File Class and Applets

Hello Java Fans!!
I was wondering if anyone knows how to make Applets read Files
from the hard drive on a local machine. (Or where to find
information about it?)
Thanks a bunch in advance!
A.

Hi,
How about accessing a directory on the web server, where the applet file resides? I would like to display
the contents of some web server directories on the client's browser in an applet, but I keep running into
the applet security restrictions. I am using Java 1.1 as my language version, this way my users don't have
to install the Java plug-in for their browser. I would rather not use signed applets or anything like that.
Thanks,
Steve Cromer

Similar Messages

Where do i place my html files,classes and Java files

Can any one plz help me out here. I'm using Tomcat3.2.1 to
run my servlets, I have written the servlets and gotten
tomcat to run as well. What confuses me now is where my
files should be placed.
- Do i have to create a special directory to contain my html
files ?
- another directory for my servlet classes ?
- how about my .java files ?
- and how should i call my servlet from the html code ?
HEEEEEEEEEEEEEEEEEEEEELLLLLLLLLLLLLLPPPPPPPPPPPP!!!!!!!!!!!!!!!

hi,
you can my post here http://forum.java.sun.com/thread.jsp?forum=33&thread=302433

File class and an executable method?

Unix and Windows files have attributes that indicate if they are executable. Why doesn�t Java have a �canBeExecuted� method in its File class?
This is a question in an assignment that I am doing and I don't can't really figure out why there is no methos like this.
Please help, and and all ideas would be most appreciated.

I give up - where does windows have that?ntfs? what version of windows are you on! :)
right-click->properties->security ...Sorry -- I picked a file at random and did
rightclick->properties. There's no Security tab on my
Windows (2000) computer.Probably because "Use simply file sharing" is checked in
some tab (can't find it because I don't have access on this
computer). I think it is under "Tools->Folder Options->View->
Use Simple File Sharing". (under "Tools" in explorer).

Viewing the *.class and applet.class

First of all: I use Java on Windows 98 (path c:\jdk1.1.8\bin\java and c:\jdk1.1.8\bin\appletview).
My problems are:
1. I cann't view my *.class files. When I try to open HalloWorld.class with c:\jdk1.1.8\java I just only see the command window of DOS for a while and then nothing.
2. When *.class is configured to be viewed by c:\jdk1.1.8\java every one will have problem viewing applet_file.class.
Please help!

Hmm.... if this is not a trick question: no one can "view" a class file. it is the compiled version of a "YourProgram.java" file. to edit a program, you edit the "text" file ( YourProgram.java ) and NOT the YourProgramName.class file which is created by the compiler when you compile a java file. In short, you cannot edit a .class file; you edit the .java file. good luck!

'Basic' external actionscript file/class usage

Hey All,
I'm a bit baffled by something that should, in my humble opinion, be a piece of cake...
The setup is really easy. A simple application with a single textinput, a button and a text component.
When the button is clicked a function is called that sets the text from the inputfield to the text component.
code:
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">
    <mx:Script>
        <![CDATA[
            public function click(inputText:String):void {
                outPutTxt.text = inputText;
        ]]>
    </mx:Script>
    <mx:TextInput x="10" y="10" id="inputTxt"/>
    <mx:Button x="178" y="10" label="Button" id="Btn" click="{click(inputTxt.text)}"/>
    <mx:Text x="251" y="12" text="Text" id="outPutTxt"/>
</mx:Application>
As I said, really easy.
What I want to do is put the function 'click' into an external actionscript file or class. And still be able to, from within the external file, modify the outPutTxt stuff.
I'm aware that I could create a public bindable variable inside of the external file and then bind the outPutTxt to that variable, but I would really like to be able to 'simply' force the value...
Is that possible? If yes: how plix
If it's not possible, I'd like to know as well! And in that case, how would I then re-use the same instance of a class/file in multiple seperate components? Say I got a 'login' thingie where a user logs in (data stored externally in a seperate actionscript file/class) and I want to re-use that information on other pages... Or is this done automatically?
Any and all comments/answers are higly appreciated!
Pieter

