JSP cannot resolve symbol symbol: constructor ItemList
I get the following compilation error.
cannot resoolve symbol
symbol :constructor ItemList (java.sql.Connection,java.lang.String)
location: class ItemList
ItemList lst = new ItemList(conn."select * from Items ... );
-------I have the ItemList.java and .class files in the WEB-INF/classes directory. I am using Forte 4.0 CE.
-------My Code-----
<%@page contentType="text/html"%>
<%@page import="java.sql.*" %>
<--dbaccessItems.jsp-->
<html>
<head>
<title>Query Database</title>
</head>
<body>
<%
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection conn = DriverManager.getConnection("jdbc:odbc:Lecture5", "", "");
String max_price = request.getParameter("max_price");
ItemList lst = new ItemList(conn, "select * from Items where price < " + max_price + " ");
for (int i=0; i < lst.getItemCount(); i++)
Item itm = lst.getItem(i);
%>
<%= itm.getName() %>
<BR>
<TABLE Border=1>
<TR>
<TH>ID </TH>
<TH>Product Name</TH>
<TH>Quantity </TH>
<TH>Price </TH>
</TR>
<TR>
<TD> <% itm.getId(); %> </TD>
<TD> <% itm.getName(); %> </TD>
<TD> <% itm.getPrice(); %> </TD>
<TD> <% itm.getQty(); %> </TD>
</TR>
</TABLE>
<%
%>
<!--
0. Use pricesearch.html to enter "max price" if the item
1. Modify this JSP so it uses "max price" passed from pricesearch.html,
queries records from the database where price < "max price"
2. Displays item's id, name, price and qty formatted in the <TABLE>
-->
</body>
</html>
tt
Similar Messages
-
Java Bean Error in JSP: Cannot Resolve Symbol FirstBean
I have created a java bean with following package statement
package mybeans;
and my bean name is
FirstBean
it compile secessfully and now my directory structure is following
WebAppRootDir \ WEB-INF \ classes \ mybeans \ FirstBean.class
I am using Tomcat 4.1 and in JSP i am declaring the bean with following line
<jsp:useBean id="b" class="mybeans.FirstBean" />
and tomcat 4.1 is failed to find this bean and giving me following error
cannot resolve symbol
symbol : class StudentBean
location: package mybeans
mybeans.FirstBean b = null;
all my class and directory structure is ok i am puzzle why this error is coming, plz help me quickly i need solution quickly ...Error is for StudentBean, not for FirstBean. So check for it.
-
Java Bean Error in JSP: Cannot Resolve Symbol Error
I have created a java bean with following package statement
package mybeans;
and my bean name is
FirstBean
it compile secessfully and now my directory structure is following
WebAppRootDir \ WEB-INF \ classes \ mybeans \ FirstBean.class
I am using Tomcat 4.1 and in JSP i am declaring the bean with following line
<jsp:useBean id="b" class="mybeans.FirstBean" />
and tomcat 4.1 is failed to find this bean and giving me following error
cannot resolve symbol
symbol : class FirstBean
location: package mybeans
mybeans.FirstBean b = null;
all my class and directory structure is ok i am puzzle why this error is coming, plz help me quickly i need solution quickly ...It seem to be ok... why dont your try with a newer versi�n of Tomcat?
-
"cannot resolve symbol" in a Timer !!!Please Help!!!
I am doing a program for a class which involves timers. I am using JCreator and when i try to construct a new timer, the compiler points to the "new" in the line:
Timer T1=new Timer(interval, ActionListener);
^
This is what it looks like and the error reads: cannot resolve symbol; constructor Timer.
please tell me if yiou have any information or suggestions as to how this error might be remedied.Sure, here it is:
import java.awt.event.*;
import javax.swing.Timer;
import javax.swing.JOptionPane;
import java.util.*;
interface ActionListener
void actionPerformed(ActionEvent event);
class Ploid
public static void main(String[] args)
class Car implements ActionListener
int mpg=30;
int mph=35;
int gtank=20;
int interval;
int changer;
int totalmiles;
Car(int x)
interval=x;
public void actionPerformed(ActionEvent event)
for(int c=0;c<(interval/1000);c++)
totalmiles=totalmiles+mph;
int hyt=mpg*gtank;
if(totalmiles>hyt)
int y=totalmiles-hyt;
totalmiles=totalmiles-y;
System.out.println(totalmiles);
else
System.out.println(totalmiles);
class SUV implements ActionListener
int mpg=15;
int mph=55;
int gtank=30;
int interval;
int changer;
int totalmiles;
SUV(int x)
interval=x;
public void actionPerformed(ActionEvent event)
for(int c=0;c<(interval/1000);c++)
totalmiles=totalmiles+mph;
int hyt=mpg*gtank;
if(totalmiles>hyt)
int y=totalmiles-hyt;
totalmiles=totalmiles-y;
System.out.println(totalmiles);
else
System.out.println(totalmiles);
class Semi implements ActionListener
int mpg=60;
int mph=80;
int gtank=50;
int interval;
int changer;
int totalmiles;
Semi(int x)
interval=x;
public void actionPerformed(ActionEvent event)
for(int c=0;c<(interval/1000);c++)
totalmiles=totalmiles+mph;
int hyt=mpg*gtank;
if(totalmiles>hyt)
int y=totalmiles-hyt;
totalmiles=totalmiles-y;
System.out.println(totalmiles);
else
System.out.println(totalmiles);
String flag="y";
String trav=JOptionPane.showInputDialog("How long do you want to drive?(1000=1 hour)");
int t1=Integer.parseInt(trav);
Car listen=new Car(t1);
SUV listener2=new SUV(t1);
Semi listener3=new Semi(t1);
final int t2=t1/1000;
final int t3=t1/t2;
ActionListener listener=null;
Timer T1=new Timer(t3, listener);
Timer T2=new Timer(t3, listener);
Timer T3=new Timer(t3, listener);
while(flag.equals("y"))
T1.start();
T2.start();
T3.start();
String g=JOptionPane.showInputDialog("Do you want to drive again?");
if((g.equals("y"))||(g.equals("Y")))
System.out.println("Let's Drive!");
else
flag=g;
System.exit(0);
}Here is the errors:
[errors]
A:\Ploid2.java:116: cannot resolve symbol
symbol : constructor Timer (int,ActionListener)
location: class javax.swing.Timer
Timer T1=new Timer(t3, listener);
^
A:\Ploid2.java:117: cannot resolve symbol
symbol : constructor Timer (int,ActionListener)
location: class javax.swing.Timer
Timer T2=new Timer(t3, listener);
^
A:\Ploid2.java:118: cannot resolve symbol
symbol : constructor Timer (int,ActionListener)
location: class javax.swing.Timer
Timer T3=new Timer(t3, listener);
^
3 errors
Process completed.
[errors]
****There is the source code and the errors the compiler returns. That should be more help.**** -
JSP page "cannot resolve symbol"
Hi,
I'm using j2sdk1.4.2_01 and tomcat-5.0.13. I'm developing within Eclipse 3.0.0 with the Tomcat plugin.
In my project ("Agenda2") i only created one class ("Persona"), that is correctely compiled (%TOMCAT_HOME%\webapps\Agenda2\WEB-INF\src\Persona.java results in %TOMCAT_HOME%\webapps\Agenda2\WEB-INF\classes\Persona.class, and 0 problems are shown in the Problems list.
