I need help in establishing a smale applet

Pleaze i need help in creating this small program. any one can help me pleaze.
All what is required is to write a java applet, that does the following:
1) Creates an empty file on the client side. The name of the file is given
by the client user.
2) Reads a file (example: c:\tmp\toto.txt) from the client side. The name
of the file is given by the client user. If the file does not exist, the
applet should display a message error �File does not exist�.
pleaze help me in thaaaaaat :(

Applets cannot access client files by default: In order to do either of these you will need to sign your applet. Google for applet signing and see what you find.

Similar Messages

Need help in establishing the connection between BO federator and Oracle DB

Hi Experts,
I am working on BO federator and now I need to establish the connection between BO federator and the oracle db to use this as the source for the federator,
I know we need to download the respective oracle DB connect .jar file from the oracle web site and place it under the drivers section(folder) of the BO Federator.
Now I need to understand what is/are the next steps I need to follow and what are the values for the following parameters which are required during establishing the connectivity while creation of data sources from federator end.
Host Name:
Port:
SID:
Schema:
Please share the details, any help will be highly appreciated.
Thanks with regards,
Vinay

Hi,
Please find below details.
Host Name: Server Name or IP Address (Oracle)
Port: (oracle Server Port)
SID:SID is a unique name for an Oracle database instance. -> To switch between Oracle databases, users must specify the desired SID <-. The SID is included in the CONNECT DATA parts of the connect descriptors in a TNSNAMES.ORA file
Schema: no need to enter(Blank)
Thanks,
Amit

Need help with bufferstrategy in a applet

im getting the following errors that its not public in class component
but in the api it says it's public heres the error.
can anyone help ?
heres the code and error
import java.awt.*;
import java.applet.*;
import java.awt.event.*;
import java.awt.image.*;
//implements Runnable,KeyListener,MouseListener,MouseMotionListener
public class memImgSrcApplet extends Applet
MemoryImageSource producerobj;
Image img;
boolean done = false;
int w,h,cx,cy;long nofloops =0;
int [] pixels;
DirectColorModel colorModel;
MemoryImageSource source;
BufferStrategy strategy;
public void init(){
   System.out.println(" init " );
   GraphicsDevice device = GraphicsEnvironment.getLocalGraphicsEnvironment().getDefaultScreenDevice();
   //setUndecorated(true);// knock out bars and stuff
   setIgnoreRepaint(true);// ignore automatic repaint.
   show();//show fullscreen.
    w = getSize().width;h = getSize().height;
    pixels = new int[w * h];
    colorModel = new DirectColorModel(32, 0x00FF0000, 0x0000FF00, 0x000000FF,0);
    source = new MemoryImageSource(w, h, colorModel, pixels, 0, w);
    source.setAnimated(true);
    Image img = createImage(source);
    createBufferStrategy(2);
    strategy = this.getBufferStrategy();
public void run(){
   System.out.println(" run " );
   int j =0;
   long t = System.currentTimeMillis();
   while(j < 1000){
   j++;
   for (int n=pixels.length; --n>=0;){ pixels[n] = n+j;}
   source.newPixels();
   Graphics g = strategy.getDrawGraphics();
   g.drawImage(img, 0, 0, null);
   strategy.show();
   System.out.println(" 1000 frames in milliseconds elapsed "+(System.currentTimeMillis()-t)+" seconds "+(System.currentTimeMillis()-t)/1000f );
   System.out.println(" fps "+( 1000f/ ((System.currentTimeMillis()-t) /1000f )) );
public void start(){
System.out.println(" start " );
public void stop(){
System.out.println(" stop " );
     //public void paint(Graphics g){System.out.println(" paint " );}
}     C:\myjava\documents downloaded\fullscreen\memImgSrcApplet.java:30: createBufferStrategy(int) is not public in java.awt.Component; cannot be accessed from outside package
createBufferStrategy(2);
^
C:\myjava\documents downloaded\fullscreen\memImgSrcApplet.java:31: getBufferStrategy() is not public in java.awt.Component; cannot be accessed from outside package
strategy = this.getBufferStrategy();
^
Note: C:\myjava\documents downloaded\fullscreen\memImgSrcApplet.java uses or overrides a deprecated API.
Note: Recompile with -deprecation for details.
2 errors
Exit code: 1
There were errors
and i have no idea why im geting the depreciation note

I think if you use BufferStrategy in an Applet, you have to do it on a Canvas and add the Canvas to the Applet. I'll have to check to make sure.

