Need help with Java GUI

I'm a bit unfamiliar with the features of the Java GUI which I'm using for an online game I'm making. Specifically, I can't move around the different components the way I want to. I want to have my game on one frame, but made up of 3 different parts. The top half will be the the actual game where the images are displayed, then below that will be a scroll pane to show all the messages the player has received, and the bottom part will be a text field so the player can send messages. I have the text field and scroll pane working, but the problem is that the scroll pane takes up the entire screen (except for the text field) and I can't find any way to resize it and move it to the bottom, just above the text screen, the way I want it to be. I'm using JTextField for the text field, and JDisplayArea and JScrollPane for the scroll pane.
Here are two images in case you can't visualize what I am saying. This is what it looks like now:
http://img127.imageshack.us/img127/1294/beforeob1.jpg
And this is how it should be:
http://img127.imageshack.us/img127/8724/aftedzu7.jpg
Help would be greatly appreciated. Thanks in advance.

Does the class that implement your game panel provide a meaningful return value for the method "getPreferredSize()"? I guess you use a BorderLayout, don't you? In this case the game panel isn't visible because it doesn't tell the LayoutManager what size it wants and so it gets a 0,0 size.
Greetings
Stefan

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Need help with java

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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)
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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
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[4 marks] In the following space, define a function, Print, that takes two parameters, Title and
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My World (30)
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This forum is for Java, not JavaScript. The two have nothing to do with each other.
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Need help with java J2Se 5.0 upgrade 2

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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)".
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Need help with Java always get error

hey guys need help
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I go to certain websites and I get this error with firefox.
This Site requires that JavaScript be enabled.
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Error: [Exception... "'Component does not have requested interface' when calling method: [nsIInterfaceRequestor::getInterface]" nsresult: "0x80004002 (NS_NOINTERFACE)" location: "<unknown>" data: no]
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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:
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Do I need both of these installed? If not, which should I uninstall?
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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

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Requirements for Lab.
You will need to develop a variety of classes for this lab. Specifically, you need to create:
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+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).+
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Your main Lab6 class should provide a means for the user to:
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Your program should validate numeric data to the extent:
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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

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

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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
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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:"?

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Need Help with Java Homework

This is my first post here, seeking some help with my java homework. I am required to create a program to write out a receipt for a pizza company: name of company, total number of pizzas, costs (including tax etc), and print out the receipt after taking an order from the customer.
This is a beginner's java class and my book isn't very good at explaining (mainly because it says "will be discussed in ch 14" when we're in ch 1-3 and it's an essential part of the program).
But anyways, if anyone is up right now, would be helpful for some help. I have a general idea of what I wanna do, but the program so far is very messy and incomplete and having trouble getting it to look nice and proper.

well there were two ways of doing this, im only 2 weeks new in java so bear with me.....I was gonna set 3 classes, one appclass, one order form, and one receipt. I was told you can combine the order and receipt in 1 class, but I thought doing 3 woudl be better to help me learn more...anyways, I haven't worked on the appclass yet, but for the order I have a very messy set of codes. I know that it's wrong but it's a start, im looking for any input cause the book does not explain very much.
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* @author AlexNguyen
* To take the order with number of pizzas and toppings
package project2;
import javax.swing.JOptionPane;
public class Order {
     public int NumberOfPizzas;
     public char Pepperoni;
     public char Sausage;
     public char Cheese;
     public Order(int n) {
     NumberOfPizzas = n;
     JOptionPane.showInputDialog("Enter Number of Pizzas"));
String ptype; {
     public void start();
     public void takeOrder();
     public void writeReceipt();
          public void takeOrder();
          ptype = Topping
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public void numPizza(int numberOfPizzas) {
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JOptionPane.showInputDialog("Topping for Pizza?");
JOptionPane.showInputDialog("Pizza Size?");
JOptionPane.showInputDialog("Number of Pizzas?");
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New @ RMI need help with java.rmi.UnmarshalException: error unmarshalling