In %TOMCAT_HOME%\webapps\Agenda2 i have my Edit.jsp, that begins with these lines:
<%@ page language="java" contentType="text/html" %>
<HTML>
<HEAD>
<TITLE>Edit</TITLE>
</HEAD>
<BODY>
<jsp:useBean id="personaAtt" class="Persona">
<jsp:setProperty name="personaAtt" property="*" />
</jsp:useBean>
....When i call the JSP from the browser, i get this error:
org.apache.jasper.JasperException: Unable to compile class for JSP
An error occurred at line: 8 in the jsp file: /Edit.jsp
Generated servlet error:
[javac] Compiling 1 source file
C:\Programmi\Java\tomcat-5.0.13\webapps\Agenda2\work\org\apache\jsp\Edit_jsp.java:48: cannot resolve symbol
symbol : class Persona
location: class org.apache.jsp.Edit_jsp
Persona personaAtt = null;
^The error message mentions line 8, which is the one following <BODY>, that is
<jsp:useBean id="personaAtt" class="Persona">My impression is that there is some path problem, but despite my tries i can't get it.
The folders tree under %TOMCAT_HOME%\webapps\Agenda2\ is:
-WEB-INF
--classes
--lib
--src
-work
--org
---apache
----jspDoes anybody can see the problem ?Thanks! I'm going to try to put the class into a package as both you have suggested, and i'll post here the result.
In the meantime i have a related newbie question:
putting the class into a package, is this kind of a workaround, or it's the "normal thing" ?
I mean, is it mandatory to put classes into a package in order to import them from JSP pages ?
It was my understanding that it isn't mandatory, but - from your replies and many other posts in this forum - i'm starting to think that i'm wrong. -
JSP Compilation Problem - Cannot Resolve Symbol
I cannot see the problem. Maybe I am not sober at 2:30 am.
<%
Collection postBeans = ( Collection )request.getAttribute( "PostBeans" );
Iterator iterator = postBeans.iterator();
int i = 0;
while( iterator.hasNext() )
PostBean postBean = (PostBean)iterator.next();
i++;
String background;
if ( postBean.getParentPostID() == 0 )
background = "#FFCE9C";
else
if ( ( i%2 ) != 0 )
background = "#EEEEEE";
else
background = "#FFFFFF";
%>
<table width="95%" border="0" cellspacing="1" cellpadding="5" align="center" bgcolor="#999999">
<tr bgColor=<%=background%>>
</tr>
</table>I got compilation error: cannot resolve symbol
symbol: backgroundI put the variable 'background' outside the while loop. The 'cannot resolve symbol' problem is gone. But, I got another compilation error:
>
unexpected type
required: variable
found : value
out.write("\r\n }\r\n i++;\r\n if ( postBean.getParentPostID() == 0 ) \r\n {\r\n background = \"#FFCE9C\";\r\n }\r\n else \r\n {\r\n if ((i%2) != 0) \r\n {\r\n background = \"#EEEEEE\";\r\n } \r\n else \r\n {\r\n background = \"#FFFFFF\";\r\n }\r\n }\r\n%>\r\n");
The code looks like:
<%
String background;
Collection postBeans = ( Collection )request.getAttribute( "PostBeans" );
Iterator iterator = postBeans.iterator();
int i = 0;
while( iterator.hasNext() )
PostBean postBean = (PostBean)iterator.next();
i++;
if ( postBean.getParentPostID() == 0 )
background = "#FFCE9C";
else
if ( ( i%2 ) != 0 )
background = "#EEEEEE";
else
background = "#FFFFFF";
%>
<table width="95%" border="0" cellspacing="1" cellpadding="5" align="center" bgcolor="#999999">
<tr bgColor=<%=background%>>
</tr>
</table> -
Getting error message Cannot Resolve Symbol when trying to compile a class
Hello All -
I am getting an error message cannot resolve symbol while trying to compile a java class that calls another java class in the same package. The called class compiles fine, but the calling class generates
the following error message:
D:\Apache Tomcat 4.0\webapps\examples\WEB-INF\classes\cal>javac
ConnectionPool.java
ConnectionPool.java:158: cannot resolve symbol
symbol : class PooledConnection
location: class cal.ConnectionPool
private void addConnection(PooledConnection value) {
^
ConnectionPool.java:144: cannot resolve symbol
symbol : class PooledConnection
location: class cal.ConnectionPool
PooledConnection pcon = new PooledConnection(con);
^
ConnectionPool.java:144: cannot resolve symbol
symbol : class PooledConnection
location: class cal.ConnectionPool
PooledConnection pcon = new PooledConnection(con);
The code is listed as follows for PooledConnection.java (it compiles fine)
package cal;
import java.sql.*;
public class PooledConnection {
// Real JDBC Connection
private Connection connection = null;
// boolean flag used to determine if connection is in use
private boolean inuse = false;
// Constructor that takes the passed in JDBC Connection
// and stores it in the connection attribute.
public PooledConnection(Connection value) {
if ( value != null ) {
connection = value;
// Returns a reference to the JDBC Connection
public Connection getConnection() {
// get the JDBC Connection
return connection;
// Set the status of the PooledConnection.
public void setInUse(boolean value) {
inuse = value;
// Returns the current status of the PooledConnection.
public boolean inUse() {
return inuse;
// Close the real JDBC Connection
public void close() {
try {
connection.close();
catch (SQLException sqle) {
System.err.println(sqle.getMessage());
Now the code for ConnectionPool.java class that gives the cannot
resolve symbol error
package cal;
import java.sql.*;
import java.util.*;
public class ConnectionPool {
// JDBC Driver Name
private String driver = null;
// URL of database
private String url = null;
// Initial number of connections.
private int size = 0;
// Username
private String username = new String("");
// Password
private String password = new String("");
// Vector of JDBC Connections
private Vector pool = null;
public ConnectionPool() {
// Set the value of the JDBC Driver
public void setDriver(String value) {
if ( value != null ) {
driver = value;
// Get the value of the JDBC Driver
public String getDriver() {
return driver;
// Set the URL Pointing to the Datasource
public void setURL(String value ) {
if ( value != null ) {
url = value;
// Get the URL Pointing to the Datasource
public String getURL() {
return url;
// Set the initial number of connections
public void setSize(int value) {
if ( value > 1 ) {
size = value;
// Get the initial number of connections
public int getSize() {
return size;
// Set the username
public void setUsername(String value) {
if ( value != null ) {
username = value;
// Get the username
public String getUserName() {
return username;
// Set the password
public void setPassword(String value) {
if ( value != null ) {
password = value;
// Get the password
public String getPassword() {
return password;
// Creates and returns a connection
private Connection createConnection() throws Exception {
Connection con = null;
// Create a Connection
con = DriverManager.getConnection(url,
username, password);
return con;
// Initialize the pool
public synchronized void initializePool() throws Exception {
// Check our initial values
if ( driver == null ) {
throw new Exception("No Driver Name Specified!");
if ( url == null ) {
throw new Exception("No URL Specified!");
if ( size < 1 ) {
throw new Exception("Pool size is less than 1!");
// Create the Connections
try {
// Load the Driver class file
Class.forName(driver);
// Create Connections based on the size member
for ( int x = 0; x < size; x++ ) {
Connection con = createConnection();
if ( con != null ) {
// Create a PooledConnection to encapsulate the
// real JDBC Connection
PooledConnection pcon = new PooledConnection(con);
// Add the Connection to the pool.
addConnection(pcon);
catch (Exception e) {
System.err.println(e.getMessage());
throw new Exception(e.getMessage());
// Adds the PooledConnection to the pool
private void addConnection(PooledConnection value) {
// If the pool is null, create a new vector
// with the initial size of "size"
if ( pool == null ) {
pool = new Vector(size);
// Add the PooledConnection Object to the vector
pool.addElement(value);
public synchronized void releaseConnection(Connection con) {
// find the PooledConnection Object
for ( int x = 0; x < pool.size(); x++ ) {
PooledConnection pcon =
(PooledConnection)pool.elementAt(x);
// Check for correct Connection
if ( pcon.getConnection() == con ) {
System.err.println("Releasing Connection " + x);
// Set its inuse attribute to false, which
// releases it for use
pcon.setInUse(false);
break;
// Find an available connection
public synchronized Connection getConnection()
throws Exception {
PooledConnection pcon = null;
// find a connection not in use
for ( int x = 0; x < pool.size(); x++ ) {
pcon = (PooledConnection)pool.elementAt(x);
// Check to see if the Connection is in use
if ( pcon.inUse() == false ) {
// Mark it as in use
pcon.setInUse(true);
// return the JDBC Connection stored in the
// PooledConnection object
return pcon.getConnection();
// Could not find a free connection,
// create and add a new one
try {
// Create a new JDBC Connection
Connection con = createConnection();
// Create a new PooledConnection, passing it the JDBC
// Connection
pcon = new PooledConnection(con);
// Mark the connection as in use
pcon.setInUse(true);
// Add the new PooledConnection object to the pool
pool.addElement(pcon);
catch (Exception e) {
System.err.println(e.getMessage());
throw new Exception(e.getMessage());
// return the new Connection
return pcon.getConnection();
// When shutting down the pool, you need to first empty it.