Need help reading file directory from applet!

Hi i am writing a java applet which has to read in several text files from its codebase directory. I have this code at the moment which causes a nullpointerexception:
public void initTables()
        File dir = new File(getCodeBase().getPath());
        File[] files = dir.listFiles();
        for (int i = 0; i < files.length; i++)//null pointer here
            String fileName = files.getName();
if(fileName.endsWith("set.txt"))
fileName = fileName.substring(0, (fileName.length() - 4));
Table t = new Table(this, fileName);
}Anybody know whats going on here?
thanks

Sorry i thought it was a null pointer, it's actually this:
java.security.AccessControlException: access denied (java.io.FilePermission C:\Users\Emud\Documents\pokemon read)
     at java.security.AccessControlContext.checkPermission(Unknown Source)
     at java.security.AccessController.checkPermission(Unknown Source)
     at java.lang.SecurityManager.checkPermission(Unknown Source)
     at java.lang.SecurityManager.checkRead(Unknown Source)
     at java.io.File.list(Unknown Source)
     at java.io.File.listFiles(Unknown Source)
     at Gui.initTables(Gui.java:75)
     at Gui.init(Gui.java:16)
     at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)
Exception: java.security.AccessControlException: access denied (java.io.FilePermission C:\Users\Emud\Documents\pokemon read)
yeah, i'm making a program about pokemon...cos i'm cool 8)

Beginner needs help with inserting images in applet.

