Need help with java applet

Hi all,
Am having trouble with a java applet that won't run under Mozilla, Seamonkey, and IE 6 but will run under IE 7 Beta 2. Am posting the error info below in the hope that someone can see what could be wrong as i don't want to upgrade user's to IE 7 since it's a beta and also since most of them use mozilla. thanks in advance:
load: class com.crystaldecisions.ReportViewer.ReportViewer not found.
java.lang.ClassNotFoundException: com.crystaldecisions.ReportViewer.ReportViewer
     at sun.applet.AppletClassLoader.findClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at sun.applet.AppletClassLoader.loadClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at sun.applet.AppletClassLoader.loadCode(Unknown Source)
     at sun.applet.AppletPanel.createApplet(Unknown Source)
     at sun.plugin.AppletViewer.createApplet(Unknown Source)
     at sun.applet.AppletPanel.runLoader(Unknown Source)
     at sun.applet.AppletPanel.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)
Caused by: java.io.IOException: open HTTP connection failed.
     at sun.applet.AppletClassLoader.getBytes(Unknown Source)
     at sun.applet.AppletClassLoader.access$100(Unknown Source)
     at sun.applet.AppletClassLoader$1.run(Unknown Source)
     at java.security.AccessController.doPrivileged(Native Method)
     ... 10 more
Exception in thread "Thread-5" java.lang.NullPointerException
     at sun.plugin.util.GrayBoxPainter.showLoadingError(Unknown Source)
     at sun.plugin.AppletViewer.showAppletException(Unknown Source)
     at sun.applet.AppletPanel.runLoader(Unknown Source)
     at sun.applet.AppletPanel.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)
java.lang.NullPointerException
     at sun.plugin.util.GrayBoxPainter.showLoadingError(Unknown Source)
     at sun.plugin.AppletViewer.showAppletStatus(Unknown Source)
     at sun.applet.AppletPanel.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)
Exception in thread "thread applet-com.crystaldecisions.ReportViewer.ReportViewer" java.lang.NullPointerException
     at sun.plugin.util.GrayBoxPainter.showLoadingError(Unknown Source)
     at sun.plugin.AppletViewer.showAppletException(Unknown Source)
     at sun.applet.AppletPanel.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)

BigDaddyLoveHandles wrote:
h1. {color:red}MULTIPOST: [http://forums.sun.com/thread.jspa?threadID=5358840&messageID=10564025]{color}
That wasn't attention-grabbing enough apparantly. Let's try it again.
h1. {color:red}MULTIPOST: [http://forums.sun.com/thread.jspa?threadID=5358840&messageID=10564025]{color}
h1. {color:red}MULTIPOST: [http://forums.sun.com/thread.jspa?threadID=5358840&messageID=10564025]{color}
h1. {color:red}MULTIPOST: [http://forums.sun.com/thread.jspa?threadID=5358840&messageID=10564025]{color}
h1. {color:red}MULTIPOST: [http://forums.sun.com/thread.jspa?threadID=5358840&messageID=10564025]{color}
h1. {color:red}MULTIPOST: [http://forums.sun.com/thread.jspa?threadID=5358840&messageID=10564025]{color}