public synchronized void emptyPool() {
// Iterate over the entire pool closing the
// JDBC Connections.
for ( int x = 0; x < pool.size(); x++ ) {
System.err.println("Closing JDBC Connection " + x);
PooledConnection pcon =
(PooledConnection)pool.elementAt(x);
// If the PooledConnection is not in use, close it
if ( pcon.inUse() == false ) {
pcon.close();
else {
// If it is still in use, sleep for 30 seconds and
// force close.
try {
java.lang.Thread.sleep(30000);
pcon.close();
catch (InterruptedException ie) {
System.err.println(ie.getMessage());
I am using Sun JDK Version 1.3.0_02" and Apache/Tomcat 4.0. Both the calling and the called class are in the same directory.
Any help would be greatly appreciated.
tnx..
addiIs ConnectionPool in this "cal" package as well as PooledConnection? From the directory you are compiling from it appears that it is. If it is, then you are compiling it incorrectly. To compile ConnectionPool (and PooledConnection similarly), you must change the current directory to the one that contains cal and type
javac cal/ConnectionPool. -
Class error - cannot resolve symbol "MyDocumentListener"
Hello,
this is a groaner I'm sure, but I don't see the problem.
Newbie-itis probably ...
I'm not concerned with what the class does, but it would be nice for the silly thing to compile!
What the heck am I missing for "MyDocumentListener" ?
C:\divelog>javac -classpath C:\ CenterPanel.java
CenterPanel.java:53: cannot resolve symbol
symbol : class MyDocumentListener
location: class divelog.CenterPanel
MyDocumentListener myDocumentListener = new MyDocumentListener(); // define the listener class
^
CenterPanel.java:53: cannot resolve symbol
symbol : class MyDocumentListener
location: class divelog.CenterPanel
MyDocumentListener myDocumentListener = new MyDocumentListener(); // define the listener class
^
2 errors
package divelog;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.lang.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.filechooser.*;
import javax.swing.text.*;
public class CenterPanel extends JPanel implements ActionListener
{ // Opens class
static private final String newline = "\n";
private JTextArea comments;
private JScrollPane scrollpane;
private JButton saveButton, openButton;
private JLabel whiteshark;
private Box box;
private BufferedReader br ;
private String str;
private JTextArea instruct;
private File defaultDirectory = new File("C://divelog");
private File fileDirectory = null;
private File currentFile= null;
public CenterPanel()
{ // open constructor CenterPanel
setBackground(Color.white);
comments = new JTextArea("Enter comments, such as " +
"location, water conditions, sea life you observed," +
" and problems you may have encountered.", 15, 10);
comments.setLineWrap(true);
comments.setWrapStyleWord(true);
comments.setEditable(true);
comments.setFont(new Font("Times-Roman", Font.PLAIN, 14));
// add a document listener for changes to the text,
// query before opening a new file to decide if we need to save changes.
MyDocumentListener myDocumentListener = new MyDocumentListener(); // define the listener class
comments.getDocument().addDocumentListener(myDocumentListener); // create the reference for the class
// ------ Document listener class -----------
class MyDocumentListener implements DocumentListener {
public void insertUpdate(DocumentEvent e) {
Calculate(e);
public void removeUpdate(DocumentEvent e) {
Calculate(e);
public void changedUpdate(DocumentEvent e) {
private void Calculate(DocumentEvent e) {
// do something here
scrollpane = new JScrollPane(comments);
scrollpane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
saveButton = new JButton("Save Comments", new ImageIcon("images/Save16.gif"));
saveButton.addActionListener( this );
saveButton.setToolTipText("Click this button to save the current file.");
openButton = new JButton("Open File...", new ImageIcon("images/Open16.gif"));
openButton.addActionListener( this );
openButton.setToolTipText("Click this button to open a file.");
whiteshark = new JLabel("", new ImageIcon("images/gwhite.gif"), JLabel.CENTER);
Box boxH;
boxH = Box.createHorizontalBox();
boxH.add(openButton);
boxH.add(Box.createHorizontalStrut(15));
boxH.add(saveButton);
box = Box.createVerticalBox();
box.add(scrollpane);
box.add(Box.createVerticalStrut(10));
box.add(boxH);
box.add(Box.createVerticalStrut(15));
box.add(whiteshark);
add(box);
} // closes constructor CenterPanel
public void actionPerformed( ActionEvent evt )
{ // open method actionPerformed
JFileChooser jfc = new JFileChooser();
// these do not work !!
// -- set the file types to view --
// ExtensionFileFilter filter = new ExtensionFileFilter();
// FileFilter filter = new FileFilter();
//filter.addExtension("java");
//filter.addExtension("txt");
//filter.setDescription("Text & Java Files");
//jfc.setFileFilter(filter);
//Add a custom file filter and disable the default "Accept All" file filter.
jfc.addChoosableFileFilter(new JTFilter());
jfc.setAcceptAllFileFilterUsed(false);
// -- open the default directory --
// public void setCurrentDirectory(File dir)
// jfc.setCurrentDirectory(new File("C://divelog"));
jfc.setCurrentDirectory(defaultDirectory);
jfc.setSize(400, 300);
jfc.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
Container parent = saveButton.getParent();
//========================= Test Button Actions ================================
//========================= Open Button ================================
if (evt.getSource() == openButton)
int choice = jfc.showOpenDialog(CenterPanel.this);
File file = jfc.getSelectedFile();
/* a: */
if (file != null && choice == JFileChooser.APPROVE_OPTION)
String filename = jfc.getSelectedFile().getAbsolutePath();
// -- compare the currentFile to the file chosen, alert of loosing any changes to currentFile --
// If (currentFile != filename)
// -- get the current directory name -------
// public File getCurrentDirectory( );
File f=new File(System.getProperty("user.dir"));
fileDirectory = jfc.getCurrentDirectory();
// -- remember the last directory used --
if (defaultDirectory != fileDirectory)
{defaultDirectory = fileDirectory;}
try
{ //opens try
comments.getLineCount( );
// -- clear the old data before importing the new file --
comments.selectAll();
comments.replaceSelection("");
// -- get the new data ---
br = new BufferedReader (new FileReader(file));
while ((str = br.readLine()) != null)
{//opens while
comments.append(str);
} //closes while
} // close try
catch (IOException ioe)
{ // open catch
comments.append(newline +"Open command not successful:" + ioe + newline);
} // close catch
// ---- display the values of the directory variables -----------------------
comments.append(
newline + "The f directory variable contains: " + f +
newline + "The fileDirectory variable contains: " + fileDirectory +
newline + "The defaultDirectory variable contains: " + defaultDirectory );
else
comments.append("Open command cancelled by user." + newline);
} //close if statement /* a: */
//========================= Save Button ================================
} else if (evt.getSource() == saveButton)
int choice = jfc.showSaveDialog(CenterPanel.this);
if (choice == JFileChooser.APPROVE_OPTION)
File fileName = jfc.getSelectedFile();
// -- get the current directory name -------
// public File getCurrentDirectory( );
File f=new File(System.getProperty("user.dir"));
fileDirectory = jfc.getCurrentDirectory();
// -- remember the last directory used --
if (defaultDirectory != fileDirectory)
{defaultDirectory = fileDirectory;}
//check for existing files. Warn users & ask if they want to overwrite
for(int i = 0; i < fileName.length(); i ++) {
File tmp = null;
tmp = (fileName);
if (tmp.exists()) // display pop-up alert
//public static int showConfirmDialog( Component parentComponent,
// Object message,
// String title,
// int optionType,
// int messageType,
// Icon icon);
int confirm = JOptionPane.showConfirmDialog(null,
fileName + " already exists on " + fileDirectory
+ "\n \nContinue?", // msg
"Warning! Overwrite File!", // title
JOptionPane.OK_CANCEL_OPTION, // buttons displayed
// JOptionPane.ERROR_MESSAGE
// JOptionPane.INFORMATION_MESSAGE
// JOptionPane.PLAIN_MESSAGE
// JOptionPane.QUESTION_MESSAGE
JOptionPane.WARNING_MESSAGE,
null);
if (confirm != JOptionPane.YES_OPTION)
{ //user cancels the file overwrite.