// Name: Sachit Harish
// Name of Program: HorseRacing
// Date Started: May 15, 2003
// Date Finished: 2003
// Program Description:
import java.awt.*;
import java.applet.*;
public class HorseRacing extends Applet
//     Button startGameButton;
     InputField betAmountBox;
     Image redHorse; //<---------//
//     Button[] drawings = new Button[4];
//    String[] labels = {"Face", "Cheese", "Stick", "Mashed Potatoes"};
    // Method Name: init()
    // Parameters Passed: None
    // Data Returned: None
    // Method Purpose: Where we initialise the InputBoxes and colors.
    public void init()
      //     startGameButton=new Button("Click to Start Game");
      //     add(startGameButton);
      /* for(int i=0; i<drawings.length; i++)
             drawings=new Button (labels[i]);
     add(drawings[i]);
inputBoxes();
setBackground(Color.gray); //background color
setForeground(Color.black); //input field text color
redHorse = getImage(getCodeBase(), "horse_red.GIF"); //<---------//
// Method Name: paint()
// Parameters Passed: Graphics variable screen
// Data Returned: None
// Method Purpose: Where the programs calls and collects all the methods.
//                         If high and low are not integers, an error message
//                         appears.
public void paint(Graphics screen)
     //screen.drawString("HORSE RACES!!!!!", 40,60);
     //startGameButton.move(50,300);
     betAmountBox.setPosition(115,200);
     startGame();
     if(betAmountBox.isInt())
          int betAmount=getBetAmount();
     else
screen.drawString("ERROR: You have not entered an Integer!", 10,110);
screen.drawString(" Please correct your mistake.", 40,125);
     /*int xPos=10;
     int yPos=10;
     for(int i=0; i<drawings.length; i++)
          drawings[i].move(xPos,yPos);
          xPos+=60;
     screen.drawString("Click each button and get a surprise!", 10,50);*/
// Method Name: inputBoxes()
// Parameters Passed: None
// Data Returned: None
// Method Purpose: Where we initialise the inputboxes, set the size of
// the InputField and adds it to the screen. Also
// initialises the InputField to start with 1's
void inputBoxes()
betAmountBox = new InputField(5);
add(betAmountBox);
betAmountBox.initialise(50);
// Method Name: getBetAmount()
// Parameters Passed: Variable number
// Data Returned: None
// Method Purpose: Returns the variable number back to the paint()
int getBetAmount()
int betAmount=betAmountBox.toInt();
return betAmount;
// Method Name: action()
// Parameters Passed: Event variable evt, Object varible obj
// Data Returned: Variable true
// Method Purpose: This block responds when the user takes an action
// (such as hitting the return key). It causes the paint
// block to be done again
public boolean action(Event evt, Object arg)
Graphics screen=getGraphics();
if(evt.target instanceof Button)
     if(arg=="Click to Start Game")
          screen.clearRect(0,0,600,600);
          startGame();
/*if(evt.target instanceOf Button)
               if(arg=="Face")
                    screen.clearRect(5,55,400,400);
                    faceDrawing();
               else if (arg=="Cheese")
                    screen.clearRect(5,55,400,400);
                    cheeseDrawing();
               else if (arg=="Stick")
                    screen.clearRect(5,55,400,400);
                    stickDrawing();
               else if (arg=="Mashed Potatoes")
                    screen.clearRect(5,55,400,400);
                    potatoeDrawing();
return true;
void startGame()
Graphics screen=getGraphics();
          //Horse Racing Box
          screen.drawRect(10,10,505,120);
          screen.drawLine(60,10,60,130);
          screen.drawLine(10,40,515,40);
          screen.drawLine(10,70,515,70);
          screen.drawLine(10,100,515,100);
          screen.setColor(Color.red);
          screen.fillRect(11,11,49,29);
          screen.setColor(Color.yellow);
          screen.fillRect(11,41,49,29);
          screen.setColor(Color.blue);
          screen.fillRect(11,71,49,29);
          screen.setColor(Color.orange);
          screen.fillRect(11,101,49,29);
          screen.setColor(Color.black);
          //Betting Box
          screen.drawRect(10,150,280,100);
          screen.drawLine(10,185,290,185);
          screen.drawLine(80,150,80,185);
          screen.drawLine(150,150,150,185);
          screen.drawLine(220,150,220,185);
          screen.setColor(Color.red);
          screen.fillRect(11,151,69,34);
          screen.setColor(Color.yellow);
          screen.fillRect(81,151,69,34);
          screen.setColor(Color.blue);
          screen.fillRect(151,151,69,34);
          screen.setColor(Color.orange);
          screen.fillRect(221,151,69,34);
          screen.setColor(Color.black);
          screen.drawString("BET = ", 40,230);
screen.drawImage(redHorse, 200,200,300,300,this); //<---------//
The picture an't showing up... why? First time trying to insert images. (I made arrows where I did stuff with the image.)
-sachit

BTW, ignore the buttons and stuff. I just quickly grabbed this file from an earlier button program. :p
-sachit

TS1277 I cannot remember my security question answer to authorize my new computer. Need help to get past this.

I cannot remember my security question answers to authorize my new computer. Need help to establish new ones or find the answers to the originals.
Thanks for any help on this.

Click here for information. If you can't get the answers emailed to you for some reason, contact the iTunes Store staff via the link in that article.
(76299)

A Menu Applet Project (need help)