Similar Messages

Need help with Java applet, might need NetBeans URL

I posted the below question. It was never answered, only I was told to post to the NetBeans help forum. Yet I don't see any such forum on this site. Can someone tell me where the NetBeans help forum is located (URL).
Here is my original question:
I have some Java source code from a book that I want to compile. The name of the file is HashTest.java. In order to compile and run this Java program I created a project in the NetBeans IDE named javaapplication16, and I created a class named HashTest. Once the project was created, I cut and pasted the below source code into my java file that was default created for HashTest.java.
Now I can compile and build the project with no errors, but when I try and run it, I get a dialog box that says the following below (Ignore the [...])
[..................Dialog Box......................................]
Hash Test class wasn't found in JavaApplication16 project
Select the main class:
<No main classes found>
[..................Dialog Box......................................]
Does anyone know what the problem is here? Why won't the project run?
// Here is the source code: *****************************************************************************************************
import java.applet.*;
import java.awt.*;
import java.awt.geom.*;
import java.awt.event.*;
import java.util.*;
public class HashTest extends Applet implements ItemListener
// public static void main(String[] args) {
// Hashtable to add tile images
private Hashtable imageTable;
// a Choice of the various tile images
private Choice selections;
// assume tiles will have the same width and height; this represents
// both a tile's width and height
private int imageSize;
// filename description of our images
private final String[] filenames = { "cement.gif", "dirt.gif", "grass.gif",
"pebbles.gif", "stone.gif", "water.gif" };
// initializes the Applet
public void init()
int n = filenames.length;
// create a new Hashtable with n members
imageTable = new Hashtable(n);
// create the Choice
selections = new Choice();
// create a Panel to add our choice at the bottom of the window
Panel p = new Panel();
p.add(selections, BorderLayout.SOUTH);
p.setBackground(Color.RED);
// add the Choice to the applet and register the ItemListener
setLayout(new BorderLayout());
add(p, BorderLayout.SOUTH);
selections.addItemListener(this);
// allocate memory for the images and load 'em in
for(int i = 0; i < n; i++)
Image img = getImage(getCodeBase(), filenames);
while(img.getWidth(this) < 0);
// add the image to the Hashtable and the Choice
imageTable.put(filenames[i], img);
selections.add(filenames[i]);
// set the imageSize field
if(i == 0)
imageSize = img.getWidth(this);
} // init
// tiles the currently selected tile image within the Applet
public void paint(Graphics g)
// cast the sent Graphics context to get a usable Graphics2D object
Graphics2D g2d = (Graphics2D)g;
// save the Applet's width and height
int width = getSize().width;
int height = getSize().height;
// create an AffineTransform to place tile images
AffineTransform at = new AffineTransform();
// get the currently selected tile image
Image currImage = (Image)imageTable.get(selections.getSelectedItem());
// tile the image throughout the Applet
int y = 0;
while(y < height)
int x = 0;
while(x < width)
at.setToTranslation(x, y);
// draw the image
g2d.drawImage(currImage, at, this);
x += imageSize;
y += imageSize;
} // paint
// called when the tile image Choice is changed
public void itemStateChanged(ItemEvent e)
// our drop box has changed-- redraw the scene
repaint();
} // HashTest

BigDaddyLoveHandles wrote:
h1. {color:red}MULTIPOST: [http://forums.sun.com/thread.jspa?threadID=5358840&messageID=10564025]{color}
That wasn't attention-grabbing enough apparantly. Let's try it again.
h1. {color:red}MULTIPOST: [http://forums.sun.com/thread.jspa?threadID=5358840&messageID=10564025]{color}
h1. {color:red}MULTIPOST: [http://forums.sun.com/thread.jspa?threadID=5358840&messageID=10564025]{color}
h1. {color:red}MULTIPOST: [http://forums.sun.com/thread.jspa?threadID=5358840&messageID=10564025]{color}
h1. {color:red}MULTIPOST: [http://forums.sun.com/thread.jspa?threadID=5358840&messageID=10564025]{color}
h1. {color:red}MULTIPOST: [http://forums.sun.com/thread.jspa?threadID=5358840&messageID=10564025]{color}