try {
jfc.cancelSelection();
break;
catch(Exception e) {}
// ----- Save the file if everything is OK ----------------------------
try
{ // opens try
BufferedWriter bw = new BufferedWriter(new FileWriter(fileName));
bw.write(comments.getText());
bw.flush();
bw.close();
comments.append( newline + newline + "Saving: " + fileName.getName() + "." + newline);
break;
} // closes try
catch (IOException ioe)
{ // open catch
comments.append(newline +"Save command unsuccessful:" + ioe + newline);
} // close catch
} // if exists
} //close for loop
else
comments.append("Save command cancelled by user." + newline);
} // end-if save button
} // close method actionPerformed
} //close constructor CenterPanel
} // Closes class CenterPanelThere is no way to be able to see MyDocumentListener class in the way you wrote. The reason is because MyDocumentListener class inside the constructor itself. MyDocumentListener class is an inner class, not suppose to be inside a constructor or a method. What you need to do is simple thing, just move it from inside the constructor and place it between two methods.
that's all folks
Qusay -
BufferedReader cannot resolve symbol
Hi,
I need some help with a java program which reads xml files to a specified location, running it on a UNIX machine using Java 1.4.1. I modified the code to include the BufferedReader class, but it keeps complaining about not being able to resolve symbol at line 50 & 53. Any help here would be appreciated, since I'm a newbie.
bash-2.05$ javac outputScript.java
outputScript.java:50: cannot resolve symbol
symbol : constructor InputStreamReader (java.lang.String)
location: class java.io.InputStreamReader
BufferedReader in = new BufferedReader(new InputStreamReader("in"));
^
outputScript.java:53: cannot resolve symbol
symbol : method available ()
location: class java.io.BufferedReader
while (in.available() !=0)
Here's the code:
//package cognos8_3;
import java.io.*;
import java.io.InputStreamReader;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.File;
* outputScript.java
* Copyright Cognos Incorporated. All Rights Reserved.
* Cognos and the Cognos logo are trademarks of Cognos Incorporated.
* Description: (KB 1013700) - Sample script that will rename output files generated by CM.OUTPUTLOCATION - Cognos 8.3
class outputScript
public static void main(String args[])
String reportName = "";
String reportViewName = "";
String outputLocation = "/data/cognos/rn_filecp/";
String defName = "";
String ofTime = "";
String burstKey = "";
int countRenamed = 0;
// get the list of desc files in the outputlocation
File descFiles = new File(outputLocation);
String[] children = descFiles.list();
if (children == null || children.length == 0)
System.out.println("Invalid file location or no reports found to rename.");
else
System.out.println("Found " + children.length + " files in this location, search for file names containing '_desc.'.");
for (int i=0; i<children.length; i++)
try
// Get filename of file or directory
String filename = children;
if (filename.indexOf("_desc.")>=0)
// Open the file that is the first
// command line parameter
FileInputStream fstream = new FileInputStream(outputLocation+filename);
FileInputStream bis = new FileInputStream(fstream);
BufferedReader in = new BufferedReader(new InputStreamReader("bis.in"));
// Continue to read lines while there are still some left to read
while (in.available() !=0)
String temp = in.readLine();
System.out.println(temp);
// check for report name
if (temp.indexOf("report[@name=")>0)
// get beginning of name
int startIndex = temp.indexOf("report[@name='");
String startString;
int endIndex = 0;
if (startIndex > 0)
startString = temp.substring(startIndex);
startIndex = startString.indexOf("'") + 5; //' 6 characters
endIndex = startString.lastIndexOf("'");
else
startIndex = temp.indexOf("report[@name=");
startString = temp.substring(startIndex);
startIndex = startString.indexOf("@name=") + 6; //' 6 characters
endIndex = startString.lastIndexOf("]");
// get report name
reportName = startString.substring(startIndex+1, endIndex);
//System.out.println("Found report name - " + reportName);
else if (temp.indexOf("reportView[@name=")>0)
// get beginning of name
int startIndex = temp.indexOf("reportView[@name='");
String startString;
int endIndex = 0;
if (startIndex > 0)
startString = temp.substring(startIndex);
startIndex = startString.indexOf("'") + 5; //' 6 characters
endIndex = startString.lastIndexOf("'");
else
startIndex = temp.indexOf("reportView[@name=");
startString = temp.substring(startIndex);
startIndex = startString.indexOf("@name=") + 6; //' 6 characters
endIndex = startString.lastIndexOf("]");
// get report name
reportViewName = startString.substring(startIndex+1, endIndex);
//System.out.println("Found reportView name - " + reportViewName);
else if (temp.indexOf("</fileName>")>0) //check for default name
defName = temp.substring(temp.indexOf(">")+1, temp.lastIndexOf("<"));
else if (temp.indexOf("asOfTime")>=0) // get the time to assure uniqueness when saving
ofTime = temp.substring(temp.indexOf(">")+1, temp.lastIndexOf("<"));
// clean colons from time
ofTime = ofTime.replaceAll(":","_");
else if (temp.indexOf("</burstKey>")>=0)
burstKey = temp.substring(temp.indexOf(">")+1, temp.lastIndexOf("<"));
in.close();
if (reportName.length() == 0)
reportName = reportViewName;
//System.out.println("Renaming using view name - no report name found");
String format = defName.substring(defName.length()-3, defName.length());
// new description xml file
File file = new File(outputLocation+filename);
File newDescFile = new File(outputLocation + reportName+"_"+burstKey+"_"+ofTime+"DESC_" + format+ ".xml");
// new renamed specific format file.
File file3 = new File(outputLocation+defName);
File newDefFile = new File(outputLocation + reportName+"_"+burstKey+"_"+ofTime+"."+format);
boolean success = file3.renameTo(newDefFile);
if (!success)
// File was not successfully renamed
System.out.println("ERROR attempting to rename - " + file3.getAbsolutePath() + " to \n\t\t" +
newDefFile.getAbsolutePath());
else
countRenamed++;
// File was successfully renamed
System.out.println(countRenamed +") Renamed - " + file3.getAbsolutePath() + " to \n\t\t" +
newDefFile.getAbsolutePath());
// Rename file (or directory)
success = file.renameTo(newDescFile);
if (!success)
// File was not successfully renamed
System.out.println("ERROR attempting to rename - " + file.getAbsolutePath() + " to \n\t\t" +
newDescFile.getAbsolutePath());
else
// File was successfully renamed
System.out.println(" - " + file.getAbsolutePath() + " to \n\t\t" +
newDescFile.getAbsolutePath());
catch (Exception e)
System.err.println("File input error " + e.getMessage()) ;
System.out.println("Complete.");
Thanks,
Nick
Edited by: nickmills on Aug 31, 2008 5:05 PMFirst, you only need to create the FileInputStream once. Then that's what you pass to the InputStreamReader constructor. Your code for reading from the BufferedReader is also wrong.FileInputStream fstream = new FileInputStream(outputLocation+filename);
// FileInputStream bis = new FileInputStream(fstream); <-- remove this line
BufferedReader in = new BufferedReader(new InputStreamReader(fstream));
// available() doesn't do what you think it does; forget about it.