The Dinner Menu Applet
I would need help with those codes ...
I have to write a Java applet that allows the user to make certain choices from a number of options and allows the user to pick three dinner menu items from a choice of three different groups, choosing only one item from each group. The total will change as each selection is made.
Please send help at [email protected] (see the codes of the project at the end of that file... Have a look and help me!
INSTRUCTIONS
Design the menu program to include three soups, three
entrees, and three desserts. The user should be informed to
choose only one item from each group.
Use the following information to create your project.
Clam Chowder 2.79
Vegetable soup 2.99
Peppered Chicken Broth 2.49
Chicken 12.79
Fish 10.99
Beef 14.99
Vanilla Ice Cream 2.79
Rice Pudding 2.99
Cheesecake 4.29
The user shouldn�t be able to choose more than one item
from the same group. The item prices shouldn�t be visible to
the user.
When the user makes his or her first choice, the running
total at the bottom of the applet should show the price of
that item. As each additional item is selected, the running
total should change to reflect the new total cost.
The dinner menu should be 200 pixels wide &#56256;&#56437; 440 pixels
high and be centered on the browser screen. The browser
window should be titled �The Menu Program.�
Use 28-point, regular face Arial for the title �Dinner Menu.�
Use 16-point, bold face Arial for the dinner menu group titles
and the total at the bottom of the applet. Use 14-point regular
face Arial for individual menu items and their prices. If you
do not have Arial, you may substitute any other sans-serif
font in its place. Use Labels for the instructions.
The checkbox objects will use the system default font.
Note: Due to complexities in the way that Java handles
numbers and rounding, your price may display more than
two digits after the decimal point. Since most users are used
to seeing prices displayed in dollars and cents, you�ll need to
display the correct value.
For this project, treat the item prices as integers. For example,
enter the price of cheesecake as 429 instead of 4.29. That
way, you�ll get an integer number as a result of the addition.
Then, you�ll need to establish two new variables in place of
the Total variable. Run the program using integers for the
prices, instead of float variables with decimals.
You�ll have the program perform two mathematical functions
to get the value for the dollars and cents variables. First,
divide the total price variable by 100. This will return a
whole value, without the remainder. Then get the mod of the
number versus 100, and assign this to the cents variable.
Finally, to display the results, write the following code:
System.out.println("Dinner Price is $ " + dollars +"." + cents);
Please send code in notepad or wordpad to [email protected]
Here are the expectations:
HTML properly coded
Java source and properly compiled class file included
Screen layout as specified
All menu items properly coded
Total calculates correctly
* MenuApplet.java
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
* @author Rulx Narcisse
     E-mail address: [email protected]
public class MenuApplet extends java.applet.Applet implements ItemListener{
//Variables that hold item price:
int clamChowderPrice= 279;
int vegetableSoupPrice= 299;
int pepperedChickenBrothPrice= 249;
int chickenPrice= 1279;
int fishPrice= 1099;
int beefPrice= 1499;
int vanillaIceCreamPrice= 279;
int ricePuddingPrice= 299;
int cheeseCakePrice =429;
int dollars;
int cents=dollars % 100;
//cents will hold the modulus from dollars
Label entete=new Label("Diner Menu");
Label intro=new Label("Please select one item from each category");
Label intro2=new Label("your total will be displayed below");
Label soupsTrait=new Label("Soups---------------------------");
Label entreesTrait=new Label("Entrees---------------------------");
Label dessertsTrait=new Label("Desserts---------------------------");
*When the user makes his or her first choice, the running
     total (i.e. dollars) at the bottom of the applet should show the price of
     that item. As each additional item is selected, the running
     total should change to reflect the new total cost.
Label theDinnerPriceIs=new Label("Dinner Price is $ "+dollars +"."+cents);
*Crating face, using 28-point, regular face Arial for the title �Dinner Menu.�
     Using 16-point, bold face Arial for the dinner menu group titles
     and the total at the bottom of the applet & using 14-point regular
     face Arial for individual menu items and their prices.
Font bigFont = new Font ("Arial", Font.PLAIN,28);
Font bigFont2 = new Font ("Arial", Font.BOLD,16);
Font itemFont = new Font ("Arial", Font.PLAIN,14);
//Here are the radiobutton on the applet...
CheckboxGroup soupsG = new CheckboxGroup();
    Checkbox cb1Soups = new Checkbox("Clam Chowder", soupsG, false);
    Checkbox cb2Soups = new Checkbox("Vegetable Soup", soupsG, true);
    Checkbox cb3Soups = new Checkbox("Peppered Chicken Broth", soupsG, false);
CheckboxGroup entreesG = new CheckboxGroup();
    Checkbox cb1Entrees= new Checkbox("Chicken", entreesG, false);
    Checkbox cb2Entrees = new Checkbox("Fish", entreesG, true);
    Checkbox cb3Entrees = new Checkbox("Beef", entreesG, false);
CheckboxGroup dessertsG = new CheckboxGroup();
    Checkbox cb1Desserts= new Checkbox("Vanilla Ice Cream", dessertsG, false);
    Checkbox cb2Desserts = new Checkbox("Pudding Rice", dessertsG, true);
    Checkbox cb3Desserts = new Checkbox("Cheese Cake", dessertsG, false);
    public void init() {
        entete.setFont(bigFont);
        add(entete);
        intro.setFont(itemFont);
        add(intro);
        intro2.setFont(itemFont);
        add(intro2);
        soupsTrait.setFont(bigFont2);
        add(soupsTrait);
        cb1Soups.setFont(itemFont);cb2Soups.setFont(itemFont);cb3Soups.setFont(itemFont);
        add(cb1Soups); add(cb2Soups); add(cb3Soups);
        cb1Soups.addItemListener(this);cb2Soups.addItemListener(this);cb2Soups.addItemListener(this);
        entreesTrait.setFont(bigFont2);
        add(entreesTrait);
        cb1Entrees.setFont(itemFont);cb2Entrees.setFont(itemFont);cb3Entrees.setFont(itemFont);
        add(cb1Entrees); add(cb2Entrees); add(cb3Entrees);
        cb1Entrees.addItemListener(this);cb2Entrees.addItemListener(this);cb2Entrees.addItemListener(this);
        dessertsTrait.setFont(bigFont2);
        add(dessertsTrait);
        cb1Desserts.setFont(itemFont);cb2Desserts.setFont(itemFont);cb3Desserts.setFont(itemFont);
        add(cb1Desserts); add(cb2Desserts); add(cb3Desserts);
        cb1Desserts.addItemListener(this);cb2Desserts.addItemListener(this);cb2Desserts.addItemListener(this);
        theDinnerPriceIs.setFont(bigFont2);
        add(theDinnerPriceIs);
       public void itemStateChanged(ItemEvent check)
           Checkbox soupsSelection=soupsG.getSelectedCheckbox();
           if(soupsSelection==cb1Soups)
               dollars +=clamChowderPrice;
           if(soupsSelection==cb2Soups)
               dollars +=vegetableSoupPrice;
           else
               cb3Soups.setState(true);
           Checkbox entreesSelection=entreesG.getSelectedCheckbox();
           if(entreesSelection==cb1Entrees)
               dollars +=chickenPrice;
           if(entreesSelection==cb2Entrees)
               dollars +=fishPrice;
           else
               cb3Entrees.setState(true);
           Checkbox dessertsSelection=dessertsG.getSelectedCheckbox();
           if(dessertsSelection==cb1Desserts)
               dollars +=vanillaIceCreamPrice;
           if(dessertsSelection==cb2Desserts)
               dollars +=ricePuddingPrice;
           else
               cb3Desserts.setState(true);
            repaint();
    }