Helpdesk Agent Needs help with JAVA applet not loading for HTTPS site

Sorry....I am posting here as I do not know where to start.
JAVA Console Message. The applet runs via HTTP URL but will not load via HTTPS. Any idea would be much appreciated.
load: class com.ebreviate.auction.applet.TickerTape.class not found.
java.lang.ClassNotFoundException: com.ebreviate.auction.applet.TickerTape.class
     at sun.applet.AppletClassLoader.findClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at sun.applet.AppletClassLoader.loadClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at sun.applet.AppletClassLoader.loadCode(Unknown Source)
     at sun.applet.AppletPanel.createApplet(Unknown Source)
     at sun.plugin.AppletViewer.createApplet(Unknown Source)
     at sun.applet.AppletPanel.runLoader(Unknown Source)
     at sun.applet.AppletPanel.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)
Caused by: java.io.IOException: open HTTP connection failed.
     at sun.applet.AppletClassLoader.getBytes(Unknown Source)
     at sun.applet.AppletClassLoader.access$100(Unknown Source)
     at sun.applet.AppletClassLoader$1.run(Unknown Source)
     at java.security.AccessController.doPrivileged(Native Method)
     ... 10 more
Exception in thread "Thread-7" java.lang.NullPointerException
     at sun.plugin.util.GrayBoxPainter.showLoadingError(Unknown Source)
     at sun.plugin.AppletViewer.showAppletException(Unknown Source)
     at sun.applet.AppletPanel.runLoader(Unknown Source)
     at sun.applet.AppletPanel.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)
java.lang.NullPointerException
     at sun.plugin.util.GrayBoxPainter.showLoadingError(Unknown Source)
     at sun.plugin.AppletViewer.showAppletStatus(Unknown Source)
     at sun.applet.AppletPanel.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)
Exception in thread "thread applet-com.ebreviate.auction.applet.TickerTape.class" java.lang.NullPointerException
     at sun.plugin.util.GrayBoxPainter.showLoadingError(Unknown Source)
     at sun.plugin.AppletViewer.showAppletException(Unknown Source)
     at sun.applet.AppletPanel.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)
load: class com.ebreviate.auction.applet.graph.LineGraph.class not found.
java.lang.ClassNotFoundException: com.ebreviate.auction.applet.graph.LineGraph.class
     at sun.applet.AppletClassLoader.findClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at sun.applet.AppletClassLoader.loadClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at sun.applet.AppletClassLoader.loadCode(Unknown Source)
     at sun.applet.AppletPanel.createApplet(Unknown Source)
     at sun.plugin.AppletViewer.createApplet(Unknown Source)
     at sun.applet.AppletPanel.runLoader(Unknown Source)
     at sun.applet.AppletPanel.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)
Caused by: java.io.IOException: open HTTP connection failed.
     at sun.applet.AppletClassLoader.getBytes(Unknown Source)
     at sun.applet.AppletClassLoader.access$100(Unknown Source)
     at sun.applet.AppletClassLoader$1.run(Unknown Source)
     at java.security.AccessController.doPrivileged(Native Method)
     ... 10 more
Exception in thread "Thread-6" java.lang.NullPointerException
     at sun.plugin.util.GrayBoxPainter.showLoadingError(Unknown Source)
     at sun.plugin.AppletViewer.showAppletException(Unknown Source)
     at sun.applet.AppletPanel.runLoader(Unknown Source)
     at sun.applet.AppletPanel.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)
java.lang.NullPointerException
     at sun.plugin.util.GrayBoxPainter.showLoadingError(Unknown Source)
     at sun.plugin.AppletViewer.showAppletStatus(Unknown Source)
     at sun.applet.AppletPanel.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)
Exception in thread "thread applet-com.ebreviate.auction.applet.graph.LineGraph.class" java.lang.NullPointerException
     at sun.plugin.util.GrayBoxPainter.showLoadingError(Unknown Source)
     at sun.plugin.AppletViewer.showAppletException(Unknown Source)
     at sun.applet.AppletPanel.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)

I am repeating the question that RHM submitted...has anyone found a solution to this issue...Applet com.pogo.client.jvmtest.applet started. I was not having a problem and then out of no where on Sept. 13 my game rooms failed to load and this message started appearing. I have done everything asked of me to clear files both Internet and Java, to uninstall, re-install, etc...nothing works. Does anyone have an answer for a very non technical user?

Need help with advanced applet

I need help with designing an applet as follows. Can someone give me a basic layout of code and material so i can fill in the rest or at leats give me some hints so i can get started since i am like no good at applets.
Design and implement an applet that graphically displays the processing
of a selection sort. Use bars of various heights to represent
the values being sorted. Display the set of bars after each swap. Put
a delay in the processing of the sort to give the human observer a
chance to see how the order of the values changes.
heres a website that does something similar
http://www.cs.ubc.ca/spider/harrison/Java/sorting-demo.html

elasolova wrote:
i will not help you this time. but if you buy me a candy maybe i can reconsider the issue. :PI suggest an all-day sucker.

