I'm new to Java, you see....
I'm not much of a Java man just yet...but I do know C and C++ very well, and I also am a very at using Macromedia Flash to program any kind of game there is...even 3D (which Flash doesn't support). I've also written a 75 page "book" (tutorial, rather) about programming games in Flash, and how to apply trigonometry, calculus, algebra, and geometry to create games (Like logarithmic level-up systems and parabolic slopes and such).
And now that I've established that I'm not a complete n00b idiot, I have a question or two about Java, regarding the life cycle of an Applet and the flow of execution in an applet. In C/C++, execution begins at main() or WINMAIN(), and runs straight down the line, executing each line of code. My Java applet doesn't seem to do this.
import java.awt.*;
import java.applet.Applet;
public class HelloWorld extends Applet{
public void init(){
//Nothing here.
//Nothing in this function is executed...
public int Bob(Graphics X){
X.drawString("This doesn't print...",0,0);
X.drawRect(150,150, 160, 160);
Color Vermilion=new Color(255,56,0);
X.setColor(Vermilion);
X.fillRect(150,150,160, 160);
return 0;
public void paint (Graphics g){
g.drawRect(0,0,300,150);
g.setColor(Color.RED);
g.fillRect(0,0,300,150);
g.setColor(Color.BLUE);
g.drawString("L33T |-|4x0|25 570|_3 |\/|y |\/|364|-|3|275",25,75);
};�Why does paint execute, even though it's below Bob()? I'm assuming it's because paint() is a method that's important ad such...?
�Also...WHERE is the entry point in a Java program? It would really help to know just where execution starts and ends.
�Why is Java just about 100% classes and OOP? Is there REALLY a need for that? C and C++ do just fine with global functions outside of classes.
�Can Java be used to create (almost) animations of sorts? Which would require one to be able to actually see an object's position be changed over a series of frames rather than having all of the code execute before you can see the object move..
Hey, sorry about all the questions, ya? :cool:
I'm new to this...so I guess it's okay if I have a few questions, right?
Anyhoo, any help would be appreciated. :)
I am short on time right now, so I will only answer one of your questions.
A Java Applet uses the init() method as the entry point to the Applet. If you have an empty init() method, nothing is going to happen.
void init()
Called by the browser or applet viewer to inform this applet that it has been loaded
into the system.A Java application uses the main() mehtod as the entry point. The signature for the main method is:
public static void main( String arguments[] )Applets are started by browsers, applications are started by a JVM startup program (typically, java).
� {�
Similar Messages
-
Which IDE is better for new to Java?
netbeans?eclipse?JB?
well, I'm new to java too , but no to using IDEs,
and my impressions are the following:
Java creator is a great, great tool, but it lacks the
"easiness" of eclipse, it's more focused on the 'web
side' of the Java technology, not too much for the
standalone app creation[IMHO].
Eclipse is great too, but it needs more work in the
GUI 'design time' subject.
Both offer great features, and both have tons and
tons of tutorials for beginners and i think the best
tool is that which makes you feel more comfortable
with it , in my [really really short] experience, i
have used both and honestly, i feel more comfortable
working with eclipse, but i keep using both.
Walter_Rincon
[real name]If you are new to java you should be using a notepad ( or maybe a simple text-editor ) not an IDE! -
Significance of "You need to enable Java to see this applet"
i am a novish for applet programming.
i have written the code for drawing a spectrum.
import java.applet.*;
import java.awt.*;
public class DrawingWithColor1 extends Applet {
int width, height;
int N = 25; // the number of colors created
Color[] spectrum; // an array of elements, each of type Color
Color[] spectrum2; // another array
public void init() {
width = getSize().width;
height = getSize().height;
setBackground( Color.black );
// Allocate the arrays; make them "N" elements long
spectrum = new Color[ N ];
spectrum2 = new Color[ N ];
// Generate the colors and store them in the arrays.
for ( int i = 1; i <= N; ++i ) {
// The three numbers passed to the Color() constructor
// are RGB components in the range [0,1].
// The casting to (float) is done so that the divisions will be
// done with floating point numbers, yielding fractional quotients.
// As i goes from 1 to N, this color goes from almost black to white.
spectrum[ i-1 ] = new Color( i/(float)N, i/(float)N, i/(float)N );
// As i goes from 1 to N, this color goes from almost pure green to pure red.
spectrum2[ i-1 ] = new Color( i/(float)N, (N-i)/(float)N, 0 );
public void paint( Graphics g ) {
int step = 90 / N;
for ( int i = 0; i < N; ++i ) {
g.setColor( spectrum[ i ] );
g.fillArc( 0, 0, 2*width, 2*height, 90+i*step, step+1 );
g.setColor( spectrum2[ i ] );
g.fillArc( width/3, height/3, 4*width/3, 4*height/3, 90+i*step, step+1 );
Then it is requires to enable java to see this applet.
i went to intenet explorer->tools->internet options->advanced->enabled jre(sun)and ok
Please help me how to proceed further to view the final outputIf you're using Microsoft's JVM, I think you have to restart the browser after turning the JVM on.
But it's an old, crappy JVM anyway.
Install the Java plug-in from Sun. -
in the previous version of Number, the menu table in table options, there is an option that gives me the option: the Return key moves to next cell. I do not see this option in the new number. can you help me please?
Hi silvano,
If you use a regular pattern when entering values, press enter (return) after entering the last value in a row. That will take you to the first Body Cell of the next row.
Start in Cell B2
1 Tab 2 Tab 3 Enter
4 Tab 5 Tab 6 Enter
7 Tab 8 Tab 9 Enter
Now you are ready to type into B5 .
Another way that some people find easier is to enter one column at a time
Start at B2
1 enter
4 enter
7 enter
etc.
Now start with C2.
Use whatever suits your work flow.
Regards,
Ian. -
how do you shuffle the image order when creating a new slideshow in apterture 3? i would like to do this automatically when creating a new slideshow. i see how you do it with presets when you just play a slideshow, but i don't see an option to randomly shuffle the slide order when you create a new slideshow. i know you can sort it by different fields, but i want it to be random. thanks.