The specific problem is that when I load he applet, the radio buttons do not work properly and any calculation is made.OK.
I had a look at the soup radio buttons. I guess the others are similar.
(a) First, a typo.
cb1Soups.addItemListener(this);cb2Soups.addItemListener(this);cb2Soups.addItemListener(this);That last one should be "cb3Soups.addItemListener(this)". The peppered chicken broth was never responding to a click. It might be a good idea to write methods that remove such duplicated code.
(b) Now down where you respond to user click you have:
Checkbox soupsSelection=soupsG.getSelectedCheckbox();
if(soupsSelection==cb1Soups)
    dollars +=clamChowderPrice;
if(soupsSelection==cb2Soups)
    dollars +=vegetableSoupPrice;
else
    cb3Soups.setState(true);What is that last bit all about? And why aren't they charged for the broth? Perhaps it should be:
Checkbox soupsSelection=soupsG.getSelectedCheckbox();
if(soupsSelection==cb1Soups) {
    dollars +=clamChowderPrice;
} else if(soupsSelection==cb2Soups) {
    dollars +=vegetableSoupPrice;
} else if(soupsSelection==cb3Soups) {
    dollars +=pepperedChickenBrothPrice;
}Now dollars (the meal price in cents) will have the price of the soup added to it every time.
(c) It's not enough to just calculate dollars, you also have to display it to the user. Up near the start of your code you have
Label theDinnerPriceIs=new Label("Dinner Price is $ "+dollars +"."+cents);It's important to realise that theDinnerPriceIs will not automatically update itself to reflect changes in the dollars and cents variables. You have to do this yourself. One way would be to use the Label setText() method at the end of the itemStateChanged() method.
(d) Finally, the way you have written itemStateChanged() you are continually adding things to dollars. Don't forget to make dollars zero at the start of this method otherwise the price will go on and on accumulating which is not what you intend.
A general point: If you have any say in it use Swing (JApplet) rather than AWT. And remember that both Swing and AWT have forums of their own which may be where you get the best help for layout problems.