// Here's the standard way to use a BufferedReader
String line = null;
while ((line = in.readLine()) != null)
// process 'line'
} There are probably other errors in the code, but reading all that unformatted code is too much of a hassle. In future, please use {code} tags when posting source code. -
Weird cannot resolve symbol error.
I'm having a problem with the most simple thing, but I really don't know what is th error, maybe I can�t see the error because the lack of rest.
I have two classes, both are in a package and in the same folder.
This is are the problematic lines.
tmpLong = calculateSizeFile("sonido.wav");
tmpInt = calculateSizeSegment("sonido.wav");
SendFile file1 = new SendFile(args[0], "sonido.wav", 2, 32, 2, 2, tmpLong, tmpInt);
The SendFile is the other class and it�s a thread.
The package decalaration is:
package com.sigmatao.gde.batch;
This is the constructor of the other class:
public SendFile(String httpServlet, String file, int numberRetry, int maxTimeWait,int multiplier,int timeMin, long sizeFileToSend, int sizeSegmentFile)
Thanks in advanced for the help.C:\Temp\URL\com\sigmatao\gde\batch>javac BatchTransfer.java
BatchTransfer.java:20: cannot resolve symbol
symbol : class SendFile
location: class com.sigmatao.gde.batch.BatchTransfer
SendFile file1 = new SendFile(args[0], "sonido.wav", 2, 32, 2, 2, tmpLon
g, tmpInt);
^
BatchTransfer.java:20: cannot resolve symbol
symbol : class SendFile
location: class com.sigmatao.gde.batch.BatchTransfer
SendFile file1 = new SendFile(args[0], "sonido.wav", 2, 32, 2, 2, tmpLon
g, tmpInt);
This is the problem. -
Compiler error cannot resolve symbol
Hi people,
i'm having this compile time error that, when i create a class and calling that class in another class gives the error cannot resolve symbol classname and it also happened when i created a bean and referencing the bean class in another bean when i'm using Jsp. thanks in advance.It would be helpful if you post the exact error message. If you use a system Classpath, then it must contain the root directory for the package directory(s).
For example, if the source code for a file starts with
package my.package;
and you have a directory structure c:\myjava\classes\my\package then the Classpath must contain c:\myjava\classes. -
Cannot resolve symbol dropdown1 from the tutorial
Has anyone a clue to why javac won't compile the button action. I looks like it can't find the dropdown1 droplist despite the fact that it is visible in the gui editor.
here is my offending code:
String name=(String)dropdown1.getValue();
And the error code:
untitled\Page1.java [76] cannot resolve symbol
symbol : variable dropdown1
location: class untitled.Page1
String name=(String)dropdown1.getValue();Sounds like a bug.
I'm sure the engineering team would love to have some more info on this. Can you file a bug here:
http://developers.sun.com/prodtech/javatools/jscreator/bugreport.jsp
From my experience, they are taken very seriously and if it's already filed and has workaround, it'll be sent to you.
For sending the source code, I'm simply meant pasting it into the message box (using eventually formatting (see "code" button).
thanks,
-Alexis -
Cannot resolve symbol error while trying to define methods in a class
Well, I'm fairly new to java and I'm trying to write a simple program that will take user input for up to 100 die and how many sides they have and will then roll them and output the frequencies of numbers occuring. I have overloaded the constructor for the Die class to reflect different choices the user may have when initializing the Die.
Here is my code:import java.util.*;
import java.io.*;
public class Die
private final int MIN_FACES = 4;
private int numFaces;
private int i = 0;
private int faceValue;
private Die currentDie;
private BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
private String line = null;
public Die()
numFaces = 6;
faceValue = 1;
public Die (int faces)
if (faces < MIN_FACES) {
numFaces = 6;
System.out.println ("Minimum number of faces allowed is 6.");
System.out.println ("Setting faces to 6... . . . . . . . . .");
else
numFaces = faces;
faceValue = 1;
//Returns an array of Die Objects
public Die (int num_die, int faces)
numFaces = faces;
Die[] protoDie = new Die[num_die];
for (i = 0; i <= num_die-1; i++)
Die currentDie = new Die(numFaces);
protoDie = protoDie.initMultiDie(currentDie, i);
public Die (double num_die)
int numberOfDie = (int) num_die;
Die[] protoDie = new Die[numberOfDie];
System.out.print ("Enter the number of sides for die #" + i);
for (i=0; i <= protoDie.length; i++) {
do {
try {
line = br.readLine();
numFaces = Integer.parseInt(line);
catch (NumberFormatException nfe) {
System.out.println ("You must enter an integer.");
System.out.print ("Setting number of dice to 0, please reenter: ");
if (numFaces < 0) {
System.out.println ("The number of sides must be positive.");
numFaces *= -1;
System.out.println ("Number of sides is: " + numFaces);
else
if (numFaces = 0) {
System.out.println ("Zero dice is no fun. =[");
System.out.print ("Please reenter the number of sides: ");
numFaces = 0;
while (numFaces == 0);
Die currentDie = new Die(numFaces);
protoDie[i] = protoDie.initMultiDie(currentDie, i);
i = 0;
public Die[] initMultiDie (Die[] protoDie, Die currentDie, int i)
protoDie[i] = currentDie;
return protoDie;
public Die reInit (int sides)
currentDie.roll();
return currentDie;
public int roll()
faceValue = (int) (Math.random() * numFaces) + 1;
return faceValue;
}When I compile I get 2 errors at lines 42 and 73 saying:
Cannot resolve symbol | symbol: method initMultiDie(Die, int) | location: class Die[] | protoDie[i] = protoDie.initMultiDie(currentDie, i)
I've tried mixing things up with invoking the method, such as including protoDie in the parameter liist, instead of invoking the initMultiDie method thru the protoDie Die[] object. I'm a little confused as to what I can and cannot do with defining arrays of Objects like Die. Thank you for any input you may be able to provide.
~LijeI may as well just replace Die with Dice and allow
Dice to represent a collection of 1 die.. I just like
to cut on bloat and make my programs be as efficient
as possible.Efficiency and avoiding code bloat are good goals, but you don't necessarily achieve it by creating the smallest number of classes. If you have N algorithms in M lines, then you have that many, regardless of whether they're in one class or two. A really long source file can be a worse example of bloat than two source files of half the size -- it can be harder to read, less clear in the design, and thus with more bugs...
The important thing is clarity and a strong design.
The weird thing is, that initMultiDie is
what seems to be throwing up the error, but I don't
see why. Meh, I'm sure I'll figure it out.Refactoring a class to make the design more transparent often helps you figure out bugs. -
Cannot resolve symbol: method getCodeBase ()
I`m creating a dice game that makes a sound when player wins or looses. Instaed I`m getting the following error message: Cannot resolve symbol: method getCodeBase (). I think this depends on the fact that I have a separate applet launcher but cannot figure out how to solve this, please help!!
This is the applet launcher
import javax.swing.*;
import java.awt.*;
// [MC] Public class DiceApplet
public class DiceApplet extends JApplet
// [MC] Constructor.
public DiceApplet()
// [MC] Sets the contentPane property. This method is called by the constructor.
this.setContentPane(new DicePanel());
This is the die class
import java.awt.*;
import javax.swing.*;
// [MC] Public class Die
public class Die extends JPanel
// ======================================================================
// [MC] Instance variable.
private int myFaceValue; // [MC] Value that shows on face of die.
// [MC] End instance variable.
// ======================================================================
// [MC] Constructor.