Hey Levancho,
thanks for your answer!! Much appreciated.
However, the code you proposed threw an error...
Errormessage:
ReferenceError: Error #1069: Property outPutTxt not found on controls.Control and there is no default value.
    at controls::Control/btnClick()[C:\...\FlexTest_03\src\controls\Control.as:13]
    at FlexTest_03/__Btn_click()[C:\...\FlexTest_03\src\FlexTest_03.mxml:11]
So I tried something else where I bind the text in my OutPutTxt to a variable inside of the external class file.
Code:
Class:
package controls
    public class Control
        [Bindable]
        public var outPutText:String = "";
        public function Control()
        public function btnClick(inputText:String):void {
            this.outPutText = inputText;
Mxml:
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">
    <mx:Script>
        <![CDATA[
            import controls.Control;
            [Bindable]
            private var control:Control = new Control();
        ]]>
    </mx:Script>
    <mx:TextInput x="10" y="10" id="inputTxt"/>
    <mx:Button x="178" y="10" label="Button" id="Btn" click="{control.btnClick(inputTxt.text)}"/>
    <mx:Text x="251" y="12" id="outPutTxt" text="{control.outPutText}"/>
</mx:Application>
And this basically did what I wanted to do... so I just need to do some major binding between my application and the classes I'll be using for my business logic.
Now for something else entirely...
Is there a way for me to pass the instance of my class between flex components?
Pieter

Reading and writing to a text file from an Applet

I'm a novice java programming with very little formal programming training. I've pieced together enough knowledge to do what I've wanted to do so far...
However, I've been unable to figure out how to read and write to a text file from an Applet (I can do it from a normal java program just fine). Here is a simple example of what I'd like to do (you can also look at it on my website: www.stat.colostate.edu/~leach/test02/test02.html). I know that there is some problem with permission/security but I'm not smart enough to understand what the error messages are telling or understand the few books I have. If anyone can tell me how to get this applet to work, or direct me to some referrences that would help me out I'd really appreciate it.
Thanks,
Andy
import java.applet.Applet;
import java.net.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import java.io.*;
public class test02 extends Applet {
public Button B_go;
public GridBagConstraints c;
public void init() {
this.setLayout(new GridBagLayout());
c = new GridBagConstraints();
c.fill = GridBagConstraints.BOTH;
B_go = new Button("GO");
c.gridx=1; c.gridy=0; c.gridwidth=1; c.gridheight=1;
c.weightx = c.weighty = 0.0;
B_go.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
print_stuff();
setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));
this.add(B_go,c);
public static void print_stuff() {
try{
File f = new File("test02.txt");
PrintWriter out = new PrintWriter(new FileWriter(f));
out.print("This is test02.txt");
out.close();
}catch(IOException e){**/}
}

I have almost the exact same problem, and I am in the same situation as you are with respects to the language.
I am simply trying to create a file and output some garbage to it but my applet always spits back a security violation. I've tried eliminating the restrictions on the applet runner I use but I still get the error.
My method:
debug = new Label() ;
debug.setLocation( 20, 20 ) ;
debug.setSize( 500, 15 ) ;
add( debug ) ;
// output
try
     OutputStream file = new FileOutputStream( new File( "" + getCodeBase() + "output.txt" ) ) ;
     byte[] buffer = { 1, 2, 3, 4, 5 } ;
     file.write( buffer ) ;
     file.close() ;
} catch( Exception e )
     debug.setText( e.toString() ) ;
     Can anyone tell why this isnt working?

Input and Output to file in an applet

Is it possible to read and write data from and to a txt file when running an applet so that some initial data can be used in the applet program? Can I do the same thing as in applications? Where I just use FileInputStream/InputStreamReader classes and the FileOutputStream/OutputStreamWriter classes. Thanks.

The answer is yes... and no. An applet can't (by default) access the host's operating system or file system. This is part of the built in security of the Java language. There are cases, though, where an applet can get access to the filesystem and that is through signed applets. To create a signed applet, just JAR your sourcecode into a *.jar file and use the jarsigner utility to generate a certificate for your jar file (and applet). I'm not completely up to date on what is and isn't allowed in signed applets, but a good place to find out is:
http://java.sun.com/docs/books/tutorial/applet/problems/index.html

Applet & File Class

Hello Java Fans!
I have an applet that is embedded in an HTML file. The applet is
just a button that launches a Frame Window. Now the Frame window
has a 'File Class' object. If I test it in the appletviewer
everything works fine and I get the:
File length(), path, absolute path etc ... to be displayed in
the 'List Object' Window.
However, if I test it in the IE Browser, the Frame opens fine but
no information is diplayed at all.
Could somebody give me a hint please? Does it have something to do
with File permissions maybe because it's launched from a browser?
Thanks a bunch in advance. A.