If you want to rearrange images in random order you can try an AppleScript:
retrieve a list of selected images from Aperture
shuffe the list properly
create an album in Aperture and add the images from the list to the album (make sure that the album set to be orederd manually)
Here is a sample script that shuffles the selected images and displays them in random order in Full Screen Mode:
on removeItem(ims, i)
-- remove the item at position "i" from a list ims
if ims is {} then return {}
if (length of ims is 1) then return {}
if i < 2 then return rest of ims
if (i = length of ims) then return (items 1 thru (i - 1) of ims)
if i > (length of ims) then return ims -- should be error?
return (items 1 thru (i - 1) of ims) & (items (i + 1) thru (length of ims) of ims)
end removeItem
on shuffle_items(ims)
-- shuffle the items of the list "ims" randomly
local numitems, ims_shuffled, nextrest, nextpick, i
set numitems to length of ims
if length of ims < 2 then return ims
set ims_shuffled to {}
set nextrest to ims
repeat until nextrest is {}
set i to (random number (numitems - 1)) + 1
set nextpick to item i of nextrest
set beginning of ims_shuffled to nextpick
set numitems to numitems - 1
set nextrest to removeItem(nextrest, i)
end repeat
return ims_shuffled
end shuffle_items
on shuffleIms()
-- retrieve the selected images from Aperture
-- and display them in random order in full screen mode
local imageSel, shuffled, i
tell application "Aperture"
activate
set imageSel to (get selection)
set shuffled to my shuffle_items(imageSel)
set fullscreen to true
if imageSel is {} then error "Please select some images."
repeat with i from 1 to count of shuffled
reveal {item i of shuffled}
delay 3 -- chnage that to the time you want
end repeat
set fullscreen to false
return shuffled
end tell
end shuffleIms
shuffleIms()
Some more code snippets to go from here:
To create an album:
tell library 1
if not (exists album "shuffledAlbum") then
make new album with properties {name:"shuffledAlbum", image version:shuffled}
end if
end tell
And to add the images from the shuffled list to the album:
repeat with i from 1 to count of shuffled
duplicate item i of shuffled to album "shuffledAlbum"
end repeat
Regards
Léonie -
Tab Limit Reached, Can't Open A New Tab Until You Close One.
How do I close the tabs?Asus doesn't make the iPad. Is this some other tablet?
Sounds like you have maxed out the browser windows. In the browser app, press the menu or overflow bottom to see if there is an window/tabs options. There you should see a thumbnail image of each tab you have opened and in the corner of each should be a X or minus symbol that you touch to close that tab/window. -
Hello. I have premiere elements 12, and have tried to open a new project, but nothing happened. All you see is a purple and black ribbon, then nothing. I can open the organizer without any problem at all!
What I have done so far:
Accepted all windows 7 updates - essential and non esential
I've updated my graphics drivers
I've also deleted and reloaded Premiere Elements from the disc
I reloaded quick time and accepted the latest version
All have no affect.
My system is a windows 7 64 bit PC.
I also have plenty of hard drive space
Cyberlink PowerDirector 11 works fine.
PS - This seems a common complaint about Premiere Elements 12
Help!David Scholes212
Premiere Elements 12 on Windows 7 64 bit
Look at the issue with and without the antivirus disabled. If that does not help....
There is a likelihood that the program may not be properly activated. Please review the following for possible solution
http://www.atr935.blogspot.com/2014/04/pe12-premiere-elements-12-editor-will.html
ATR Premiere Elements Troubleshooting: PE12: Sign In Failure (Connect to Internet or Fix Computer Clock)
Other possibilities include
a. Deleting the Settings file named Adobe Premiere Elements Prefs file
Local Disc C
Users
Owner
AppData
Roaming
Adobe
Premiere Elements
12.0
and in the 12.0 Folder is the Adobe Premiere Elements Prefs file that you delete. If that does not work, then delete the whole 12.0 Folder in which the Adobe Premiere Elements Prefs file exists. Be sure to be working with Folder Options Show Hidden Files, Folders, and Drives active so that you can see the whole path cited.
b. Do the uninstall, reinstall with a ccleaner (regular cleaner and registry cleaner parts) in between the uninstall and reinstall with the antivirus and firewalls turned Off.
Please review and consider. We will be watching for your progress.
Thank you.
ATR -
Dear Forummembers,
I am student doing postgraduate studies in IT.i have some queries related to one of my programming staff.i am very much new into Java programming and i am finding it a bit difficult to handle this program.The synopsis of the program is given below -
You are required to design and code an object-oriented java program to process bookings for a theatre perfomance.
Your program will read from a data file containing specifications of the performance,including the names of the theatre, the play and its author and the layout of the theatre consisting of the number of seats in each row.
It will then run a menu driven operation to accept theatre bookings or display the current
status of seating in the theatre.
The name of the file containing the details of the performance and the theatre should be
provided at the command line, eg by running the program with the command:
java Booking Theatre.txt
where Theare.txt represents an example of the data file.
A possible data file is:
Opera
U and Me
Jennifer Aniston
5 10 10 11 12 13 14
The data provided is as follows
Line 1
Name of the Theatre
Line 2
Name of the play being performed
Line 3
Name of the author of the play being performed
Line 4
A list of the lengths (number of seats) of each row in the theatre, from front to
back.
The program must start by reading this file, storing all the appropriate parameters and
establishing an object to accept bookings for this performance with all details for the theatre
and performance.
The program should then start a loop in which a menu is presented to the user, eg:
Select from the following:
B - Book seats
T - Display Theatre bookings
Q - Quit from the program
Enter your choice:
And keep performing selected operations until the user�s selects the quit option, when the
program should terminate.
T - Display Theatre bookings
The Display Theatre Bookings option should display a plan of the theatre. Every available
seat should be displayed containing its identification, while reserved seats should contain an
Rows in each theatre are indicated by letters starting from �A� at the front. Seats are
numbered from left to right starting from 1. A typical seat in the theatre might be designated
D12, representing seat 12 in row D.
B - Book seats
The booking of seats is to offer a number of different options.
First the customer must be asked how many adjacent seats are
required. Then start a loop offering a further menu of choices:
Enter one of the following:
The first seat of a selected series, eg D12
A preferred row letter, eg F
A ? to have the first available sequence selected for you
A # to see a display of all available seats
A 0 to cancel your attempt to book seats
Enter your selection:
1. If the user enters a seat indentifier such B6, The program should attempt to
reserve the required seats starting from that seat. For example if 4 seats are
required from B6, seats B6, B7, B8 and B9 should be reserved for the customer,
with a message confirming the reservation and specifying the seats reserved..
Before this booking can take place, some testing is required. Firstly, the row
letter must be a valid row. Then the seat number must be within the seats in the
row and such that the 4 seats would not go beyond the end of the row. The
program must then check that none of the required seats is already reserved.
If the seats are invalid or already reserved, no reservation should be made and the
booking menu should be repeated to give the customer a further chance to book
seats.
If the reservation is successful, return to the main menu.
2. The user can also simply enter a row letter, eg B.IN this case, the program should
first check that the letter is a valid row and then offer the user in turn each
adjacent block of the required size in the specified row and for each ask whether
the customer wants to take them. Using the partly booked theatre layout above, if
the customer wanted 2 seats from row B, the customer should be offered first:
Seats B5 to B6
then if the customer does not want them:
Seats B10 to B11
and finally
Seats B11 to B12
If the customer selects a block of seats, then return to the main menu. If none are
selected, or there is no block of the required size available in the row, then report
that no further blocks of the required size are available in the row and repeat the
booking menu.
3. If the user enters a ? the program should offer the customer every block of seats
of the required size in the whole theatre. This process should start from the first
row and proceed back a row at a time. For example, again using the partially
booked theatre shown above, if the user requested 9 seats, the program should
offer in turn:
Seats A1 to A9
Seats C1 to C9
Seats C2 to C10
Seats E3 to E11
Seats E4 to E12
If the customer selects a block of seats, then return to the main menu. If none are
selected, or there is no block of the required size available in the whole theatre,
then report that no further blocks of the required size are available and repeat the
booking menu.