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 Stick Figure Applet

I need help with this java program for college....we need to make a applet which displays a stick figure or some type of person using appleviewer..please can someone help me......
email: [email protected]

import java.awt.*;
import java.applet.*;
public class StickMan extends Applet {
     public void init() {
     public void paint(Graphics g) {
          g.drawOval(....);
          g.drawLine(....);
          g.drawLine(....);
          g.drawLine(....);
          g.drawLine(....);

I need help with the Quote applet.

Hey all,
I need help with the Quote applet. I downloaded it and encoded it in the following html code:
<html>
<head>
<title>Part 2</title>
</head>
<body>
<applet      codebase="/demo/quote/classes" code="/demo/quote/JavaQuote.class"
width="300" height="125" >
<param      name="bgcolor"      value="ffffff">
<param      name="bheight"      value="10">
<param      name="bwidth"      value="10">
<param      name="delay"      value="1000">
<param      name="fontname"      value="TimesRoman">
<param      name="fontsize"      value="14">
<param      name="link"      value="http://java.sun.com/events/jibe/index.html">
<param      name="number"      value="3">
<param      name="quote0"      value="Living next to you is in some ways like sleeping with an elephant. No matter how friendly and even-tempered is the beast, one is affected by every twitch and grunt.|- Pierre Elliot Trudeau|000000|ffffff|7">
<param      name="quote1"      value="Simplicity is key. Our customers need no special technology to enjoy our services. Because of Java, just about the entire world can come to PlayStar.|- PlayStar Corporation|000000|ffffff|7">
<param      name="quote2"      value="The ubiquity of the Internet is virtually wasted without a platform which allows applications to utilize the reach of Internet to write ubiquitous applications! That's where Java comes into the picture for us.|- NetAccent|000000|ffffff|7">
<param      name="space"      value="20">
</applet>
</body>
</html>When I previewed it in Netscape Navigator, a box with a red X appeared, and this appeared in the console when I opened it:
load: class /demo/quote/JavaQuote.class not found.
java.lang.ClassNotFoundException: .demo.quote.JavaQuote.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.FileNotFoundException: \demo\quote\JavaQuote\class.class (The system cannot find the path specified)
     at java.io.FileInputStream.open(Native Method)
     at java.io.FileInputStream.<init>(Unknown Source)
     at java.io.FileInputStream.<init>(Unknown Source)
     at sun.net.www.protocol.file.FileURLConnection.connect(Unknown Source)
     at sun.net.www.protocol.file.FileURLConnection.getInputStream(Unknown Source)
     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-4" 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)What went wrong? and how can I make it run correct?
Thanks,
Nathan Pinno

JavaQuote.class is not where your HTML says it is. That is at the relative URL "/demo/quote/".

Partial Get via IE Browser/applet failing ... need help !?

Partial Get via IE Browser/applet failing ... need help !?
I recall someone saying that IE client would not receive a partial get initiated by http URL with setRequestProperty("range","bytes=2-");
Can anyone elaborate on why the client seems to balk at the returned result and the getinputStream seems to result in a FileNotFoundException
Do I have to use sockets ??????

Partial Get via IE Browser/applet failing ... need help !?
I recall someone saying that IE client would not receive a partial get initiated by http URL with setRequestProperty("range","bytes=2-");
Can anyone elaborate on why the client seems to balk at the returned result and the getinputStream seems to result in a FileNotFoundException
Do I have to use sockets ??????