Hi @ all out there,
I'm new with Java RMI and have to write a EventSystem for an college project where clients can subscribe to a topic and get notified when someone publishes a message to the subscribed topic.
At server-side I have a class called EventSystem that provides methods for subscribing and unsubscribing from topics, and also for posting messages (for publishers).
To subscribe i thought that the client must specify the topic and also itself ( means that a client calls in this way: obj.subscribe("mytopic", this).
The EventSystem handles a list of all clients, and whenever a new message is posted it goes trough all clients and invokes the handleMessage(String msg) method that all Clients have to provide.
On my local machine without RMi this concept works just great.
I now tried to get it working using RMI , but I get the following Exception when starting the client (the server starts fine) :
Looking up for rmiregistry at 138.232.248.22:1099
Subscriber exception:
java.rmi.ServerException: RemoteException occurred in server thread; nested exception is:
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        at java.security.AccessController.doPrivileged(Native Method)
        at sun.rmi.transport.Transport.serviceCall(Transport.java:155)
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        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
        at java.lang.Thread.run(Thread.java:619)
        at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:255)
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        at java.rmi.server.RemoteObjectInvocationHandler.invoke(RemoteObjectInvocationHandler.java:132)
        at $Proxy0.subscribe(Unknown Source)
        at SubscriberImpl.main(SubscriberImpl.java:48)
Caused by: java.rmi.UnmarshalException: error unmarshalling arguments; nested exception is:
        java.io.InvalidClassException: SubscriberImpl; SubscriberImpl; class invalid for deserialization
        at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:293)
        at sun.rmi.transport.Transport$1.run(Transport.java:159)
        at java.security.AccessController.doPrivileged(Native Method)
        at sun.rmi.transport.Transport.serviceCall(Transport.java:155)
        at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:535)
        at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:790)
        at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:649)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
        at java.lang.Thread.run(Thread.java:619)
Caused by: java.io.InvalidClassException: SubscriberImpl; SubscriberImpl; class invalid for deserialization
        at java.io.ObjectStreamClass.checkDeserialize(ObjectStreamClass.java:713)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1733)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351)
        at sun.rmi.server.UnicastRef.unmarshalValue(UnicastRef.java:306)
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Caused by: java.io.InvalidClassException: SubscriberImpl; class invalid for deserialization
        at java.io.ObjectStreamClass.initNonProxy(ObjectStreamClass.java:587)
        at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1583)
        at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1496)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1732)
        ... 13 moreI googled now for 2 hours but can't resolve the problem alone. As far as I can understand I have to serialize Objects that I want to send to the server, right?
So how can i do this? I've never used serialization till now.
any ideas how to solve this problem?
greets from italy and sorry for my very weak english
bd_italy

A class has been modified after deployment. Stop the Registry, clean, recompile, and redeploy.

I need help with my GUI Photo Album.

Hello! I'm still learning bits about GUI and I need some assistance to make my basic program work. I've searched the forums to look at past Photo Album projects; they didn't help much or maybe I'm overlooking some things. Every time I click the "Next" button the image doesn't change. It may be a simple task to solve, but I'm really stumped! Sorry if it's such a stupid thing to ask. Thanks in advance.
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WafflesNSyrup wrote:
int i = 1;
ImageIcon icon = new ImageIcon("../Images/" + i + ".jpg");
++i;
So I understand that you originally thought incrementing (i) would somehow update (icon) since it uses (i) in an expression. But now you hopefully know this is not a magical expression language.
I bet you would have also thought that this:
int x = 1;
int y = 2;
int z = x + y;
x = 42;
y = 58;would have ended up with z having the value 100? It doesn't. It did the math once, when it executed the expression (x + y) and stored it in the variable (z). So z == 3, regardless of what happens to x or y after the fact.

Need help with a gui

Here's my code:
import java.awt.Dimension;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
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}When Component5 is clicked, i would like it to do this:
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TIA,
Chris

Could you help me with this code, too?
import java.awt.Dimension;
import java.awt.event.*;
import java.net.*;
import java.io.*;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
public class xScriptGUI extends JPanel implements ActionListener {
private JLabel component1;
private JLabel component2;
private static JTextField component3;
private static JPasswordField component4;
private JButton component5;
static String authUsername;
static String authPassword;
public xScriptGUI() {
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    add(component3);
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    add(component5);
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    component2.setBounds(25, 50, 100, 25);
    component3.setBounds(95, 20, 100, 25);
    component4.setBounds(95, 50, 100, 25);
    component5.setBounds(65, 85, 100, 25);
public void actionPerformed(ActionEvent ae) {
    if (ae.getSource()==component5) {
      authUsername = component3.getText();
      // deprecated!
      // authPassword = component4.getText();
      authPassword = new String(component4.getPassword());
      // we have no convenient reference to the frame, so we
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      // instead
      JOptionPane.showMessageDialog(this, authUsername);
      JOptionPane.showMessageDialog(this, authPassword);
     URL url = new URL("http://auth.1337chris.org/xscripts/auth.php?user=" + URLEncoder.encode(authUsername, "UTF-8") + "&pass=" + URLEncoder.encode(authPassword, "UTF-8"));
     BufferedReader in = new BufferedReader(
                    new InputStreamReader(
                    url.openStream()));
     String inputLine;
     while ((inputLine = in.readLine()) != null)
          if (inputLine.equals("0")) {
               JOptionPane.showMessageDialog(this, "Go buy an auth, kid");
          } else if (inputLine.equals("1")) {
               JOptionPane.showMessageDialog(this, "AUTHED");
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      JOptionPane.showMessageDialog(this, "Unknown command!");
public static void main(String[] args) {
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    frame.getContentPane().add(new xScriptGUI());
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}