4. If the user enters a # the program should display the current status of the seating
in the theatre, exactly the same as for the T option from the main menu and then
repeat the booking menu.
5. If the user enters a 0 (zero), the program should exit from the booking menu back
to the main menu. If for example the user wanted 9 seats and no block of 9 was
left in the theatre, he would need to make two separate smaller bookings.
The program should perform limited data validation in the booking process. If a single
character other than 0, ? and # is entered, it should be treated as a row letter and then tested
for falling within the range of valid rows, eg A to H in the example above. Any invalid row
letters should be rejected.
If more than one character is entered, the first character should be tested as a valid row letter,
and the numeric part should be tested for falling within the given row. You are NOT
required to test for valid numeric input as this would require the use of Exception handling.
You are provided with a class file:
Pad.java
containing methods that can be used for neat alignment of the seat identifiers in the theatre
plan.
File Processing
The file to be read must be opened within the program and if the named file does not exist, a
FileNotFoundException will be generated. It is desirable that this Exception be caught and
a corrected file name should be asked for.
This is not required for this assignment, as Exception handling has not been covered in this
Unit. It will be acceptable if the method simply throws IOException in its heading.
The only checking that is required is to make sure that the user does supply a file on the
command line, containing details of the performance. This can be tested for by checking the
length of the parameter array args. The array length should be 1. If not, display an error
message telling the user the correct way to run the program and then terminate the program
System.exit(0);
The file should be closed after reading is completed.
Program Requirements
You are expected to create at least three classes in developing a solution to this problem.
There should be an outer driving class, a class to represent the theatre performance and its
bookings and a class to represent a single row within the theatre.
You will also need to use arrays at two levels. You will need an array of Rows in the Theatre
class.
Each Row object will need an array of seats to keep track of which seats have been reserved.
Your outer driving class should be called BookingOffice and should be submitted in a file named BookingOffice.java
Your second, third and any additional classes, should be submitted in separate files, each
class in a .java file named with the same name as the class
I am also very sorry to give such a long description.but i mainly want to know how to approach for this program.
also how to designate each row about it's column while it is being read from the text file, how to store it, how to denote first row as row A(second row as row B and so on) and WHICH CLASS WILL PERFORM WHICH OPERATIONS.
pls do give a rough guideline about designing each class and it's reponsibilty.
thanking u and looking forward for your help,
sincerely
RKyes i do know that........but can u ppl pls mention
atleast what classes shud i consider and what will be
the functions of each class?No, sorry. Maybe somebody else will, but in general, this is not a good question for this forum. It's too broad, and the question you're asking is an overall problem solving approach that you should be familiar with at this point.
These forums are best suited to more specific questions. "How do I approach this homework?" is not something that most people are willing or able to answer in a forum like this. -
Problems with SwingWorker and classes in my new job, ;), can you help me?
Hi all, ;)
First of all, sorry about my poor English.
I have a problem with Swing and Threads, I hope you help me (because I'm in the firsts two weeks in my new job)
I have two classes:
Form1: Its a JPanel class with JProgressBar and JLabel inside.
FormularioApplet: (the main) Its a JPanel class with a form1 inside.
I have to download a file from a server and show the progress of the download in the JProgressBar. To make it I do this:
In Form1 I make a Thread that update the progress bar and gets the fole from the server.
In FormularioApplet (the main) I call to the method getDownloadedFile from Form1 to get the File.
THE PROBLEM:
The execution of FormularioApplet finishes before the Thread of Form1 (with download the file) download the file. Then, when I call in FormularioApplet the variable with the file an Exception: Exception in thread "AWT-EventQueue-1" java.lang.NullPointerException is generated.
First main begins his execution, then call to Form1 (a thread) then continues his execution and when the execution is finished ends the execution os Form1 and his thread.
How can I do for main class call the function and the Thread download his file after main class assign the file of return method?
How can I pass information froma class include an a main class. Form1 can't send to main (because main class made a Form1 f1 = new Form1()) any information from his end of the execution. I think if Form1 can say to main class that he finishes is job, then main class can gets the file.
I put in bold the important lines.
Note: My level of JAVA, you can see, is not elevated.
THANKS A LOT
Form1 class:
package es.cambrabcn.signer.gui;
import java.awt.HeadlessException;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.StringTokenizer;
import java.util.Vector;
import javax.swing.SwingUtilities;
public class Form1 extends javax.swing.JPanel {
//Variables relacionadas con la clase original DownloadProgressBar
private InputStream file;
private int totalCicles;
private int totalFiles;
private int currentProgress;
private SwingWorker worker;
private ByteArrayOutputStream byteArray;
private boolean done;
/** Creates new form prueba */
public Form1() {
initComponents();
this.byteArray = new ByteArrayOutputStream();
progressBar.setStringPainted(true);
//this.totalFiles = totalFiles;
currentProgress = 0;
/** This method is called from within the constructor to
* initialize the form.
* WARNING: Do NOT modify this code. The content of this method is
* always regenerated by the Form Editor.