// [MC] Initialises die to blue background and initial roll.
public Die()
// [MC] Sets the background colour of the die to blue.
setBackground(Color.blue);
// [MC] Sets the foreground colour of the die to gray.
setForeground(Color.gray);
// [MC] Sets the border colour of the die to white.
setBorder(BorderFactory.createMatteBorder(4, 4, 4, 4, Color.white));
// [MC] Sets to random initial value.
roll();
} // [MC] End constructor.
// ======================================================================
// [MC] Method roll.
// [MC] Produces random roll in the range of 1 to 6.
public int roll()
int val = (int)(6*Math.random() + 1); // [MC] Range from 1 to 6.
setValue(val);
return val; // [MC] Returns a value from 1 to 6.
} // [MC] End method roll.
// [MC] Method setValue
// [MC] Sets the value of the die. Causes repaint.
public void setValue(int dots)
myFaceValue = dots;
repaint(); // [MC] Value has changed, must repaint.
} // [MC] End method setValue.
// ======================================================================
// [MC] Method getValue.
// [MC] Returns result of last roll.
public int getValue()
return myFaceValue;
} // [MC] End method getValue.
// ======================================================================
// [MC] Method paintComponent.
// [MC] Draws dots of die face.
public void paintComponent(Graphics g)
// [MC] Call superclass's paint method.
super.paintComponent(g);
// [MC] Sets panel width.
int w = getWidth();
// [MC] Sets panel height.
int h = getHeight();
// [MC] Draws border.
g.drawRect(0, 0, w-1, h-1);
// Switch
switch (myFaceValue)
case 1: drawDot(g, w/2, h/2);
break;
case 3: drawDot(g, w/2, h/2);
case 2: drawDot(g, w/4, h/4);
drawDot(g, 3*w/4, 3*h/4);
break;
case 5: drawDot(g, w/2, h/2);
case 4: drawDot(g, w/4, h/4);
drawDot(g, 3*w/4, 3*h/4);
drawDot(g, 3*w/4, h/4);
drawDot(g, w/4, 3*h/4);
break;
case 6: drawDot(g, w/4, h/4);
drawDot(g, 3*w/4, 3*h/4);
drawDot(g, 3*w/4, h/4);
drawDot(g, w/4, 3*h/4);
drawDot(g, w/4, h/2);
drawDot(g, 3*w/4, h/2);
break;
} // [MC] End switch.
} // [MC] End method paintComponent.
// [MC] Method drawDot.
/** Utility method used by paintComponent(). */
private void drawDot(Graphics g, int x, int y)
// [MC] Gets panel width.
int w = getWidth();
// [MC] Gets panel height.
int h = getHeight();
// [MC] Local variable.
int d;
// [MC] Sets diameter of dot proportional to panel size.
d = (w + h)/10;
// [MC] Sets colour for dot to white.
Color myDotColor = new Color(255, 255, 255);
g.setColor(myDotColor);
// [MC] Draws dot.
g.fillOval(x-d/2, y-d/2, d, d);
} // [MC] End method drawDot.
This is the class giving the error message
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.border.*;
import java.applet.AudioClip;
import java.applet.Applet;
import java.net.*;
// [MC] Public class DicePanel
public class DicePanel extends JPanel
// ======================================================================
// [MC] Instance variables.
// [MC] Creates new instances of the component for the die.
private Die myLeftDie; // [MC] Component for left die.
private Die myRightDie; // [MC] Component for right die.
// [MC] Creates the button (rollButton) to roll the dice.
private JButton rollButton = new JButton("Roll Dice");
// [MC] Creates the text fields. Creates new instance of JTextField.
// [MC] Creates the text field (rollNumberTextField) to display number of rolls.
private JTextField rollNumberTextField = new JTextField(20);
// [MC] Creates the text field (rollResultTextField) to display result of roll.
private JTextField rollResultTextField = new JTextField(20);
// [MC] Creates the text field (rollPointsTextField) to display the player`s points.
private JTextField rollPointsTextField = new JTextField(20);
// [MC] Creates the text field (gameFinalResultTextField) to display the final game result.
private JTextField gameFinalResultTextField = new JTextField(20);
// [MC] Initialises instance variables declared in the inner listeners.
private int result = 0, resultLeft = 0, resultRight = 0;
private int rolls = 0;
private int finalResult = 0;
private int points = 0;
private boolean first = true;
private AudioClip winClip = null;
private AudioClip looseClip = null;
// ======================================================================
// [MC] Constructor. Creates border layout panel.
DicePanel()
// [MC] Creates the dice
myLeftDie = new Die();
myRightDie = new Die();
// ======================================================================
// [MC] Creates the buttons.
// [MC] Creates the button (newGameButton) to start new game.
JButton newGameButton = new JButton("New Game");
// *[MC] Creates the button (rollButton) to roll the dice.
// *JButton rollButton = new JButton("Roll Dice");
// [MC] Sets the font of the buttons.
// [MC[ Sets the font of the button newGameButton.
newGameButton.setFont(new Font("Batang", Font.BOLD, 20));
// [MC[ Sets the font of the button rollButton.
rollButton.setFont(new Font("Batang", Font.BOLD, 20));
// [MC] Sets the button border format.
// [MC] Sets the button with compound borders.
Border compound;
// [MC] Border format local variables.
Border blackline, raisedetched, loweredetched, raisedbevel, loweredbevel, empty;
// [MC] Initialises border formats.
//blackline = BorderFactory.createLineBorder(Color.gray);
raisedetched = BorderFactory.createEtchedBorder(EtchedBorder.RAISED);
loweredetched = BorderFactory.createEtchedBorder(EtchedBorder.LOWERED);
raisedbevel = BorderFactory.createRaisedBevelBorder();
//loweredbevel = BorderFactory.createLoweredBevelBorder();
// [MC] Sets compound border format.
compound = BorderFactory.createCompoundBorder(raisedetched, raisedbevel);
// [MC] Sets the button (newGameButton) with compound border format.
newGameButton.setBorder(compound);
// [MC] Sets the button (rollButton) with compound border format.
rollButton.setBorder(compound);
// [MC] Adds listener.
// [MC] Adds listener to rollButton.
rollButton.addActionListener(new RollListener());
// [MC] Adds listener to newGameButton.
newGameButton.addActionListener(new NewGameListener());
// ======================================================================
// [MC] Creates the labels. Creates new instance of JLabel.
// [MC] Creates the label (rollNumberLabel) for the number of rolls.
JLabel rollNumberLabel = new JLabel("Roll Number");
// [MC] Creates the label (rollResultLabel) for the result of roll.
JLabel rollResultLabel = new JLabel("Roll Result");
// [MC] Creates the label (rollPointsLabel) for the player`s points.
JLabel rollPointsLabel = new JLabel("Player Points");
// [MC] Creates the label (gameFinalResult) for the final game result.
JLabel gameFinalResultLabel = new JLabel("Final Result");
// [MC] Sets the label font.
rollNumberLabel.setFont(new Font("Sansserif", Font.PLAIN, 10));
rollResultLabel.setFont(new Font("Sansserif", Font.PLAIN, 10));
rollPointsLabel.setFont(new Font("Sansserif", Font.PLAIN, 10));
gameFinalResultLabel.setFont(new Font("Sansserif", Font.PLAIN, 10));
// [MC] Sets the label title alignment.
rollNumberLabel.setHorizontalAlignment(JLabel.CENTER);
rollResultLabel.setHorizontalAlignment(JLabel.CENTER);
rollPointsLabel.setHorizontalAlignment(JLabel.CENTER);
gameFinalResultLabel.setHorizontalAlignment(JLabel.CENTER);
// [MC] Sets the label border format.