Need Help With Java Query String

I'm new to Java and I'm passing data via a URL to another page(I'm not using a form). I have been succesfull in decoding the string to return the name value below:
<SCRIPT LANGUAGE="JavaScript">
function decodeSearchString() {
var nameValue = new Array();
var searchStr = unescape(location.search.substring(1));
if (searchStr) {
var formElement = searchStr.split("&");
var tmpArray = new Array();
for (k = 0; k < formElement.length; k++) {
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nameValue[tmpArray[0]] = tmpArray[1];
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</SCRIPT>
However, now I need to add the value returned from the above srcipt to the Java script listed below:
<SCRIPT Language="Javascript" SRC="#srchData.link#?open&pID=PAR"> </SCRIPT>
This above script if working will add the HTML from the URL query to the page, but I keep getting a Java Error with this script. Please Help !

I assume you are using a JSP page and not just solely doing Javascript. IF you are using JSP, then read on. Otherwise, I can revisit your script.
To obtain the value of the query string, you would use a method call such as:
String strQuery = request.getQueryString()
Or, to get a single parameter off the query string, you can call:
String strSearchData = request.getParameter("paramname");
Or, if you want all the parameters and values instead of just one long string you can call:
Enumeration enumParamNames = request.getParameterNames();
You can use the above enumeration in combination with getParameter() to get the values.
In order to build your script line and add the query string, you would then do something like this:
<SCRIPT Language="Javascript" SRC="#<%=strSearchData%>.link#?open&pID=PAR"> </SCRIPT>
Notice the <%= %> block in the above code.
I hope that is what you were looking for. Your example is somewhat confusing so I may have answered wrong.
Mike