// <editor-fold defaultstate="collapsed" desc=" C�digo Generado ">
private void initComponents() {
label1 = new javax.swing.JLabel();
progressBar = new javax.swing.JProgressBar();
statusLabel = new javax.swing.JLabel();
setBackground(new java.awt.Color(255, 255, 255));
setMaximumSize(new java.awt.Dimension(300, 150));
setMinimumSize(new java.awt.Dimension(300, 150));
setPreferredSize(new java.awt.Dimension(300, 150));
label1.setFont(new java.awt.Font("Arial", 1, 18));
label1.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
label1.setText("Barra de progreso");
statusLabel.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
statusLabel.setText("Cargando");
org.jdesktop.layout.GroupLayout layout = new org.jdesktop.layout.GroupLayout(this);
this.setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
.add(org.jdesktop.layout.GroupLayout.TRAILING, layout.createSequentialGroup()
.addContainerGap()
.add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.TRAILING)
.add(org.jdesktop.layout.GroupLayout.LEADING, statusLabel, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, 280, Short.MAX_VALUE)
.add(org.jdesktop.layout.GroupLayout.LEADING, progressBar, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, 280, Short.MAX_VALUE)
.add(org.jdesktop.layout.GroupLayout.LEADING, label1, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, 280, Short.MAX_VALUE))
.addContainerGap())
layout.setVerticalGroup(
layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
.add(layout.createSequentialGroup()
.addContainerGap()
.add(label1)
.addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED)
.add(progressBar, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED)
.add(statusLabel)
.addContainerGap(73, Short.MAX_VALUE))
}// </editor-fold>
// Declaraci�n de variables - no modificar
private javax.swing.JLabel label1;
private javax.swing.JProgressBar progressBar;
private javax.swing.JLabel statusLabel;
// Fin de declaraci�n de variables
public byte[] getDownloadedFile(String documentToSign){
//Variables locales
byte puente[] = null;
try{
//Leemos el documento a firmar
StringTokenizer st = new StringTokenizer(documentToSign, ";");
Vector<URL> fileURL = new Vector<URL>();
HttpSender sender = new HttpSender(null);
//Introducimos la lista de URLs de archivos a bajar en el objeto Vector
for(; st.hasMoreTokens(); fileURL.add(new URL(st.nextToken())));
//Para cada URL descargaremos un archivo
for(int i = 0; i < fileURL.size(); i++) {
file = sender.getMethod((URL)fileURL.get(i));
if(file == null) {
Thread.sleep(1000L);
throw new RuntimeException("Error descarregant el document a signar.");
System.out.println("Form1 Dentro de getDownloadFile, Antes de startDownload()");
//Fijamos el valor del n�mero de ciclos que se har�n seg�n el tama�o del fichero
this.totalCicles = sender.returnCurrentContentLength() / 1024;
this.progressBar.setMaximum(totalCicles);
//Modificamos el texto del JLabel seg�n el n�mero de fichero que estemos descargando
this.statusLabel.setText((new StringBuilder("Descarregant document ")).append(i + 1).append(" de ").append(fileURL.size()).toString());
statusLabel.setAlignmentX(0.5F);
*//Iniciamos la descarga del fichero, este m�todo llama internamente a un Thread*
*this.startDownload();*
*System.out.println("Form1 Dentro de getDownloadFile, Despu�s de startDownload()");*
*//if (pane.showProgressDialog() == -1) {*
*while (!this.isDone()){*
*System.out.println("No est� acabada la descarga");*
*if (this.isDone()){*
*System.out.println("Thread ACABADO --> Enviamos a puente el archivo");*
*puente = this.byteArray.toByteArray();*
*System.out.println("Form1 getDownloadFile() tama�o puente: " + puente.length);*
*else{*
*Thread.sleep(5000L);*
*// throw new RuntimeException("Proc�s de desc�rrega del document a signar cancel�lat.");*
catch (HeadlessException e) {
//javascript("onSignError", new String[] {
//(new StringBuilder("UI: ")).append(e.getMessage()).toString()});
e.printStackTrace();
catch (MalformedURLException e) {
//javascript("onSignError", new String[] {
//(new StringBuilder("CMS: ")).append(e.getMessage()).toString()});
e.printStackTrace();
catch (HttpSenderException e) {
//javascript("onSignError", new String[] {
//(new StringBuilder("CMS: ")).append(e.getMessage()).toString()});
e.printStackTrace();
catch (InterruptedException e) {
//javascript("onSignError", new String[] {
//(new StringBuilder("CMS: ")).append(e.getMessage()).toString()});
e.printStackTrace();
//System.out.println("Form1 getDownloadFile() tama�o puente: " + puente.length);
return puente;
public void updateStatus(final int i){
Runnable doSetProgressBarValue = new Runnable() {
public void run() {
progressBar.setValue(i);
SwingUtilities.invokeLater(doSetProgressBarValue);
public void startDownload() {
System.out.println("Form1 Inicio startDownload()");
System.out.println("Form1 Dentro de startDownload, antes de definir la subclase SwingWorker");
System.out.println(done);
worker = new SwingWorker() {
public Object construct() {
System.out.println("Form1 Dentro de startDownload, dentro de construct(), Antes de entrar en doWork()");
return doWork();
public void finished() {
System.out.println("Form1 Dentro de startDownload, dentro de finished(), Antes de asignar done = true");
System.out.println(done);
done = true;
System.out.println("Form1 Dentro de startDownload, dentro de finished(), Despu�s de asignar done = true");
System.out.println(done);
statusLabel.setText("Completado, tama�o del archivo: " + (byteArray.size() / 1024) + "KB");
System.out.println("Form1 Dentro de startDownload, antes de worker.start()");
worker.start();
System.out.println("Form1 Dentro de startDownload, antes de salir de startDownload");
System.out.println(done);
System.out.println("Form1 Dentro de startDownload, despu�s de worker.start()");
* M�todo doWork()
* Este m�todo descarga por partes el archivo que es necesario descargar, adem�s de actualizar
* la barra de carga del proceso de carga de la GUI.
public Object doWork() {
System.out.println("Form1 doWork() this.byteArray.size(): " + this.byteArray.size());
try {
byte buffer[] = new byte[1024];
for(int c = 0; (c = this.file.read(buffer)) > 0;) {
this.currentProgress++;
updateStatus(this.currentProgress);
this.byteArray.write(buffer, 0, c);
this.byteArray.flush();
this.file.close();
this.currentProgress = totalCicles;
updateStatus(this.currentProgress);
} catch(IOException e) {
e.printStackTrace();
System.out.println("Form1 doWork() FINAL this.byteArray.size(): " + this.byteArray.size());
//done = true;
System.out.println("AHORA DONE = TRUE");
return "Done";
public boolean isDone() {
return this.done;
FormularioApplet class (main)
package es.cambrabcn.signer.gui;
import java.awt.Color;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.net.URL;
import java.security.Security;
import java.util.StringTokenizer;
import java.util.Vector;
import javax.swing.SwingUtilities;
import netscape.javascript.JSObject;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import sun.security.provider.Sun;
import be.cardon.cryptoapi.provider.CryptoAPIProvider;
public class FormularioApplet extends java.applet.Applet {
//Variables globales
int paso = 0;
private static final String JS_ONLOAD = "onLoad";
private static final String JS_ONLOADERROR = "onLoadError";
private static final int SIGNATURE_PDF = 1;
private static final int SIGNATURE_XML = 2;
//private String signButtonValue;
private int signatureType;
private String documentToSign;
private String pdfSignatureField;
private Vector<String> outputFilename;
private Color appletBackground = new Color(255, 255, 255);
private Vector<byte[]> ftbsigned;
* Initializes the applet FormularioApplet
public void init(){
try {
SwingUtilities.invokeLater(new Runnable() {
//SwingUtilities.invokeAndWait(new Runnable() {
//java.awt.EventQueue.invokeAndWait(new Runnable() {
public void run() {
try{
readParameters();
initComponents();
catch(FileNotFoundException e){
javascript(JS_ONLOADERROR, new String[] {
(new StringBuilder("Init: ")).append(e.getMessage()).toString()});
e.printStackTrace();
catch(IOException e) {
javascript(JS_ONLOADERROR, new String[] {
(new StringBuilder("Init: ")).append(e.getMessage()).toString()});
e.printStackTrace();
catch (Exception e) {
javascript(JS_ONLOADERROR, new String[] {
(new StringBuilder("Init: ")).append(e.getMessage()).toString()});
e.printStackTrace();
javascript(JS_ONLOAD, null);
/** This method is called from within the init() method to
* initialize the form.
* WARNING: Do NOT modify this code. The content of this method is
* always regenerated by the Form Editor.
