );
        Invoice.InvoiceItem myInvItem = myInvoice.new InvoiceItem(1, 345,"Toy Train", 2);
        myInvItem.showInvoice();
    /** Creates a new instance of UseInvoice */
    public UseInvoice() {
}And here are the compiler errors that I recieved:
C:\Documents and Settings\Matt\Desktop\temptemp\temp\UseInvoice.java:19: cannot
find symbol
symbol : class Invoice
location: class UseInvoice
        Invoice myInvoice = new Invoice("Robert Barrr", "12345 N. CBTNuggets Dr.
", 321,today );
        ^
C:\Documents and Settings\Matt\Desktop\temptemp\temp\UseInvoice.java:19: cannot
find symbol
symbol : class Invoice
location: class UseInvoice
        Invoice myInvoice = new Invoice("Robert Barrr", "12345 N. CBTNuggets Dr.
", 321,today );
                                ^
C:\Documents and Settings\Matt\Desktop\temptemp\temp\UseInvoice.java:20: package
Invoice does not exist
        Invoice.InvoiceItem myInvItem = myInvoice.new InvoiceItem(1, 345,"Toy Tr
ain", 2);
               ^
3 errors

There are no errors occurs when I compile this two java files .
Here are the result I'm using jdk1.6 and dos command
[output]
[search path for source files: [D:\J2SDK1.6.0\lib, .\out]]
[search path for class files: [D:\J2SDK1.6.0\jre\lib\resources.jar, D:\J2SDK1.6.0\jre\lib\rt.jar, D:\J2SDK1.6.0\jre\lib\sunrsasign.jar, D:\J2SDK1.6.0\jre\lib\jsse.jar, D:\J2SDK1.6.0\jre\lib\jce.jar, D:\J2SDK1.6.0\jre\lib\charsets.jar, D:\J2SDK1.6.0\jre\classes, D:\J2SDK1.6.0\jre\lib\ext\dnsns.jar, D:\J2SDK1.6.0\jre\lib\ext\localedata.jar, D:\J2SDK1.6.0\jre\lib\ext\sunjce_provider.jar, D:\J2SDK1.6.0\jre\lib\ext\sunmscapi.jar, D:\J2SDK1.6.0\jre\lib\ext\sunpkcs11.jar, D:\J2SDK1.6.0\lib, .\out]]
[parsing started .\Invoice.java]
[parsing completed 31ms]
[parsing started .\UseInvoice.java]
[parsing completed 15ms]
[loading D:\J2SDK1.6.0\lib\ct.sym(META-INF/sym/rt.jar/java/lang/Object.class)]
[loading D:\J2SDK1.6.0\lib\ct.sym(META-INF/sym/rt.jar/java/lang/String.class)]
[loading D:\J2SDK1.6.0\lib\ct.sym(META-INF/sym/rt.jar/java/util/Date.class)]
[checking Invoice]
[loading D:\J2SDK1.6.0\lib\ct.sym(META-INF/sym/rt.jar/java/lang/System.class)]
[loading D:\J2SDK1.6.0\lib\ct.sym(META-INF/sym/rt.jar/java/io/PrintStream.class)]
[loading D:\J2SDK1.6.0\lib\ct.sym(META-INF/sym/rt.jar/java/io/FilterOutputStream.class)]
[loading D:\J2SDK1.6.0\lib\ct.sym(META-INF/sym/rt.jar/java/io/OutputStream.class)]
[loading D:\J2SDK1.6.0\lib\ct.sym(META-INF/sym/rt.jar/java/io/Serializable.class)]
[loading D:\J2SDK1.6.0\lib\ct.sym(META-INF/sym/rt.jar/java/lang/StringBuilder.class)]
[loading D:\J2SDK1.6.0\lib\ct.sym(META-INF/sym/rt.jar/java/lang/AbstractStringBuilder.class)]
[loading D:\J2SDK1.6.0\lib\ct.sym(META-INF/sym/rt.jar/java/lang/CharSequence.class)]
[loading D:\J2SDK1.6.0\lib\ct.sym(META-INF/sym/rt.jar/java/lang/Comparable.class)]
[loading D:\J2SDK1.6.0\lib\ct.sym(META-INF/sym/rt.jar/java/lang/StringBuffer.class)]
[wrote .\out\Invoice$InvoiceItem.class]
[wrote .\out\Invoice.class]
[checking UseInvoice]
[loading D:\J2SDK1.6.0\lib\ct.sym(META-INF/sym/rt.jar/java/lang/Class.class)]
[wrote .\out\UseInvoice.class]
[total 734ms]
[output]
check your syntax to compile these two files, may be you can show your syntax to compile these two files
javac [options] [classpath] source

Java import statement memory problem

Hi,
will java.io.* loads all the classes in io package to the memory? will it afftect the program performance?