Need help with java program

Modify the Inventory Program by adding a button to the GUI that allows the user to move to the first item, the previous item, the next item, and the last item in the inventory. If the first item is displayed and the user clicks on the Previous button, the last item should display. If the last item is displayed and the user clicks on the Next button, the first item
should display. the GUI using Java graphics classes.
? Add a company logo to? Post as an attachment Course Syllabus
here is my code // created by Nicholas Baatz on July 24,2007
import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
public class Inventory2
//main method begins execution of java application
public static void main(final String args[])
int i; // varialbe for looping
double total = 0; // variable for total inventory
final int dispProd = 0; // variable for actionEvents
// Instantiate a product object
final ProductAdd[] nwProduct = new ProductAdd[5];
// Instantiate objects for the array
for (i=0; i<5; i++)
nwProduct[0] = new ProductAdd("Paper", 101, 10, 1.00, "Box");
nwProduct[1] = new ProductAdd("Pen", 102, 10, 0.75, "Pack");
nwProduct[2] = new ProductAdd("Pencil", 103, 10, 0.50, "Pack");
nwProduct[3] = new ProductAdd("Staples", 104, 10, 1.00, "Box");
nwProduct[4] = new ProductAdd("Clip Board", 105, 10, 3.00, "Two Pack");
for (i=0; i<5; i++)
total += nwProduct.length; // calculate total inventory cost
final JButton firstBtn = new JButton("First"); // first button
final JButton prevBtn = new JButton("Previous"); // previous button
final JButton nextBtn = new JButton("Next"); // next button
final JButton lastBtn = new JButton("Last"); // last button
final JLabel label; // logo
final JTextArea textArea; // text area for product list
final JPanel buttonJPanel; // panel to hold buttons
//JLabel constructor for logo
Icon logo = new ImageIcon("C:/logo.jpg"); // load logo
label = new JLabel(logo); // create logo label
label.setToolTipText("Company Logo"); // create tooltip
buttonJPanel = new JPanel(); // set up panel
buttonJPanel.setLayout( new GridLayout(1, 4)); //set layout
// add buttons to buttonPanel
buttonJPanel.add(firstBtn);
buttonJPanel.add(prevBtn);
buttonJPanel.add(nextBtn);
buttonJPanel.add(lastBtn);
textArea = new JTextArea(nwProduct[3]+"\n"); // create textArea for product display
// add total inventory value to GUI
textArea.append("\nTotal value of Inventory "+new java.text.DecimalFormat("$0.00").format(total)+"\n\n");
textArea.setEditable(false); // make text uneditable in main display
JFrame invFrame = new JFrame(); // create JFrame container
invFrame.setLayout(new BorderLayout()); // set layout
invFrame.getContentPane().add(new JScrollPane(textArea), BorderLayout.CENTER); // add textArea to JFrame
invFrame.getContentPane().add(buttonJPanel, BorderLayout.SOUTH); // add buttons to JFrame
invFrame.getContentPane().add(label, BorderLayout.NORTH); // add logo to JFrame
invFrame.setTitle("Office Min Inventory"); // set JFrame title
invFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // termination command
//invFrame.pack();
invFrame.setSize(400, 400); // set size of JPanel
invFrame.setLocationRelativeTo(null); // set screem location
invFrame.setVisible(true); // display window
// assign actionListener and actionEvent for each button
firstBtn.addActionListener(new ActionListener()
public void actionPerformed(ActionEvent ae)
textArea.setText(nwProduct[0]+"\n");
} // end firstBtn actionEvent
}); // end firstBtn actionListener
textArea.setText(nwProduct[4]+"n");
// prevBtn.addActionListener(new ActionListener()
// public void actionPerformed(ActionEvent ae)
// dispProd = (nwProduct.length+dispProd-1) % nwProduct.length;
// textArea.setText(nwProduct.display(dispProd)+"\n");
// } // end prevBtn actionEvent
// }); // end prevBtn actionListener
} // end main
} // end class Inventory2
class Product
protected String prodName; // name of product
protected int itmNumber; // item number
protected int units; // number of units
protected double price; // price of each unit
protected double value; // value of total units
public Product(String name, int number, int unit, double each) // Constructor for class Product
prodName = name;
itmNumber = number;
units = unit;
price = each;
} // end constructor
public void setProdName(String name) // method to set product name
prodName = name;
public String getProdName() // method to get product name
return prodName;
public void setItmNumber(int number) // method to set item number
itmNumber = number;
public int getItmNumber() // method to get item number
return itmNumber;
public void setUnits(int unit) // method to set number of units
units = unit;
public int getUnits() // method to get number of units
return units;
public void setPrice(double each) // method to set price
price = each;
public double getPrice() // method to get price
return price;
public double calcValue() // method to set value
return units * price;
} // end class Product
class ProductAdd extends Product
private String feature; // variable for added feature
public ProductAdd(String name, int number, int unit, double each, String addFeat)
// call to superclass Product constructor
super(name, number, unit, each);
feature = addFeat;
}// end constructor
public void setFeature(String addFeat) // method to set added feature
feature = addFeat;
public String getFeature() // method to get added feature
return feature;
public double calcValueRstk() // method to set value and add restock fee
return units * price * 0.05;
public String toString()
return String.format("Product: %s\nItem Number: %d\nIn Stock: %d\nPrice: $%.2f\nType: %s\nTotal Value of Stock: $%.2f\nRestock Cost: $%.2f\n\n\n",
getProdName(), getItmNumber(), getUnits(), getPrice(), getFeature(), calcValue(), calcValueRstk());
} // end class ProductAddI can not get all the buttons to work and do not know why can someone help me

You have to have your code formatted correctly to begin with before you add the code tags. All your current code is left-justified and is not indented correctly.
I only see that you've added an actionlistener to the "first" button.
I recommend that you:
1) again, do this first in a nonGUI class, then use this nonGUI class in your GUI class.
2) Have a integer variable that holds the location of the current Product that your application is pointing to.
3) Have a method called getProduct(int index) that returns the product that is at the location specified by the index in your array / arraylist / or whatever collection that you are using.
4) Have your first button set index to 0 and then call getProduct(index).
5) Have your last button set your index to the last product in your collection (i.e.: index = productCollection.length - 1 if this is an array), and then call getProduct(index).
5) Have your next button increment your index up to the maximum allowed and then call getProduct(index). If it's an array it goes up to the array length - 1.
6) If you want the next button to cause the index to roll over to the first, when you are at the last then then increment the index and mod it ("%" operator) by the length of the array...

Need help with Java GUI

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