//rollNumberLabel.setBorder(loweredetched);
//rollResultLabel.setBorder(loweredetched);
//rollPointsLabel.setBorder(loweredetched);
//gameFinalResultLabel.setBorder(loweredetched);
// ======================================================================
// [MC] Sets the text field font.
rollNumberTextField.setFont(new Font("Sansserif", Font.PLAIN, 16));
rollResultTextField.setFont(new Font("Sansserif", Font.PLAIN, 16));
rollPointsTextField.setFont(new Font("Sansserif", Font.PLAIN, 16));
gameFinalResultTextField.setFont(new Font("Sansserif", Font.BOLD, 16));
// [MC] Sets the text field text alignment.
rollNumberTextField.setHorizontalAlignment(JTextField.CENTER);
rollResultTextField.setHorizontalAlignment(JTextField.CENTER);
rollPointsTextField.setHorizontalAlignment(JTextField.CENTER);
gameFinalResultTextField.setHorizontalAlignment(JTextField.CENTER);
// [MC] Sets the text field text colour.
gameFinalResultTextField.setForeground(Color.blue);
// [MC] Sets the text field to not editable.
rollNumberTextField.setEditable(false);
rollResultTextField.setEditable(false);
rollPointsTextField.setEditable(false);
gameFinalResultTextField.setEditable(false);
// ======================================================================
// [MC] Gets sounds.
winClip = getAudioClip(getCodeBase(), "bunny1.au");
looseClip = getAudioClip(getCodeBase(), "bunny1.au");
// ======================================================================
// [MC] Sets the layout manager (GridBagLayout) for this container.
this.setLayout(new GridBagLayout());
// [MC] Creates new instance of GridBagConstraints.
GridBagConstraints c = new GridBagConstraints();
// [MC] Makes the component fill its display area entirely.
c.fill = GridBagConstraints.BOTH;
// [MC] Layouts components.
// [MC] Adds the component newGameButton to this container.
c.gridx = 0; // [MC] Makes this component the leftmost column (column 1).
c.gridy = 0; // [MC] Makes this component the uppermost row (row 1).
c.gridheight = 1; // [MC] Specifies the number of rows the component uses (1 row).
c.gridwidth = 2; // [MC] Specifies the number of columns the component uses (2 columns).
this.add(newGameButton, c); // [MC] Adds the button newGameButton.
// [MC] Adds the component rollButton to this container.
c.gridx = 2; // [MC] Makes this component the third column from left (column 3).
c.gridy = 0; // [MC] Make this component the uppermost row (row 1).
c.gridheight = 1; // [MC] Specifies the number of rows the component uses (1 rows).
c.gridwidth = 2; // [MC] Specifies the number of columns the component uses (2 columns).
this.add(rollButton, c); // [MC] Adds the button rollButton.
// [MC] Adds the component rollNumberLabel to this container.
c.gridx = 0; // [MC] Makes this component the leftmost column (column 1).
c.gridy = 3; // [MC] Makes this component the third row from top (row 3).
c.gridheight = 1; // [MC] Specifies the number of rows the component uses (1 row).
c.gridwidth = 1; // [MC] Specifies the number of columns the component uses (1 column).
c.weightx = 0.1; // [MC] Requests any extra vertical (column) space.
this.add(rollNumberLabel, c); // [MC] Adds the label rollNumberLabel.
// [MC] Adds the component rollResultLabel to this container.
c.gridx = 1; // [MC] Makes this component the second column from left (column 2).
c.gridy = 3; // [MC] Makes this component the third row from top (row 3).
c.gridheight = 1; // [MC] Specifies the number of rows the component uses (1 row).
c.gridwidth = 1; // [MC] Specifies the number of columns the component uses (1 column).
this.add(rollResultLabel, c); // [MC] Adds the label rollResultLabel.
// [MC] Adds the component rollPointsLabel to this container.
c.gridx = 2; // [MC] Makes this component the third column from left (column 3).
c.gridy = 3; // [MC] Makes this component the third row from top (row 3).
c.gridheight = 1; // [MC] Specifies the number of rows the component uses (1 row).
c.gridwidth = 1; // [MC] Specifies the number of columns the component uses (1 column).
this.add(rollPointsLabel, c); // [MC] Adds the label rollPointsLabel.
// [MC] Adds the component gameFinalResultLabel to this container.
c.gridx = 3; // [MC] Makes this component the fourth column from left (column 4).
c.gridy = 3; // [MC] Makes this component the third row from top (row 3).
c.gridheight = 1; // [MC] Specifies the number of rows the component uses (1 row).
c.gridwidth = 1; // [MC] Specifies the number of columns the component uses (1 column).
this.add(gameFinalResultLabel, c); // [MC] Adds the label gameFinalResultLabel.
// [MC] Adds the component rollNumberTextField to this container.
c.gridx = 0; // [MC] Makes this component the leftmost column (column 1).
c.gridy = 4; // [MC] Makes this component the fourth row from top (row 4).
c.gridheight = 1; // [MC] Specifies the number of rows the component uses (1 row).
c.gridwidth = 1; // [MC] Specifies the number of columns the component uses (1 column).
c.weightx = 0.1; // [MC] Requests any extra vertical (column) space.
this.add(rollNumberTextField, c); // [MC] Adds the text field rollNumberTextField.
// [MC] Adds the component rollResultTextField to this container.
c.gridx = 1; // [MC] Makes this component the second column from left (column 2).
c.gridy = 4; // [MC] Makes this component the fourth row from top (row 4).
c.gridheight = 1; // [MC] Specifies the number of rows the component uses (1 row).
c.gridwidth = 1; // [MC] Specifies the number of columns the component uses (1 column).
this.add(rollResultTextField, c); // [MC] Adds the text field rollResultTextField.
// [MC] Adds the component rollPointsTextField to this container.
c.gridx = 2; // [MC] Makes this component the third column from left (column 3).
c.gridy = 4; // [MC] Makes this component the fourth row from top (row 4).
c.gridheight = 1; // [MC] Specifies the number of rows the component uses (1 row).
c.gridwidth = 1; // [MC] Specifies the number of columns the component uses (1 column).
this.add(rollPointsTextField, c); // [MC] Adds the text field rollPointsTextField.
// [MC] Adds the component gameFinalResultTextField to this container.
c.gridx = 3; // [MC] Makes this component the fourth column from left (column 4).
c.gridy = 4; // [MC] Makes this component the fourth row from top (row 4).
c.gridheight = 1; // [MC] Specifies the number of rows the component uses (1 row).
c.gridwidth = 1; // [MC] Specifies the number of columns the component uses (1 column).
this.add(gameFinalResultTextField, c); // [MC] Adds the text field gameFinalResultTextField.
// [MC] Adds the component myLeftDie to this container.
c.gridx = 0; // [MC] Makes this component the leftmost column (column 1).
c.gridy = 1; // [MC] Makes this component the second row from top (row 2).
c.gridheight = 2; // [MC] Specifies the number of rows the component uses (2 rows).
c.gridwidth = 2; // [MC] Specifies the number of columns the component uses (2 columns).
c.weightx = 1.0; // [MC] Requests any extra vertical (column) space.
c.weighty = 1.0; // [MC] Requests any extra horizontal (row) space.
this.add(myLeftDie, c); // [MC] Adds the component myLeftDie.
// [MC] Adds the component myRightDie to this container.
c.gridx = 2; // [MC] Makes this component the third column from left (column 3).
c.gridy = 1; // [MC] Makes this component the second row from top (row 2).
c.gridheight = 2; // [MC] Specifies the number of rows the component uses (2 rows).
c.gridwidth = 2; // [MC] Specifies the number of columns the component uses (2 column).
c.weightx = 1.0; // [MC] Requests any extra column (vertical) space.
c.weighty = 1.0; // [MC] Requests any extra horizontal (row) space.
this.add(myRightDie, c); // [MC] Adds the component myRightDie.