Need help with Java, have a few questions about my Applet

Purpose of the program: To create a mortgage calculator that will allow the user to input the loan principal then select 1 of 3 choices from a combo-box (7 years @ 5.35%, 15 years @ 5.50%, 30 years @ 5.75%).
Problem: My program was working properly (so I thought). I can get the program to properly compile and run through TextPad. However, I noticed that when the user clicks the calculate more than once (with the same input), it slightly alters the output calculations. So that is my first question, Why is it doing that? How can I get it only calculate that information once unless the user changes it etc?
My next question is regarding my exit button. I was told by my instructor (who has already stated he won't help any of us) that my exit button does not work for an applet and only for an application. So, how can I create an exit button that will work with an applet? I thought I did it right but I can't find any resources online for this.
Next question, why isn't my program properly validating invalid input? My program should only allow numeric input and nothing more.
And last question, when invalid input is entered and the user clicks calculate, why isn't my JOptionPane window for error messages not displaying?
I know my code is a little long so I have to post this in two messages. Please don't criticize me for what I am doing, that is why I am learning and have come to this forum for help. Thanks
import java.applet.Applet;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
import java.text.NumberFormat;
import java.text.DecimalFormat;
// Creating the main class
public class test extends JApplet implements ActionListener
     // Defining of format information
     JLabel heading = new JLabel("McBride Financial Services Mortgage Calculator");
     Font newFontOne = new Font("TimesRoman", Font.BOLD, 20);
     Font newFontTwo = new Font("TimesRoman", Font.ITALIC, 16);
     Font newFontThree = new Font("TimesRoman", Font.BOLD, 16);
     Font newFontFour = new Font("TimesRoman", Font.BOLD, 14);
     JButton calculate = new JButton("Calculate");
     JButton exitButton = new JButton("Quit");
     JButton clearButton = new JButton("Clear");
     JLabel instructions = new JLabel("Please Enter the Principal Amount Below");
     JLabel instructions2 = new JLabel("and Select a Loan Type from the Menu");
     // Declaration of variables
     private double principalAmount;
     private JLabel principalLabel = new JLabel("Principal Amount");
     private NumberFormat principalFormat;
     private JTextField enterPrincipal = new JTextField(10);
     private double finalPayment;
     private JLabel monthlyPaymentLabel = new JLabel(" Monthly Payment    \t         Interest Paid    \t \t            Loan Balance");
     private NumberFormat finalPaymentFormat;
     private JTextField displayMonthlyPayment = new JTextField(10);
     private JTextField displayInterestPaid = new JTextField(10);
     private JTextField displayBalance = new JTextField(10);
     // Creation of the String of arrays for the ComboBox
     String [] list = {"7 Years @ 5.35%", "15 Years @ 5.50%", "30 Years @ 5.75%"};
     JComboBox selections = new JComboBox(list);
     // Creation of the textArea that will display the output
     private TextArea txtArea = new TextArea(5, 10);
     StringBuffer buff = null;
          Edited by: LoveMyAJ on Jan 19, 2009 1:49 AM