Hi,
Applets will always have a problem when they are trying to execute an external program, or a file on the user's machine. A security problem will occur.
Check in the systray down on the right on a Windows machine and pull up the java console. This should show all exceptions that occurr in an applet.
You will probably have to get your applet signed. See help about signing applets, or if you are trying to get the applet off the remote server where your code is stored on, rmi or a client/server program can be used to get your file.

JAR files and Applets

I'm completely new to the whole .jar thing so i was wondering, after i package an applet and its respected classes within a .jar archive. what information should be in the manifest file?
lets say the applet is called, AppletText.class , and it makes use of the classTest.class class.
im using netbeans and i made it generate manfest file automaticaly. this is what it gives.
Manifest-Version: 1.0
Created-By: NetBeans IDE
Specified-By: TestJar.jarContent
when i click to execute the jar, i get an error message
Failed to load Main-Class manifest attribute from
C:\Documents and Settings\xxxxxxxxxx\xxxxxxxxxxxxx\xxxxxxxxxxx\AppletJartest.jar
x's are used to censor filenames
so how do i make it execute the way i want? (execute the applet and allow use of the class)

Just for reference may be. Sorry if it does not met your need..:
How to jar a packaged java class? (I write this so I don't forget to create jar file again :-( ..)
Consider the package is under the folder c:\classes and you have folder ml where you write several packages such as
- package ml.gui (c:\classes\ml\gui)
- package ml.algorithm (c:\classes\ml\algorithm)
- package ml.utils (c:\classes\ml\util)
- etc..
- and a main class, lets say "tool" as package under ml\gui (package ml.gui.tool)
so the folder c:\classes actually contains folder ml and ml has another folders.
Step to create packaged class jar:
Step1: Create a "Manifest.mf" file at least contains the following text:
Manifest-Version: 1.0
Main-Class: ml.gui.tool
Created-By: XXXXXX
Note:
* tool is the main class that will be executed
* the purpose of manifest can be found anywhere
in internet
Step2: Open MSDOS to c:\classes
Step3:
Execute the following command:
jar -cvfm <jarfiletobecreated.jar> Manifest.mf <packaged class>
In my case, the command is:
jar -cvfm ml.jar Manifest.mf ml/*
The above steps should create a jar file ml.jar and can be executed with command java -jar ml.jar or write batch file that contains the command.
Correct if i'm wrong.

JAR Files and Applets with Java Plug-In

This seems to be a basic question, but I can't figure it out! I have a jar file that contains all my class files for my applet. The jar file is in the same directory as the following html file:
<html>
<body>
<OBJECT classid="clsid:8AD9C840-044E-11D1-B3E9-00805F499D93"
WIDTH = 700 HEIGHT = 510 codebase="http://java.sun.com/products/plugin/1.3.1/jinstall-131-win32.cab#Version=1,3,1,0">
<PARAM NAME = ARCHIVE VALUE = "myFiles.jar" >
<PARAM NAME = CODE VALUE = "MainView.class" >
<PARAM NAME="type" VALUE="application/x-java-applet;jpi-version=1.3.1">
<PARAM NAME="scriptable" VALUE="false">
</OBJECT>
</body>
</html>
I've checked the jar file, it's the same name. MainView.class is most certainly in the jar file - yet everytime I open the page up, I get the class not found error:
java.lang.ClassNotFoundException: java.io.FileNotFoundException
MainView.class (The system cannot find the file specified)
If I don't jar the files, the applet works fine - but I want to jar them as it's some 20 class files. What am I doing wrong?

I've had a similar problem where it pops up the Java Extension Installation window, and starts downloading. Everything appears normal, but when it tries to run the applet it gets "load: class <className> not found" where <className> is the name of the class in my CODE parameter.
It appears that on occasion the download of the jar gets cut off. When I searched the browser's cache, I find a jar file that has fewer bytes than it should. In order to initiate a retry, you have to delete the jar file from your browser's cache, close all your browser windows so that the Plug-in with its truncated jar file stops running, and load the HTML page again. It appears that it checks the timestamp of the jar file in your cache and the one on the server and decides that it doesn't need to download it again. But if you delete it from your cache, it forces a retry.
I never have this problem when I open from my hard drive. I've never had the problem with a cable modem connection. I've had it once from a corporate LAN hitting an internet server (ie., outside corporate WAN). I've had people report the problem with dial-up connections. My theory is that whatever Sun is using to download the applet is more sensitive than either HTTP download or FTP.
Has anybody else experienced this problem? Is there anything you can do about it? I couldn't find a bug report on it. Is there one?