} // [MC] end constructor
// ======================================================================
// [MC] Private class RollListener
// [MC] Inner listener class for rollButton.
private class RollListener implements ActionListener
public void actionPerformed(ActionEvent e)
// [MC] Rolls the dice.
myLeftDie.roll(); // [MC] Rolls left die.
myRightDie.roll(); // [MC] Rolls right die.
finalResult = 0; // [MC] If result = 0 then game is not over.
rolls++; // [MC] Increments the number of rolls.
// [MC] Displays the roll number.
rollNumberTextField.setText(" " + rolls + " ");
// [MC] Returns the result (number of dots) of last roll.
resultLeft = myLeftDie.getValue(); // [MC] Returns the result of the left die.
resultRight = myRightDie.getValue(); // [MC] Returns the result of the right die.
result = resultLeft + resultRight; // [MC] Returns the total result of dice.
// [MC] Displays the result of last roll.
rollResultTextField.setText(" " + result + " ");
// [MC] Sets the rules for the game.
// [MC] Sets the rules for the first roll of dice.
if (first)
// [MC] If the result is 2, 3 or 12 on the first throw, the player loses.
if (result == 2 || result == 3 || result == 12)
finalResult = 2; // [MC] If result = 2 then the player loses and the game is over.
gameFinalResultTextField.setText("LOOSE");
Toolkit.getDefaultToolkit().beep();
rollButton.setEnabled(false); // [MC] Disable rollButton.
first = true; // [MC] Game over after first roll.
// [MC] If the result is 7 or 11 on the first throw, the player wins.
else if (result == 7 || result == 11)
finalResult = 1; // [MC] If result = 1 then the player wins and the game is over.
gameFinalResultTextField.setText("WIN");
//Toolkit.getDefaultToolkit().beep();
rollButton.setEnabled(false); // [MC] Disable rollButton.
first = true; // [MC] Game over after first roll.
// [MC] If the player didn`t win or lose then the results 4, 5, 6, 8, 9 or 10 become the player`s point.
else if (result == 4 || result == 5 || result == 6 || result == 8 || result == 9 || result == 10);
// [MC] Returns the player`s points.
points = result; // [MC] Returns the player`s points.
// [MC] Displays the player`s points.
rollPointsTextField.setText(" " + points + " ");
first = false; // [MC] Game is not over after first roll.
// [MC] Sets the rules for the next rolls (from second roll onwards) of the dice.
// [MC] If the result is 7, then the player loses.
else if (result == 7)
finalResult = 2; // [MC] If result = 2 then the player loses and the game is over.
gameFinalResultTextField.setText("LOOSE");
Toolkit.getDefaultToolkit().beep();
rollButton.setEnabled(false); // [MC] Disable rollButton.
// [MC] If the result is equal to the player`s point, then the player wins.
else if (result == points)
finalResult = 1; // [MC] If result = 1 then the player wins and the game is over.
gameFinalResultTextField.setText("WIN");
winClip.play();
//Toolkit.getDefaultToolkit().beep();
rollButton.setEnabled(false); // [MC] Disable rollButton.
} // [MC] End public void actionPerformed(ActionEvent e).
} // [MC] End private class RollListener.
// ======================================================================
// [MC] Private class NewGameListener
// [MC] Inner listener class for newGameButton.
private class NewGameListener implements ActionListener
public void actionPerformed(ActionEvent e)
// [MC] Initialises instance variables.
first = true; // [MC] Initialise dice roll to first roll.
rolls = 0; // [MC] Initialises number of rolls to 0.
// [MC] Initialises text fields.
rollResultTextField.setText("");
rollNumberTextField.setText("");
rollPointsTextField.setText("");
gameFinalResultTextField.setText("");
rollButton.setEnabled(true); // [MC] Enable rollButton.
} // [MC] End public void actionPerformed(ActionEvent e).
}// [MC] End private class NewGameListener implements ActionListener.
} // [MC] End public class DicePanel extends JPanel.make a backup copy before these changes
it now compiles, but I haven't run/tested it
changed constructor to init(), extending Applet, not JApplet
// [MC] Public class DiceApplet
public class DiceApplet extends Applet
// [MC] Constructor.
public void init()
// [MC] Sets the contentPane property. This method is called by the constructor.
add(new DicePanel());
}then the 'error lines' become
winClip = ((Applet)getParent()).getAudioClip(((Applet)getParent()).getCodeBase(), "bunny1.au");
looseClip = ((Applet)getParent()).getAudioClip(((Applet)getParent()).getCodeBase(), "bunny1.au");there might be additional problems when you run/test it, but this might get you started -
"cannot resolve symbol" when compiling a class that calls methods
I am currently taking a Intro to Java class. This problem has my instructor baffled. If I have two classes saved in separate files, for example:
one class might contain the constructor with get and set statements,
the other class contains the main() method and calls the constructor.
The first file compiles clean. When I compile the second file, I get the "cannot resolve symbol error" referring to the first class.
If I copy both files to floppy and take them to school. I can compile and run them with no problem.
If I copy the constructor file to the second file and delete the "public" from the class declaration of the constructor, it will compile and run at home.
At home, I am running Windows ME. At school, Windows 2000 Professional.
The textbook that we are using came with a CD from which I downloaded the SDK and Runtime Environment. I have tried uninstalling and reinstalling. I have also tried downloading directly from the Sun website and still the error persists.
I came across a new twist tonight. I copied class files from the CD to my hard drive. 4 separate files. 3 of which are called by the 4th.
I can run these with no problem.
Any ideas, why I would have compile errors????
Thanks!!Oooops ... violated....
Well first a constructor should have the same name as the class name so in our case what we have actually created is a static method statementOfPhilosophy() in class SetUpSite and not a constructor.
Now why does second class report unresolved symbol ???
Look at this line
Class XYZ=new XYZ();
sounds familiar, well this is what is missing from your second class, since there is no object how can it call a method ...
why the precompiled classes run is cuz they contain the right code perhaps so my suggestion to you is,
1) Review the meaning and implementation of Constructors
2) Ask your instructor to do the same ( no pun intended ... )
3) Check out this for understanding PATH & CLASSPATH http://www.geocities.com/gaurav007_2000/java/
4) Look at the "import" statement, when we have code in different files and we need to incorporate some code in another it is always a good idea to use import statement, that solves quite a few errors.
5) Finally forgive any goof up on this reply, I have looked at source code after 12 months of hibernation post dot com doom ... so m a bit rusty... shall get better soon though :)
warm regards and good wishes,
Gaurav
CW :-> Mother of all computer languages.
I HAM ( Radio-Active )
* OS has no significance in this error
** uninstalling and reinstalling ? r u nuttttttts ??? don't ever do that again unless your compiler fails to start, as long as it is giving a valid error it is working man ... all we need to do is to interpret the error and try to fix the code not the machine or compiler.
Maybe you are looking for
-
[mostly solved]RaLink RT2860 wireless NIC not working, in eeePC 1000HE
I'm having trouble getting my wireless NIC to work. I have a clean, up-to-date system, no [testing]. I'm using the stock kernel, 2.6.30, which according to the 1000HE wiki (http://wiki.archlinux.org/index.php/Asu … 000HE#WiFi), is supposed to work o
-
Parts of content disappears in IE
I think I posted this in the wrong section the first time: I've built a site which has a welcome text and some images, both in separate movie clips based at _root. At the top left of the movie clips, also in _root, are two empty movie clips, waiting
-
No reset option in about:support (firefox 32)
at about:support there is no option to reset firefox to it's default state. this option should be available in the upper right hand portion of the screen on this page. When I restarted firefox in safe mode the only option on the dialog box was to sta
-
Error after delivery " foreign trade data incomplete"
hi, when i was trying to do billing it was showing an error . document 90000069 has been saved foreign trade data incomplete . i have tried to do but i am not getting right path .
-
Hi everyone, I want to run a batch file, located somewhere in my Hard disk and I can't do it. I asked a friend and he told me to try Runtime.getRuntime().exec("C:\\myBatch.bat"); but it doesn't work. It works if I put "notepad" instead of C:\\myBatch