// Initializing the interface
     public void init()
          // Creation of the panel design and fonts
          JPanel upper = new JPanel(new BorderLayout());
          JPanel middle = new JPanel(new BorderLayout());
          JPanel lower = new JPanel(new BorderLayout());
          JPanel areaOne = new JPanel(new BorderLayout());
          JPanel areaTwo = new JPanel(new BorderLayout());
          JPanel areaThree = new JPanel(new BorderLayout());
          JPanel areaFour = new JPanel(new BorderLayout());
          JPanel areaFive = new JPanel(new BorderLayout());
          JPanel areaSix = new JPanel(new BorderLayout());
          Container con = getContentPane();
          getContentPane().add(upper, BorderLayout.NORTH);
          getContentPane().add(middle, BorderLayout.CENTER);
          getContentPane().add(lower, BorderLayout.SOUTH);
          upper.add(areaOne, BorderLayout.NORTH);
          middle.add(areaTwo, BorderLayout.NORTH);
          middle.add(areaThree, BorderLayout.CENTER);
          middle.add(areaFour, BorderLayout.SOUTH);
          lower.add(areaFive, BorderLayout.NORTH);
          lower.add(areaSix, BorderLayout.SOUTH);
          heading.setFont(newFontOne);
          instructions.setFont(newFontTwo);
          instructions2.setFont(newFontTwo);
          principalLabel.setFont(newFontThree);
          monthlyPaymentLabel.setFont(newFontFour);
          displayInterestPaid.setFont(newFontFour);
          displayBalance.setFont(newFontFour);
          areaOne.add(heading, BorderLayout.NORTH);
          areaOne.add(instructions, BorderLayout.CENTER);
          areaOne.add(instructions2, BorderLayout.SOUTH);
          areaTwo.add(principalLabel, BorderLayout.WEST);
          areaTwo.add(enterPrincipal, BorderLayout.EAST);
          areaThree.add(selections, BorderLayout.NORTH);
          areaFour.add(calculate, BorderLayout.CENTER);
          areaFour.add(exitButton, BorderLayout.EAST);
          areaFour.add(clearButton, BorderLayout.WEST);
          areaFive.add(monthlyPaymentLabel, BorderLayout.CENTER);
          areaSix.add(txtArea, BorderLayout.CENTER);
          // Using the ActionListener to determine when each button is clicked
          calculate.addActionListener(this);
          exitButton.addActionListener(this);
          clearButton.addActionListener(this);
          enterPrincipal.requestFocus();
          selections.addActionListener(this);
     // The method that will perform specific actions defined below
     public void actionPerformed(ActionEvent e)
          Object source = e.getSource();
          buff = new StringBuffer();
          // Outcome of pressing the calculate button
          if (source == calculate)
               // Used to call upon the user chosen selection
               int selection = selections.getSelectedIndex();
               // If statement to call upon Loan One's Method
               if (selection == 0)
                    Double data = (Double)calculateLoanOne();
                    String sourceInput = data.toString();
                    displayMonthlyPayment.setText(sourceInput);
                    txtArea.setText(buff.toString());
               // If statement to call upon Loan Two's Method
               else if (selection == 1)
                    Double data = (Double)calculateLoanTwo();
                    String sourceInput = data.toString();
                    displayMonthlyPayment.setText(sourceInput);
                    txtArea.setText(buff.toString());
               // If statement to call upon Loan Three's Method
               else if (selection == 2)
                    Double data = (Double)calculateLoanThree();
                    String sourceInput = data.toString();
                    displayMonthlyPayment.setText(sourceInput);
                    txtArea.setText(buff.toString());
               // Outcome of pressing the clear button
               else if (source == clearButton)
                    enterPrincipal.setText("");
                    displayMonthlyPayment.setText("");
                    selections.setSelectedIndex(0);
                    txtArea.setText("");
               // Outcome of pressing the quit button
               else if (source == exitButton)
                    System.exit(1);
     // Method used to validate user input
     private static boolean validate(JTextField in)
          String inText = in.getText();
          char[] charInput = inText.toCharArray();
          for(int i = 0; i < charInput.length; i++)
               int asciiVal = (int)charInput;
          if((asciiVal >= 48 && asciiVal <= 57) || asciiVal == 46)
          else
               JOptionPane.showMessageDialog(null, "Invalid Character, Please Use Numeric Values Only");
               return false;
               return true;

Need help with java

ok so i have a midterm and need help this question that is gonna be on the midterm. i dont know how to do it and its worth 16 marks!!!! here it is
the UW Orchestra wants to produce a CD containing all the pieces of music
from its upcoming concert. In order to do that, it needs to calculate the total length of time for the
CD. In addition, the conductor wishes to know which piece of music has the longest duration.
Sample output for the program.
The Swan (3.88)
The Bee (0.98)
Claire de Lune (6.02)
Liebesfreund (3.38)
Ragtime (3.48)
The total time for the CD is 18.74 minutes.
The longest piece is Claire de Lune.
Do not include the HTML that is required to embed the program into a Web page (that is, show
only what you would write between <script> and </script> tags).
[4 marks] In the following space, define a function, Print, that takes two parameters, Title and
Length, and outputs a line of text such that Title appears in italics, followed by Length in
parentheses. The function also returns the value of Length.
For example, Print("My World",30) will output the line
My World (30)
and return the value 30.
Put your JavaScript program for the remainder of this question in the space provided on the next
two pages.
[9 marks]. For each piece of music, your program should input the title of the piece and the
duration (in minutes) for that piece, and it should output a line showing those values using the
Print function just defined. After all pieces have been listed, the program should output the
total length of time for the CD, adding in 0.25 minutes between each piece of music (which is
needed on the CD to separate the pieces).
[3 marks] The program should also output the name of the piece that has the longest playing
time.
Use reasonable variable names, indentation and good programming style. Documentation and
comments are not required, but you may add them to explain any assumptions you might want to
make. You need not check that the input is valid, and you may assume that no two pieces have the
same duration.
can anyone help me out! i would be indebt of ur kindness if u can help me out!