Need help with applet servlet communication .. not able to get OutputStream

i am facing problem with applet and servlet communication. i need to send few image files from my applet to the servlet to save those images in DB.
i need help with sending image data to my servlet.
below is my sample program which i am trying.
java source code which i am using in my applet ..
public class Test {
    public static void main(String argv[]) {
        try {
                URL serverURL = new URL("http://localhost:8084/uploadApp/TestServlet");
                URLConnection connection = serverURL.openConnection();
                Intermediate value=new Intermediate();
                value.setUserId("user123");
                connection.setDoInput(true);
                connection.setDoOutput(true);
                connection.setUseCaches(false);
                connection.setDefaultUseCaches(false);
                // Specify the content type that we will send binary data
                connection.setRequestProperty ("Content-Type", "application/octet-stream");
                ObjectOutputStream outputStream = new ObjectOutputStream(connection.getOutputStream());
                outputStream.writeObject(value);
                outputStream.flush();
                outputStream.close();
            } catch (MalformedURLException ex) {
                System.out.println(ex.getMessage());
            } catch (IOException ex) {
                    System.out.println(ex.getMessage());
}servlet code here ..
public class TestServlet extends HttpServlet {
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
         System.out.println(" in servlet -----------");
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        ObjectInputStream inputFromApplet = null;
        Intermediate aStudent = null;
        BufferedReader inTest = null;
        try {
            // get an input stream from the applet
            inputFromApplet = new ObjectInputStream(request.getInputStream());
            // read the serialized object data from applet
            data = (Intermediate) inputFromApplet.readObject();
            System.out.println("userid in servlet -----------"+ data.getUserId());
            inputFromApplet.close();
        } catch (Exception e) {
            e.printStackTrace();
            System.err.println("WARNING! filename.path JNDI not found");
        } finally {
            out.close();
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        System.out.println(" in foGet -----------");
        processRequest(request, response);
     * Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        System.out.println(" in doPost -----------");
        processRequest(request, response);
     * Returns a short description of the servlet.
     * @return a String containing servlet description
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>
}the Intermediate class ..
import java.io.Serializable;
public class Intermediate implements Serializable{
String userId;
    public String getUserId() {
        return userId;
    public void setUserId(String userId) {
        this.userId = userId;
}

Hi,
well i am not able to get any value from connection.getOutputStream() and i doubt my applet is not able to hit the servlet. could you review my code and tell me if it has some bug somewhere. and more over i want to know how to send multiple file data from applet to servlet . i want some sample or example if possible.
do share if you have any experience of this sort..
Thanks.