RajBabu wrote:
I hope that import statement might present in a java class fileNo, import statements are in no way represented in the java class files. All references to external classes are made via their fully quallified class names in a class file (com.foo.Bar and not just Bar*).
Imports only serve as a shortcut so that you don't have to write the full class name everywhere in your Source code. You could just as well write a program without using any import statements, just by using the fully qualified class names of each class you use and it would produce the same class files (although the source code would be rather unreadable).
* actually the format is different, but the idea is the same

Package scope and import statements

Hi everubody,
I'm studing a code: foo.java written by sb. else. In the code, I have:
package com.dir1.dir2.dir3;
import com.dir1.dir4.code1;
import com.dir1.dir5.code2;
The code: foo.java exists in the directory: com/dir1/dir2/dir3 as expected. However, in the import statements, there is NO dir4 and dir5 under com/dir1? Shouldn't the import statements be relative to the directory of package?
Guess I'm missing a point here... Any help is greatly apprecited.

When you import:
import co.mycompany.my.MyClass
then MyClass should reside in the directory:
co/mycompany/my, right?Right. Somewhere in the classpath there would have to be that directory structure. Again, that could be an actual directory name, or a path name in a Jar.
Then if the code: foo.java resides in the directory:
com/dir2/dir3 with the:
package com.dir1.dir2.dir3;
How the compiler and JVM finds the code MyClass
(which you imported in foo.java)?Thru the magic known as the classpath.

Problems with IMPORT STATEMENT

Please, can someone assist me? I am using Java Studio Enterprise 8.1 & Netbeans to design a java application and input form. But the wizard keeps on generating repeated class and subclasses even after I have used the import statement. Its making my program looks clumsy.
I just want to use import statement once and start using the variable in the program without repeating the declaration.
For instance, after importing javax.swing.*, I just want to be able to specify in my program (e.g JPanel Coylogo) without the wizard generating another private javax.swing.JPanel Coylogo.
How can I do it. Please help. I will appreciate
You look at the following section of the program to unstand what I mean. Thank you.
import java.awt.HeadlessException;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.sql.*;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import javax.swing.*;
import java.sql.Date;
* @author */
public class inputForm extends JFrame
private Connection con;
private Statement stmt;
private int k;
ResultSet rs=null;
// Variables declaration - do not modify
private javax.swing.JLabel ClassLabel;
private javax.swing.JPanel Connectivitypanel;
private javax.swing.JPanel Coylogo;
private javax.swing.JCheckBox DataCapable;
private javax.swing.JLabel DateLabel;
// End of variables declaration
* Creates new form inputForm
public inputForm()
//con = new dbConnect();
initComponents();
con = dbconnection();
/** This method is called from within the constructor to
* initialize the form.
* WARNING: Do NOT modify this code. The content of this method is
* always regenerated by the Form Editor.
// <editor-fold defaultstate="collapsed" desc=" Generated Code ">
private void initComponents()
Coylogo = new javax.swing.JPanel();
PhoneType = new javax.swing.JPanel();
PhoneIdLabel = new javax.swing.JLabel();
ClassLabel = new javax.swing.JLabel();
phoneid = new javax.swing.JTextField();
DateLabel = new javax.swing.JLabel();
Connectivitypanel.setBorder(javax.swing.BorderFactory.createTitledBorder("CONNECTIVITY"));
pbluetooth.setText("Bluetooth");
pbluetooth.setActionCommand("bluetooth");
pbluetooth.setBorder(javax.swing.BorderFactory.createEmptyBorder(0, 0, 0, 0));
pbluetooth.setHorizontalAlignment(javax.swing.SwingConstants.TRAILING);
pbluetooth.setHorizontalTextPosition(javax.swing.SwingConstants.LEFT);
pbluetooth.setMargin(new java.awt.Insets(0, 0, 0, 0));
}// </editor-fold>
private void allPhonesTypeActionPerformed(java.awt.event.ActionEvent evt)
}

disable add imports or organize imports in your IDE

Package-import statement problem: Part II

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