This forum is for Java, not JavaScript. The two have nothing to do with each other.
And anyway, this is your studying, so you should try to do it, put forth your best effort, and ask specific questions (on the proper fourm).

Need help with java J2Se 5.0 upgrade 2

Having problems with Java when playing on Pogo, the Vaults of Atlantis. When loading, I am getting a message that says that I need to remove and download again, java. That it is not working correctly. I did that yesterday, 05/27/05 and am still experiencing the problem but only after signing off from Pogo and AOL and then trying to sign back on again later in the day. I have to shutdown my computer and bring it back up again and then I can load the Vaults of Atlantis. I have noticed that when I do sign-off from Pogo and AOL, that my java cup stays on in my deskbar. Is that supposed to be normal or is it supposed to disappear? If it is supposed to disappear, what can I do to fix that problem?
Please, can anyone help?

Go here http://www.java.com/en/ and click "Download Now".
If that has problems, click the "Manual Download" link and download the "Windows (Offline Installation)".
If there are problems, review the Help information to resolve.

Newbie need help wtih Java Applet noinit error

Hi, i am having problem with a making this java applet application run, i am new to java but i am sure that my coding is right, because this what i typed from my java class book. Don't know why when i try to run it is say at the bottom of the windows explorer, "applet class name "noinit"". The code is listed below maybe someone could help me figure this out. I used NetBean to compile it, also I have the latest version of java but could not find a applet that come with the newest version of java so I'm using the j2sdk1.4.2_11 applet, and have added it to my system environment path. Maybe that could be the problem if so where do i get the newest version of the applet, because without doing what i did i could run applets in the first place. My other sample applet sample (demo's) that come with Java runs fine without any problem. Only when i run mine i get the message, "applet class name noinit".
HTML file:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Welcome Applet</title>
</head>

<applet code="WelcomeApplet.class" width="300" height="45">
alt="Your browser understands the <;APPLET> tag but isn't running the applet, for some reason."
     Your browser is completely ignoring the <APPLET> tag!
</applet>
<body>
</body>
</html>Java code:
/* Fig. 3.6: WelcomeApplet.java
* My first applet in Java
* Created on May 2, 2006, 2:50 AM
// Java packages
package appletjavafig3_6;
import java.awt.Graphics;   // import class Graphics
import javax.swing.JApplet; // import class JApplet
public class WelcomeApplet extends JApplet {
    public WelcomeApplet(){
    // 3rd method that is called by default
    // draw text on applets's background
    public void paint( Graphics g)
        // call superclass version of method paint
        super.paint(g);
        // draw a String at x-coordinate 25 and y coordinate 25
        g.drawString("Welcome to Java Programming!", 25,25);
    } // end method paint
} // WelcomeApplet

Hi,
Your applet code in the html should be
<applet code="appletjavafig3_6.WelcomeApplet" width="300" height="45">
alt="Your browser understands the <;APPLET> tag but isn't running the applet, for some reason."
     Your browser is completely ignoring the <APPLET> tag!
</applet>As the class is inside a package named appletjavafig3_6, put the class file inside a folder named appletjavafig3_6. Put the html file outside this folder and test it.

Need help with Java always get error

hey guys need help
this the problem i get :
I go to certain websites and I get this error with firefox.
This Site requires that JavaScript be enabled.
It is enabled.
This is the one of the errors in java script console with firefox.
Error: [Exception... "'Component does not have requested interface' when calling method: [nsIInterfaceRequestor::getInterface]" nsresult: "0x80004002 (NS_NOINTERFACE)" location: "<unknown>" data: no]
I have installed the java script from there home site and did a test and says everything is fine. Any ideas?
please help

Hi 49ers,
Sorry not to have any real idea of how to help you out here, but this is a Java forum, not JavaScript.
Some Firefox expert may stumble across your post and be able to offer some advice (I hope they do) but this isn't really the best place to post such questions.
Try here: http://www.webdeveloper.com/forum/forumdisplay.php?s=&forumid=3
Good luck!
Chris.