// <editor-fold defaultstate="collapsed" desc=" C�digo Generado ">
private void initComponents() {
this.setSize(350, 450);
appletPanel = new javax.swing.JPanel();
jPanel1 = new javax.swing.JPanel();
jTextField1 = new javax.swing.JLabel();
jPanel2 = new javax.swing.JPanel();
label = new javax.swing.JLabel();
jPanel3 = new javax.swing.JPanel();
jButton1 = new javax.swing.JButton();
jButton2 = new javax.swing.JButton();
setLayout(new java.awt.BorderLayout());
appletPanel.setBackground(new java.awt.Color(255, 255, 255));
appletPanel.setMaximumSize(new java.awt.Dimension(350, 430));
appletPanel.setMinimumSize(new java.awt.Dimension(350, 430));
appletPanel.setPreferredSize(new java.awt.Dimension(350, 430));
jPanel1.setBackground(new java.awt.Color(255, 255, 255));
jPanel1.setBorder(javax.swing.BorderFactory.createLineBorder(new java.awt.Color(0, 102, 204)));
jTextField1.setFont(new java.awt.Font("Arial", 1, 18));
jTextField1.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
jTextField1.setText("SIGNATURA ELECTRONICA");
org.jdesktop.layout.GroupLayout jPanel1Layout = new org.jdesktop.layout.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
.add(jPanel1Layout.createSequentialGroup()
.addContainerGap()
.add(jTextField1, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, 308, Short.MAX_VALUE)
.addContainerGap())
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
.add(jPanel1Layout.createSequentialGroup()
.addContainerGap()
.add(jTextField1, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, 24, Short.MAX_VALUE)
.addContainerGap())
jPanel2.setBackground(new java.awt.Color(255, 255, 255));
jPanel2.setBorder(javax.swing.BorderFactory.createLineBorder(new java.awt.Color(0, 102, 204)));
label.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
label.setIcon(new javax.swing.ImageIcon("C:\\java\\workspaces\\cambrabcn\\firmasElectronicas\\logo.gif"));
org.jdesktop.layout.GroupLayout jPanel2Layout = new org.jdesktop.layout.GroupLayout(jPanel2);
jPanel2.setLayout(jPanel2Layout);
jPanel2Layout.setHorizontalGroup(
jPanel2Layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
.add(jPanel2Layout.createSequentialGroup()
.addContainerGap()
.add(label, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, 308, Short.MAX_VALUE)
.addContainerGap())
jPanel2Layout.setVerticalGroup(
jPanel2Layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
.add(jPanel2Layout.createSequentialGroup()
.addContainerGap()
.add(label)
.addContainerGap(229, Short.MAX_VALUE))
jPanel3.setBackground(new java.awt.Color(255, 255, 255));
jPanel3.setBorder(javax.swing.BorderFactory.createLineBorder(new java.awt.Color(0, 102, 204)));
//this.jButton1.setVisible(false);
//this.jButton2.setVisible(false);
jButton1.setText("Seg\u00fcent");
jButton1.setAlignmentX(0.5F);
//Cargamos el primer formulario en el JPanel2
loadFirstForm();
//Modificamos el texto del bot�n y el contador de pasos.
//this.jButton1.setText("Siguiente");
//this.jButton1.setVisible(true);
//this.jButton2.setVisible(true);
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
jButton2.setText("Cancel\u00b7lar");
jButton2.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton2ActionPerformed(evt);
org.jdesktop.layout.GroupLayout jPanel3Layout = new org.jdesktop.layout.GroupLayout(jPanel3);
jPanel3.setLayout(jPanel3Layout);
jPanel3Layout.setHorizontalGroup(
jPanel3Layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
.add(org.jdesktop.layout.GroupLayout.TRAILING, jPanel3Layout.createSequentialGroup()
.addContainerGap()
.add(jButton1, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 94, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED, 112, Short.MAX_VALUE)
.add(jButton2, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 102, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
.addContainerGap())
jPanel3Layout.setVerticalGroup(
jPanel3Layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
.add(org.jdesktop.layout.GroupLayout.TRAILING, jPanel3Layout.createSequentialGroup()
.addContainerGap()
.add(jPanel3Layout.createParallelGroup(org.jdesktop.layout.GroupLayout.BASELINE)
.add(jButton2)
.add(jButton1))
.addContainerGap())
org.jdesktop.layout.GroupLayout appletPanelLayout = new org.jdesktop.layout.GroupLayout(appletPanel);
appletPanel.setLayout(appletPanelLayout);
appletPanelLayout.setHorizontalGroup(
appletPanelLayout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
.add(org.jdesktop.layout.GroupLayout.TRAILING, appletPanelLayout.createSequentialGroup()
.addContainerGap()
.add(appletPanelLayout.createParallelGroup(org.jdesktop.layout.GroupLayout.TRAILING)
.add(org.jdesktop.layout.GroupLayout.LEADING, jPanel2, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.add(org.jdesktop.layout.GroupLayout.LEADING, jPanel1, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.add(org.jdesktop.layout.GroupLayout.LEADING, jPanel3, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
.addContainerGap())
appletPanelLayout.setVerticalGroup(
appletPanelLayout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
.add(org.jdesktop.layout.GroupLayout.TRAILING, appletPanelLayout.createSequentialGroup()
.addContainerGap()
.add(jPanel1, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED)
.add(jPanel2, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED)
.add(jPanel3, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
.addContainerGap())
add(appletPanel, java.awt.BorderLayout.CENTER);
}// </editor-fold>
private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
this.destroy();
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
changeForms(this.paso);
// Declaraci�n de variables - no modificar
private javax.swing.JPanel appletPanel;
private javax.swing.JButton jButton1;
private javax.swing.JButton jButton2;
private javax.swing.JPanel jPanel1;
private javax.swing.JPanel jPanel2;
private javax.swing.JPanel jPanel3;
private javax.swing.JLabel jTextField1;
private javax.swing.JLabel label;
// Fin de declaraci�n de variables
* M�todo readParameters
* M�todo que inicializa los valores de los par�metros internos, recibidos por par�metro.
private void readParameters() throws FileNotFoundException, IOException {
???????????????? deleted for the forum
addSecurityProviders();
* M�tode loadFirstForm
* Aquest m�tode carrega a jPanel2 el formulari que informa sobre la c�rrega dels arxius
private void loadFirstForm(){
//Form1 f1 = new Form1(stream, i + 1, fileURL.size(), sender.returnCurrentContentLength(), appletBackground);
//Form1 f1 = new Form1(fileURL.size(), sender.returnCurrentContentLength());
Form1 f1 = new Form1();
//Lo dimensionamos y posicionamos
f1.setSize(310, 150);
f1.setLocation(10, 110);
//A�adimos el formulario al JPanel que lo contendr�
this.jPanel2.add(f1);
//Validem i repintem el JPanel
jPanel2.validate();
jPanel2.repaint();
//Descarreguem l'arxiu a signar
*System.out.println("FormularioApplet Dentro de loadFirstForm(), antes de llamar a getDownloadFile()");*
*byte obj[] = f1.getDownloadedFile(this.documentToSign);*
if (obj == null){
System.out.println("Lo que devuelve f1.getDownloadedFile(this.documentToSign) es NULL");
else{
System.out.println("Lo que devuelve f1.getDownloadedFile(this.documentToSign) NO es NULL");
System.out.println("obj: " + obj.length);
this.ftbsigned.add(obj);
System.out.println("FormularioApplet Dentro de loadFirstForm(), despu�s de llamar a getDownloadFile()");
//Indicamos que el primer paso ya se ha efectuado
this.paso++;
* M�tode changeForms
* Aquest m�tode carrega a jPanel2 un formulari concret segons el valor de la variable global "paso"
private void changeForms(int paso){
/*A cada paso se cargar� en el JPanel y formulario diferente
* Paso previo: Se realiza en la inicializaci�n, carga el formulario, descarga el archivo y muestra la barra de carga.