Using java class and variables declared in java file in jsp

hi everyone
i m trying to seperate business logic form web layer. i don't know i am doing in a right way or not.
i wanted to access my own java class and its variables in jsp.
for this i created java file like this
package ris;
import java.sql.*;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public class NewClass{
    public static void main(String args[]){
        Connection con = null;
        ResultSet rs=null;
        Statement smt=null;
        try{
            Class.forName("com.mysql.jdbc.Driver").newInstance();
            con=DriverManager.getConnection("jdbc:mysql:///net","root", "anthony111");
            smt=con.createStatement();
           rs= smt.executeQuery("SELECT * FROM emp");
           while(rs.next()){
            String str = rs.getString("Name");
            }catch( Exception e){
                String msg="Exception:"+e.getMessage();
            }finally {
      try {
        if(con != null)
          con.close();
      } catch(SQLException e) {}
}next i created a jsp where i want to access String str defined in java class above.
<%--
    Document   : fisrt
    Created on : Jul 25, 2009, 3:00:38 PM
    Author     : REiSHI
--%>
<%@page import="ris.NewClass"%>
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
   "http://www.w3.org/TR/html4/loose.dtd">
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>JSP Page</title>
    </head>
    <body>
        <h1><%=str%></h1>
    </body>
</html>I wanted to print the name field extracted from database by ResultSet.
but it gives error cannot find symbol str.
please help me to find right way to do this.
i am using netbeans ide.

Very bad approach
1) Think if your table contains more than one NAMEs then you will get only the last one with your code.
2) Your String is declared as local variable in the method.
3) You have not created any object of NewClass nor called the method in JSP page. Then who will call the method to run sql?
4) Your NewClass contains main method which will not work in web application, it's not standalone desktop application so remove main.
Better create an ArrayList and then call the method of NewClass and then store the data into ArrayList and return the ArrayList.
It should look like
{code:java}
package ris;
import java.sql.*;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public class NewClass{
    public static ArrayList getNames(){
        Connection con = null;
        ResultSet rs=null;
        Statement smt=null;
        ArrayList nameList = new ArrayList();
        try{
            Class.forName("com.mysql.jdbc.Driver").newInstance();
            con=DriverManager.getConnection("jdbc:mysql:///net","root", "anthony111");
            smt=con.createStatement();
           rs= smt.executeQuery("SELECT * FROM emp");
           while(rs.next()){
            nameList.add(rs.getString("Name"));
           return nameList;
            }catch( Exception e){
                String msg="Exception:"+e.getMessage();
               </code><code class="jive-code jive-java"><font>return nameList;</code><code class="jive-code jive-java">
            }finally {
      try {
        if(con != null)
          con.close();
      } catch(SQLException e) {}
      </code><code>return nameList;</code>
<code class="jive-code jive-java">    }

XML file in the form of .config file how to convert it to class and store it in single object