Need help with Java programming installation question

Sorry for my lack of knowledge about Java programming, but:....
A while back I thought I had updated my Java Runtime Environment programming. But I now apparently have two programs installed, perhaps through my not handling the installation properly. Those are:
J2SE Runtime Environment 5.0 update 5.0 (a 118MB file)
and:
Java 2 Runtime Environment, SE v 1.4.2_05 (a 108MB file)
Do I need both of these installed? If not, which should I uninstall?
Or, should I just leave it alone, and not worry about it?
Yeah, I don't have much in the way of technical knowledge...
Any help or advice would be appreciated. Thank you.
Bob VanHorst

Thanks for the feedback. I think I'll do just that. Once in a while I have a problem with Java not bringing up a webcam shot, but when that happens, it seems to be more website based than a general condition.

Need help with java will even pay

I need extreme help. I just don't have time lately to write these programs and I have fallen extremely behind. Basically all I need is to pass this class and right now until I can get some more help I just can't make the deadlines. If someone could help me I will pay you just like a tutor.
Requirements for Lab.
You will need to develop a variety of classes for this lab. Specifically, you need to create:
+1. a "PersonGUI" class that displays fields for a person's: firstName, lastName, identificationNum, and sex.+
+2. a "StudentGUI" class that provides Java components for the entry of: classification (freshman, sophomore, junior, senior, or graduate student), and Checkboxes for (a student being in the Honor's program and/or in the ROTC).+
+3. a "FacultyGUI" class that provides Java components for the entry of: rank (instructor, assistant, associate, or full professor), years of service, and salary.+
+4. a "Statistics" class that, when instantiated, creates an object containing an instance variable for each of the the statistical values outlined below. (Each of these instance variables should be declared to be "private".)+
Your main Lab6 class should provide a means for the user to:
+1. Specify the kind of personal data to be entered (Student or Faculty), and+
+2. Then, depending on the choice made, appropriate fields should be displayed to allow the user to input appropriate information for the type of personal data being entered, and+
+3. Controls that support the following functionality:+
* a "CANCEL" control that will terminate any operation currently being performed and return the user to the "Startup" window.
* a "SAVE" control that will cause the just entered data to be harvested from the graphical user interface and the appropriate statistics to be updated. Note: this function may NOT be performed if any of the student or faculty member data fields have not been filled in.
* a "RESET" control that will erase all information recorded to date (i.e., all summary variables are reset to zero).
* a "CLEAR" control that will erase all fields for the personal data currently being entered.
* and a "DISPLAY TOTALS" control that will display, when pressed, the following data:
+1. For students:+
+1. total number of students entered so far,+
+2. number who are male and number who are female,+
+3. number of freshmen, sophomores, juniors, seniors, and graduate students,+
+4. number of students who are in the Honor's program and number who are in the ROTC.+
+2. For faculty:+
+1. total number of faculty entered so far,+
+2. number who are male and number who are female,+
+3. the name and salary of the highest paid faculty member on campus.+
Your program should validate numeric data to the extent:
+1. no numeric field (id number, years of service, or salary) may be left blank by the user. If done so, the user should be alerted to enter a numeric value.+
+2. when the user enters a "years of service" value for a faculty member - the value entered should be verified to be a valid integer value in the range 1 to 50. If the data entered is outside the valid range or is not a valid integer - your program should reject the value and prompt the user that invalid data has been entered and that a new value is necessary.+
+3. when a faculty salary is entered, verify that it is a floating-point value in the range $35,000 to $200,000. Handle invalid data as described above.+
+4. Similarly, if an invalid integer value is entered for the identification number, the value should be rejected and the user prompted to reenter.+
+5. Information should not be saved, nor should statistical values be updated, until all numeric data has been validated.+
Note -- You will be graded on appropriate use of instance vs. local variables, use of methods, and passing parameters and returning appropriate values.
+1. The 'Statistics" class MUST provide "mutator" and "accessor" methods that are required to access values or to modify the values of any variable. REMEMBER ALL VARIABLES ARE DECLARED TO BE "private"!!+
+2. You should implement methods to verify the data, as detailed above. The methods should return boolean values indicating whether the data is acceptable or not.+

Sorry to hear about your problems - lack of time, having fallen behind, imminent failure etc - but none of these are Java problems.
This site deals with Java problems: compiler or runtime behaviour that people can't understand. If you have problems of that sort (and especially if solving those problems would help with the problems you did describe) then post them.
Otherwise you would seem to be in the wrong place.