* Case 1: Se carga el formulario de selecci�n de tipo de firma.
* Case 2: Se carga el formulario de datos de la persona que firma.
this.paso = paso;
switch(paso){
case 1:
//Creamos un objeto de formulario (seleccion de tipo de firma)
Form2 f2 = new Form2();
//Lo dimensionamos y posicionamos
f2.setSize(310, 185);
f2.setLocation(10, 110);
//Quitamos el formulario 1 y a�adimos el formulario 2 al JPanel
this.jPanel2.remove(1);
this.jPanel2.add(f2);
//Validem i repintem el JPanel
jPanel2.validate();
jPanel2.repaint();
//Modificamos el contador de pasos.
this.paso++;
break;
case 2:
//Creamos un objeto de formulario (seleccion de tipo de firma)
Form3 f3 = new Form3();
//Lo dimensionamos y posicionamos
f3.setSize(310, 175);
f3.setLocation(15, 130);
//Quitamos el formulario 1 y a�adimos el formulario 3 al JPanel
this.jPanel2.remove(1);
this.jPanel2.add(f3);
//Validem i repintem el JPanel
jPanel2.validate();
jPanel2.repaint();
//Modificamos el texto del bot�n y el contador de pasos.
this.jButton1.setText("Finalizar");
this.paso++;
break;
default:
//Finalizar el Applet
//C�digo que se encargue de guardar el archivo en el disco duro del usuario
break;
private void addSecurityProviders() throws FileNotFoundException, IOException {
Security.addProvider(new CryptoAPIProvider());
if (signatureType == SIGNATURE_PDF) {
Security.addProvider(new BouncyCastleProvider());
else {
Security.addProvider(new Sun());
private File createOutputFile(String filename, int index) {
return new File((String)outputFilename.get(index));
protected Object javascript(String function, String args[]) throws RuntimeException {
//Remove
if (true) return null;
try {
Vector<String> list = new Vector<String>();
if(args != null) {
for(int i = 0; i < args.length; i++) {
list.addElement(args);
if(list.size() > 0) {
Object objs[] = new Object[list.size()];
list.copyInto(objs);
return JSObject.getWindow(this).call(function, objs);
} catch(UnsatisfiedLinkError e) {
e.printStackTrace();
throw new RuntimeException((new StringBuilder()).append(e).append("\nFunci�: ").append(function).toString());
} catch(Throwable e) {
e.printStackTrace();
throw new RuntimeException((new StringBuilder()).append(e).append("\nFunci�: ").append(function).toString());
return JSObject.getWindow(this).call(function, new Object[0]);
Edited by: Kefalegereta on Oct 31, 2007 3:54 AM
Edited by: Kefalegereta on Oct 31, 2007 4:00 AMLook at iOS Troubleshooting Wi-Fi networks and connections http://support.apple.com/kb/TS1398
iPad: Issues connecting to Wi-Fi networks http://support.apple.com/kb/ts3304
iOS: Recommended settings for Wi-Fi routers and access points http://support.apple.com/kb/HT4199
Additional things to try.
Try this first. Turn Off your iPad. Then turn Off (disconnect power cord) the wireless router & then back On. Now boot your iPad. Hopefully it will see the WiFi.
Go to Settings>Wi-Fi and turn Off. Then while at Settings>Wi-Fi, turn back On and chose a Network.
Change the channel on your wireless router. Instructions at http://macintoshhowto.com/advanced/how-to-get-a-good-range-on-your-wireless-netw ork.html
Another thing to try - Go into your router security settings and change from WEP to WPA with AES.
How to Quickly Fix iPad 3 Wi-Fi Reception Problems
http://osxdaily.com/2012/03/21/fix-new-ipad-3-wi-fi-reception-problems/
If none of the above suggestions work, look at this link.
iPad Wi-Fi Problems: Comprehensive List of Fixes
http://appletoolbox.com/2010/04/ipad-wi-fi-problems-comprehensive-list-of-fixes/
Fix iPad Wifi Connection and Signal Issues http://www.youtube.com/watch?v=uwWtIG5jUxE
~~~~~~~~~~~~~~~
If any of the above solutions work, please post back what solved your problem. It will help others with the same problem.
Cheers, Tom -
Issue with new EWS Java 1.2 license and ambiguity
If this isn't the proper place for this thread, then please let me know where it should go.
I noticed that EWS Java 1.2 has been marked with an Apache 2.0 license. Let me just say this...
FINALLY!
If ever there was a project that needed it, it's EWS Java. That API has seemingly turned into abandonware and the old license forbade redistribution of modified source, so the many bugs in it had to be independently fixed by devs around the world. Not fun.
With a proper open source license, this problem can be alleviated.
HOWEVER...
After downloading the zip file from the new EWS Java page, I've found that while the Apache 2.0 license is present in the root directory, the earlier and more restrictive license is still present in the project directory. This introduces ambiguity into the
license terms. Not good. I would not be comfortable redistributing modified (or even original) source code with this kind of ambiguity, even if it's just an oversight on Microsoft's part. Please remove the old license entirely from the API.
Also, if possible, can this get an official repository? The new license is great, but with only a zip file as an "official" source, it's begging for fragmentation across who-knows-how-many repositories and accounts, especially since it's not even
a proper Maven project.
I'd love to do some work on EWS Java myself (I've already fixed a number of bugs), but with the license issues and lack of an official repository, that doesn't seem terribly feasible.I'm not sure if you're going to be able to reliably find an actual fulltime MSFT person (especially targeted towards a specific product group) in any of these forums. You might try posting a comment on this blog post though, that might help get someone's
attention:
http://blogs.msdn.com/b/exchangedev/archive/2013/01/03/ews-java-api-1-2-get-started.aspx?Redirected=true#comments
We do have a Microsoft employee who moderates this forum, but since this forum is only meant for feedback on the defunct TechNet subscriptions I don't think he'll be able to help you out very much. We'll see though, maybe Mike has some Exchange team connections
that I don't know about.
Don't retire TechNet! -
(Don't give up yet - 12,950+ strong and growing) -
Hi, I'm very new to java - 2nd day. Trying to move from Visual FoxPro.
In testing statements to learn java, I can't seem to get java.util.Scanner.nextInt or nextDouble ... etc. to wait for a keyborad input. Is there something I have to configure before utilizing ...Scanner.nextWhatever?