Need help with Applet: Images

DUKESTARS HERE, YOU KNOW YOU WANNA
Hi,
I'm designing an applet for some extra credit and I need help.
This game that i have designed is called "Digit Place Game", but there is no need for me to explain the rules.
The problem is with images.
When I start the game using 'appletviewer', it goes to the main menu:
http://img243.imageshack.us/img243/946/menuhy0.png
Which is all good.
But I decided that when you hover your cursor over one of the options such as: Two-Digits or Three-Digits, that the words that are hovered on turn green.
http://img131.imageshack.us/img131/6231/select1ch3.png
So i use the mouseMoved(MouseEvent e) from awt.event;
The problem is that when i move the mouse around the applet has thick line blotches of gray/silver demonstrated below (note: these are not exact because my print screen doesn't take a picture of the blotches)
http://img395.imageshack.us/img395/4974/annoyingmt1.png
It also lags a little bit.
I have 4 images in my image folder that's in the folder of the source code
The first one has all text blue. The second one has the first option, Two-Digits green but rest blue. The third one has the second option, Three-Digits green but rest blue, etc.
this is my code
import java.applet.Applet;
import java.awt.Graphics;
import java.awt.event.*;
import java.awt.*;
public class DigitPlaceGame extends Applet implements MouseListener, MouseMotionListener {
     public boolean load = false;
     public boolean showStartUp = false;
     public boolean[] hoverButton = new boolean[3];
     Image load1;
     Image showStartUp1;
     Image showStartUp2;
     Image showStartUp3;
     Image showStartUp4;
     public void init() {
          load = true;
          this.resize(501, 501);
               try {
                    load1 = getImage(getCodeBase(), "images/load1.gif");
                    repaint();
               } catch (Exception e) {}
          load();
     public void start() {
     public void stop() {
     public void destroy() {
     public void paint(Graphics g) {
          if(load == true) {
               g.drawImage(load1, 0, 0, null, this);
          } else if(showStartUp == true) {
               if(hoverButton[0] == true) {
                    g.drawImage(showStartUp2, 0, 0, null, this);
               } else if(hoverButton[1] == true) {
                    g.drawImage(showStartUp3, 0, 0, null, this);
               } else if(hoverButton[2] == true) {
                    g.drawImage(showStartUp4, 0, 0, null, this);
               } else {
                    g.drawImage(showStartUp1, 0, 0, null, this);
                    for(int i = 0; i < 3; i++) {
                         hoverButton[i] = false;
     public void load() {
          addMouseListener(this);
          addMouseMotionListener(this);
          showStartUp1 = getImage(getCodeBase(), "images/showStartUp1.gif");
          showStartUp2 = getImage(getCodeBase(), "images/showStartUp2.gif");
          showStartUp3 = getImage(getCodeBase(), "images/showStartUp3.gif");
          showStartUp4 = getImage(getCodeBase(), "images/showStartUp4.gif");
          showStartUp();
     public void showStartUp() {
          load = false;
          showStartUp = true;
     public void mouseClicked(MouseEvent e) {
          System.out.println("test");
     public void mouseMoved(MouseEvent e) {
          int x = e.getX();
          int y = e.getY();
          if(x >= 175 && x <= 330 && y >= 200 && y <= 235) {
               hoverButton[0] = true;
               repaint();
          } else if(x >= 175 && x <= 330 && y >= 250 && y <= 280) {
               hoverButton[1] = true;
               repaint();
          } else if(x >= 175 && x <= 330 && y >= 305 && y <= 335) {
               hoverButton[2] = true;
               repaint();
          } else {
                    for(int i = 0; i < 3; i++) {
                         hoverButton[i] = false;
                    repaint();
     public void mouseEntered(MouseEvent e) {
     public void mouseExited(MouseEvent e) {
     public void mousePressed(MouseEvent e) {
     public void mouseReleased(MouseEvent e) {
     public void mouseDragged(MouseEvent e) {
}plox help me ploz, i need the extra credit for an A
can you help me demolish the lag and stop the screen from flickering? thanks!!!!!
BTW THIS IS EXTRA CREDIT NOT HOMework
DUKESTARS HERE, YOU KNOW YOU WANNA
Edited by: snoy on Nov 7, 2008 10:51 PM
Edited by: snoy on Nov 7, 2008 10:53 PM

Oh yes, I knew there could be some problem.......
Now try this:
boolean a,b,c;
if((a=(x >= 175 && x <= 330 && y >= 200 && y <= 235)) && !hoverButton[0]) {
               hoverButton[0] = true;
               repaint();
          } else if((b=(x >= 175 && x <= 330 && y >= 250 && y <= 280)) && !hoverButton[1]) {
               hoverButton[1] = true;
               repaint();
          } else if((c=(x >= 175 && x <= 330 && y >= 305 && y <= 335)) && !hoverButton[2]) {
               hoverButton[2] = true;
               repaint();
          } else if ((!a && !b && !c)&&(hoverButton[0] || hoverButton[1] || hoverButton[2]){
                    for(int i = 0; i < 3; i++) {
                         hoverButton[i] = false;
                    repaint();
          }hope it works........
Edited by: T.B.M on Nov 8, 2008 10:41 PM

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 coding simple applet program

Hello I'm attempting to learn applet programming in either swing or awt. Whichever is best for current applications. I want to begin by creating my first hello world application. I want to create a simple applet that has two buttons, press button number one and the text "hello world 1" comes up somewhere on the applet, press two and "hello world 2" comes up. can anyone help me with this simple applet? Thnx in advance

http://java.sun.com/docs/books/tutorial/applet/

I need help in establishing a smale applet

Similar Messages

Maybe you are looking for