Need Help with Java Desktop CP Icon

I just formatted and reinstalled Windows XP Home SP2 and installed the JRE 1.5.0.02. I usually see an icon in my Control Panel but it only appears in the Administrator's CP which I can reach in Safe Mode of course, but it would be easier to deal with if it appeared somewhere on my desktop/taskbar or CP (I am also an Admin). In Safe Mode I made sure that the right settings were made for displaying, but it doesn't.
I know precious little about Java so I need help here.

This forum is dedicated to Sun's Java Desktop System, an alternative desktop operating environment. Try reposting here:
http://forum.java.sun.com/forum.jspa?forumID=54

Help with java applets

Ok i know i haven't read the applet tutorial or had much experience with applets but just hear me out and see if you can help me.
BACKGROUND
Ok...so i have previously viewed an applet on windows viewing an html file on my computer. I am trying to view just the most simple applet (helloworld) on linux. I'm using Ubuntu linux, the latest version as of February 23, 2006.I created an applet file and an html file in the same directory with the html file having an <applet> tag in it linking to the HelloWorldApp. I have tried viewing the html file and the java applet won't load. Everything other than the applet worked and I'm just stuck.
So my plea is would somebody please just paste the bare minimum html file and applet file that you can see an applet with? I want to learn about applets and will do the tutorial but I would really like to just see one.
Please help,
A frustrated applet noob
p.s.
According to java.com I have installed JRE 5.0 and i have compiled a java application so I'm pretty sure I have successfully installed JDK 5.0.

Bob, what web browser are you using?
Make sure that the browser supports Java applets.
If you want just to debug your applet try appletviewer utility
from JDK first.

Need help with Java Script to perform a calculation in Adobe Acrobat Pro 9 form

I have a form (test) that I am creating in Adobe Acrobat Pro 9.
I need help creating custom Java Script so I can get the desired answer.
1) There are several questions in each group that require a numerical answer between 0-4
2) There is a total field set up to sum the answers from all above questions
3) The final "score" takes the answer from Step 2 above and divides by the total possible answer
Any help on what Java Script I need to complete this would be greatly appreciated!
I've attached a "spreadsheet" that shows it in more detail as well as what formulas I used in Excel to get the desired end result.
Thanks in advance.

Have you tried the "The field is the average of:"?

Help with Java Applet Design

Hi,
I'm a uni student and I've had some programming experience in Java, although sadly a bit lacking in the area of Java Applets.
Recently I've being involved in a project where some tests are ran a number of times and a Data Aquisition System is used to transfer the number of cycles the test have currently done onto the computer, in a .csv file.
What I would like to do is to make this count available in a web browser LIVE.
I've come up with an idea, which is to write a Java Applet to read this file and output the correct count value in a textbox or what ever, however I am having a bit of difficulty making this update live.
Should I have some sort of script inside the webpage source that re-
runs the applet at regular intervals? If then how would that be possible?
Or should I have the applet re-read the file at regular intervals and repaint it-self? If then there will be problems with timers and possible execution threads (which I don't quite understand yet)?
One thing I want to be careful of is that this file to be read is updated by the DAQ system at random times, so whatever solution is implemented, I wouldn't want the file to be corrupted (e.g. if the file is read and written at the same time).
Thanks for any help

Read data from file at regular specified intervals,
display data in an applet.
U can use java.util.Timer and TimerTask and schedule the task.
for applets to read file, you may have have to sign the applet.
public class ReadApplet{
private Timer timer;
private TimerTask tt;
private JTextField tf;
public void init(){
tf=new JTextField(15);
timer=new Timer();
tt = new TimerTask(){
public void run(){
try{
BufferedReader fr=new BufferedReader(new FileReader(datafile));
String data = br.readLine();
int num = Integer.parseInt( data);
tf.setText("" + num);
}catch(Exception e) {}
timer.schedule( tt, 0, interval);
- create a jar file containing the class file
- generate a key using keytool -genkey
- sign the applet jar with jarsigner -signedjar using your key
-include applet code in html file
<applet code="Yourapplet.class" ARCHIVE="your signed jar" width="" height=""></applet>
It should work

Need help with java applet

Similar Messages

Maybe you are looking for