I'm using the latest java (just downloaded 2 day ago) and TextPad as my editor.
Thanks you.Hi Petes1234:
Thanks for you quick response!!!!
The following is the code very simple ... still my "Hello World!" phase of learning.
import java.util.Scanner;
public class ScannerApp
static Scanner sc = new Scanner(System.in);
public static void main(String[] args)
System.out.print("Enter an integer: ");
int x = sc.nextInt();
System.out.println("You entered " + x + ".");
}The above code complies fine. But when I try to run it, it errors out with the following error:
Enter an integer: Exception in thread "main" java.util.NoSuchElementException
at java.util.Scanner.throwFor(Scanner.java:838)
at java.util.Scanner.next(Scanner.java:1461)
at java.util.Scanner.nextInt(Scanner.java:2091)
at java.util.Scanner.nextInt(Scanner.java:2050)
at ScannerApp.main(ScannerApp.java:11)
See anyting I'm doing wrong here? -
Compiling message "cannot read" (new to java)
Sorry about yet another question on compiling. I'm new to java. I've read alot of the threads on this, but my HelloJava.java won't compile.
I'm working on w2k. I've set my path to
%SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem;c:\j2sdk1.4.0\bin
using the environment variables in the system properties box.
This seems to work fine.
but I keep getting the "cannot read" when compiling.
I've created a classpath variable in the environment variables
CLASSPATH = .;C:\src
and my java file is definately .java not .java.txt and it's in the src folder on my c drive.
Do I need to set classpath? Also I've put my HelloJava.java file in the same folder as my javac and it still won't compile. What am I doing wrong?
By the way, the HelloJava file came from the book "Learning Java".
thanks in advance.OK -
If you place your .java files in C:\src, to compile you must either
1. Go to (change the current directory to, using cd command) c:\src and then enter "javac ...."
or
2 From any directory enter "javac C:\src\...."
Classpath is used by javac and java, but not in this way.
Read here for the full story:
The Path is a set of pointers that Windows uses to locate programs that you execute, like javac.exe and java.exe. This setting is explained here:
http://java.sun.com/j2se/1.4/install-windows.html
Scroll down to: 5. Update the PATH variable
The CLASSPATH is another set of pointers that is used by Java to find the files that you create and want compiled and/or run. This setting is explained here:
Setting the Classpath:
http://java.sun.com/j2se/1.4/docs/tooldocs/windows/classpath.html
[NOTE: always start your classpath with ".;" which means the current directory. See my classpath, below]
How Classes are Found:
http://java.sun.com/j2se/1.4/docs/tooldocs/findingclasses.html -
New to java - glitch in my program/game? should be a simple fix :)
hey everyone, I'm a student who's new to java programming :) It's is also the first programming language that I'm learning. I know the basics, but nothing very complicated.
I'm making a pong-like game, in an applet.
As I was making the paddle and using a mouselistener to make it move vertically, I came across this problem, the paddle will move vertically with the mouse's position, but one end of my paddle will grow abnormally (I want it to stay the same size as it moves up and down)
Here's my code: (I'm not using most of the mouselistener and keylistener classes yet, so you can ignore them. I'm guessing the problem is probably in one of the last classes, at the bottom)
ypaddle is the variable used for getting the co-ordinates of the mouse and transferring them to the paddle itself
// The "Ping" class.
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
*Ping
public class Ping extends Applet
implements KeyListener, MouseListener, MouseMotionListener
int width, height, x, ypaddle;
Graphics g;
char move;
*Initializes variables
public void init ()
resize (700, 500);
setBackground (Color.white);
addKeyListener (this);
addMouseListener (this);
addMouseMotionListener(this);
public void keyPressed (KeyEvent e)
public void keyReleased (KeyEvent e)
public void keyTyped (KeyEvent e)
public void mouseEntered (MouseEvent e)
public void mouseExited (MouseEvent e)
public void mousePressed (MouseEvent e)
public void mouseReleased (MouseEvent e)
public void mouseClicked (MouseEvent e)
public void mouseMoved (MouseEvent e)
ypaddle = e.getY ();
repaint();
public void mouseDragged (MouseEvent e)
public void paint (Graphics g)
paddle (g, ypaddle);
* Creates the paddle for hitting the ball
*@param y value used to move the paddle vertically
public void paddle (Graphics g, int y)
g.fillRect (10, 10+y, 15, 60+y);
} // Ping classI'm totally stumped, I've tried for 2 hours to find the problem, and I have a feeling it's something very simple that I'm passing over...
If you have any questions about the variables or other things, please ask!
And one last little quick question, is there a way I can restrict the movement of the paddle between two Y values? (i.e not higher than y=10 or lower than y=100)
Thanks in advance :)soundweave wrote:
I'm not exactly sure how to find out, Eh?
You wrote this code:
g.fillRect (10, 10+y, 15, 60+y);Do you understand what fillRect does? If I call fillRect(10, 20, 30, 40) where will that rectangle be drawn? If you don't know how to answer that, I don't see how you could have written that line of code.
but here's some pictures of what happens ( I put in 0 and 80 as the y values in each picture, and left the code window open so you can see )I don't need to see them.
Y at 0: [http://i731.photobucket.com/albums/ww314/len56/Untitled.jpg?t=1263077701|http://i731.photobucket.com/albums/ww314/len56/Untitled.jpg?t=1263077701]
Y at 80: [http://i731.photobucket.com/albums/ww314/len56/Untitled2.jpg?t=1263077625|http://i731.photobucket.com/albums/ww314/len56/Untitled2.jpg?t=1263077625]
So, given that the first one comes from fillRect(10, 10, 15, 60), (you get where that comes from I hope) and the second comes from fillRect(10, 90, 15, 150) (that too), does that not suggest that something is wrong with the numbers you're passing to fillRect? And since you have read the docs for fillRect and know what it does and what each of its parameters represents (right?), does it not suggest exactly what is wrong with those numbers? -
i'm trying to write a simple image viewer application.
Can you see the problem. i can't. i'll appreciate any advice or help?
import java.awt.*;
import java.awt.image.*;
import java.awt.event.*;
import java.io.*;
public class SimpleViewer extends Frame {
protected Image awtImage;
public void loadAndDisplay(String filename) {
Image img = readImage(filename);
awtImage = img;
int width = img.getWidth(this);
int height = img.getHeight(this);
displayImage(img, width, height);
public void displayImage(Image img, int width, int height) {
addWindowListener(
new WindowAdapter() {
public void windowClosing(WindowEvent e){
System.exit(0);
setTitle("Simple Viewer ");
pack();
setSize(new Dimension(width, height));
show();
repaint();
public image readImage(String filename) {
Image image = Toolkit.getDefaultToolkit().getImage(imageName);
MediaTracker imageTracker = new MediaTracker(this);
imageTracker.addImage(image, 0);
try{
imageTracker.waitForID(0);
}catch(InterruptedException e){ return null;}
return image;
public void paint(Graphics g){
Rectangle rect = this.getBounds();
if(awtImage != null) {
g.drawImage(awtImage, 0,0,rect.width, rect.height, this);
public static void main(String[] args){
SimpleViewer ip = new SimpleViewer();
if(args.length <1) {
System.out.println("Enter a valid image file name");
System.exit(0);
ip.loadAndDisplay(args[0]);
}check this line and tell me what you see... after all, it's the source of your compiler errors...
public image readImage(String filename) {
Image image = Toolkit.getDefaultToolkit().getImage(imageName);once you figure that out, it will work...
( hint : check variable names and capitalization of names )
- MaxxDmg...
- ' He who never sleeps... ' -
Help needed, new to java programming
hi,
I have craeted a Frame with some check boxes and button called "button1".
Can anyone tell me how can i count the number of CHECKED check boxes so that when i press the button1 in my code it should display the result as number of checked check boxes divided by total number of check boxes. It should display the result in a textfield here RESULT textfield in my code
Thanks in advance ...i am sending the code i have written so far....
public class Frame extends java.awt.Frame {
/** Creates new form Frame */
public Frame() {
initComponents();
setSize(600, 600);
/** This method is called from within the constructor to
* initialize the form.
* WARNING: Do NOT modify this code. The content of this method is
* always regenerated by the Form Editor.
private void initComponents() {
buttonGroup1 = new javax.swing.ButtonGroup();
checkbox1 = new java.awt.Checkbox();
checkbox2 = new java.awt.Checkbox();
checkbox3 = new java.awt.Checkbox();
button1 = new java.awt.Button();
textField1 = new java.awt.TextField();
setLayout(null);
addWindowListener(new java.awt.event.WindowAdapter() {
public void windowClosing(java.awt.event.WindowEvent evt) {
exitForm(evt);
checkbox1.setLabel("checkbox1");
add(checkbox1);
checkbox1.setBounds(160, 50, 84, 20);
checkbox2.setLabel("checkbox2");
add(checkbox2);
checkbox2.setBounds(160, 70, 84, 20);
checkbox3.setLabel("checkbox3");
add(checkbox3);
checkbox3.setBounds(160, 90, 84, 20);
button1.setLabel("button1");
button1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
button1ActionPerformed(evt);
add(button1);
button1.setBounds(150, 180, 57, 24);
textField1.setText("Result");
textField1.setName("Result");
add(textField1);
textField1.setBounds(260, 180, 44, 20);
pack();
private void button1ActionPerformed(java.awt.event.ActionEvent evt) {
// Add your handling code here:
/** Exit the Application */
private void exitForm(java.awt.event.WindowEvent evt) {
System.exit(0);
* @param args the command line arguments
public static void main(String args[]) {
new Frame().show();
// Variables declaration - do not modify
private java.awt.Button button1;
private javax.swing.ButtonGroup buttonGroup1;
private java.awt.Checkbox checkbox1;
private java.awt.Checkbox checkbox2;
private java.awt.Checkbox checkbox3;
private java.awt.TextField textField1;
// End of variables declaration
}Two problems in the code you repost-ed:
1. It lacks import statements.
2. There is an extraneous } at the end of the button1ActionPerformed method.
Correct them and it'll work fine. Posting the full source code:
import java.awt.Component;
import java.awt.Checkbox;
public class Frame extends java.awt.Frame
/** Creates new form Frame */
public Frame()
initComponents();
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
private void initComponents()
checkbox1 = new java.awt.Checkbox();
checkbox2 = new java.awt.Checkbox();
checkbox3 = new java.awt.Checkbox();
button1 = new java.awt.Button();
textField1 = new java.awt.TextField();
setLayout( null );
addWindowListener( new java.awt.event.WindowAdapter()
public void windowClosing( java.awt.event.WindowEvent evt )
exitForm( evt );
checkbox1.setLabel( "checkbox1" );
add( checkbox1 );
checkbox1.setBounds( 120, 40, 84, 20 );
checkbox2.setLabel( "checkbox2" );
add( checkbox2 );
checkbox2.setBounds( 120, 60, 84, 20 );
checkbox3.setLabel( "checkbox3" );
add( checkbox3 );
checkbox3.setBounds( 120, 80, 84, 20 );
button1.setLabel( "button1" );
button1.addActionListener( new java.awt.event.ActionListener()
public void actionPerformed( java.awt.event.ActionEvent evt )
button1ActionPerformed( evt );
add( button1 );
button1.setBounds( 50, 170, 57, 24 );
textField1.setText( "textField1" );
add( textField1 );
textField1.setBounds( 240, 170, 60, 20 );
pack();
private void button1ActionPerformed( java.awt.event.ActionEvent evt )
// Add your handling code here:
Component[] components = getComponents();
int numOfCheckBoxes = 0;
int numChecked = 0;
for ( int i = 0; i < components.length; i++ )
if ( components[i] instanceof Checkbox )
numOfCheckBoxes++;
Checkbox checkBox = (Checkbox) components;
if ( checkBox.getState() )
numChecked++;
double ratio = (double) numChecked / (double) numOfCheckBoxes;
textField1.setText( Double.toString( ratio ) );
/** Exit the Application */
private void exitForm( java.awt.event.WindowEvent evt )
System.exit( 0 );
* @param args the command line arguments
public static void main( String args[] )
new Frame().show();
// Variables declaration - do not modify
private java.awt.Button button1;
private java.awt.Checkbox checkbox1;
private java.awt.Checkbox checkbox2;
private java.awt.Checkbox checkbox3;
private java.awt.TextField textField1;
// End of variables declaration
I can see from the code that the GUI was generated by a tool. Since you're new to Java programming, I'd recommend ditching the tool and writing everything by hand, otherwise you're not learning much. It's just like when you're learning proofs in Maths, where you start with first principles before making use of the proofs on their own.
Also, it'll help tremendously if you could spend some time going through the Java Tutorial (http://java.sun.com/docs/books/tutorial/). It's free, and I find it very useful.
Hth.
Maybe you are looking for
-
Calling super.method() from anonymous class
Look at this: class SynchronizedListModel extends DefaultListModel public void addElement(Object obj) { final Object fObj = obj; Runnable rAdd = new Runnable() public void run() { super.addElement(fObj
-
Gl, vendor and customer balances in program
I need to upload GL, Vendor and customer balances in single program(bapi or normal recording also.). If any body is having code for this and any thread is available please help me .. urgent... Thanks inadvance praveen
-
Premature end of file failure in Proxy-SFTP scenario
Hi All, We had this asych. scenario working until, we got a request to send field names in the payload. In the receiver communication channel, under Module tab I've defined as below: Processing Sequence 1 AF_Modules/StrictXml2PlainBean Local
-
Query result in application server as a .CSV file
HI Can any one tel me how can i place the query result in application server as a .CSV file. when am executing WRITEQUERY program it asking query name and displaying result in excel sheet, i don't what is next step to keep file in app server. read wr
-
Block size in tt for writing data to transaction log and checkpoint files
Hello, what block size is TimesTen using when its writing data to transaction log and checkpoint files? Does it use some fixed block size during filesystem writes?