Hi,
I have a config file in which i have to convert it to class and get an object.
example:
<?xml version="1.0" encoding="utf-8" ?>
<xyz xmlns="">
<Container name ="Basic">
<Connectivity user="" server="" protocol="udp"/>
<Connectivity user="" server="" protocol="udp"/>
</Container>
<Container name ="Cp">
<settings version="1.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.counterpath.com/cps">
<domain name="audio">
<section name="headset">
<setting name="audio_in_agc_enabled " value="1"/>
</section>
<section name="incoming">
<setting name="use_agc" value="1"/>
</section>
<section name="vad">
</section>
</domain>
<domain name="system">
<section name="qos">
<setting name="audio" value="tos 46"/>
</section>
<section name="dtmf">
<setting name="force_send_in_band" value="0"/>
<setting name="minimum_rfc2833_play_time" value="40"/>
</section>
<section name="network">
<setting name="dtx_enabled" value="0"/>
</section>
<section name="diagnostics">
<setting name="enable_logging" value="1"/>
<setting name="log_level" value="Error"/>
</section>
<section name="general">
<setting name="add_OS_version_to_user_agent_header" value="1"/>
</section>
<section name="indialog_notify">
<setting name="enable_indialognotify" value="1"/>
</section>
</domain>
<domain name="rtp">
<section name="2833">
<setting name="enabled" value="1"/>
<setting name="packet_time_in_ms" value="60"/>
<setting name="payload_number" value="101"/>
</section>
<section name="inactivity">
<setting name="timer_enabled" value="0"/>
</section>
</domain>
<domain name="proxies">
<section name="proxy0">
</section>
<section name="proxy1">
</section>
</domain>
<domain name="ggg">
<section name="device">
<setting name="use_headset" value="1"/>
<setting name="rrr" value="1"/>
<setting name="eee" value="480"/>
<setting name="eme" value="hhh"/>
<setting name="headset_name" value="vvv"/>
<setting name="manual_audio_devices_configure" value="0"/>
<setting name="audio_in_device" value=""/>
<setting name="audio_out_device" value=""/>
<setting name="ringer_device" value=""/>
</section>
<section name="system">
<setting name="export_settings" value="EndpointSettings.xml"/>
<setting name="enable_export_settings" value="0"/>
<setting name="log_level_AbstractPhone" value="0"/>
<setting name="log_level_Audio" value="0"/>
<setting name="log_level_Auto Configuration" value="0"/>
<setting name="log_level_CCM" value="0"/>
<setting name="log_level_Conferencing" value="0"/>
<setting name="log_level_Contacts" value="0"/>
<setting name="log_level_DNS" value="0"/>
<setting name="log_level_GUI" value="0"/>
<setting name="log_level_Jitter" value="0"/>
<setting name="log_level_Licensing" value="0"/>
<setting name="log_level_Media" value="0"/>
<setting name="log_level_Privacy" value="0"/>
<setting name="log_level_RTP" value="0"/>
<setting name="log_level_STUN" value="0"/>
<setting name="log_level_Security" value="0"/>
<setting name="log_level_Storage" value="0"/>
<setting name="log_level_Transport" value="0"/>
<setting name="log_level_USB Devices" value="Info"/>
<setting name="log_level_Utilities" value="0"/>
<setting name="log_level_Video" value="0"/>
<setting name="log_level_Voice Quality" value="0"/>
<setting name="log_level_XMPP" value="0"/>
<setting name="log_level_Endpoint" value="6"/>
</section>
<section name="beeptone">
<setting name="play_locally" value="0"/>
<setting name="enable_beeptone" value="1"/>
<setting name="beeptone_file" value="beep.wav"/>
<setting name="beeptone_timeout" value="30000"/>
</section>
<section name="dtmf">
<setting name="play_locally" value="1"/>
<setting name="pause_start_stop_dtmf" value="100"/>
</section>
<section name="control">
<setting name="auto_answer" value="0"/>
</section>
<section name="ctrol">
<setting name="auto_ans" value="0"/>
</section>
</domain>
</settings>
</Container>
</xyz>
Please help me out in creating an object from it.
Thanks,
Hiranmayee

It's one of those things you usually start from the other end.
IE with a class and then serialise / deserialize to xml.
Because you have a namespace in there:
<settings version="1.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.counterpath.com/cps">
I think you will find linq to xml will have issues with that.
You could still use xpath to pick data out of there and there's been a thread on the c# forum recently which is relevent:
https://social.msdn.microsoft.com/Forums/vstudio/en-US/2dc0581e-f2fd-4fd3-89ee-e59280c398e6/read-xml?forum=csharpgeneral
Why do you want to turn that into an object?
By the way.
This isn't a wpf question and you should probably have posted it on the c# forum.
Hope that helps.
Recent Technet articles: Property List Editing;
Dynamic XAML

I have been getting java.lang.ClassNotFoundException: ZeroApplet.class and java.lang.ClassNotFoundException: JavaToJS.class crashes with JRE version 1.6.0_26-b03-384-10M3425 VM executing a Java Applet. Is Apple aware of this problem? No longer supported?

My web page uses a Java Applet to allow my visitors to replay chess games; the Chess Viewer Deluxe applet was written by Nikolai Pilafov some time ago and has been working properly for some time (until recently). I don't monitor this part of my site regularly so I am not sure when it began to fail. On his web site [http://chesstuff.blogspot.com/2008/11/chess-viewer-deluxe.html] he has a link to check LiveConnect object functionality (which fails for OBJECT tags). His recommendation is to "seek platform specific support which might be available from the JRE developers for your platform".
I have been getting java.lang.ClassNotFoundException: ZeroApplet.class and java.lang.ClassNotFoundException: JavaToJS.class crashes with JRE version 1.6.0_26-b03-384-10M3425 VM executing a Java Applet. Until I checked the LiveConnect object functionality, I was unable to identify the source of the console error messages. This does seem to be the smoking gun.
Is Apple aware of this problem? Are these classes no longer supported? Has anyone else had this problem? You can attempt to recreate the problem locally by going to my web page: http://donsmallidge.com/DonSmallidgeChess.html
Thanks in advance for any help you can provide!
Abbreviated Java Console output:
Java Plug-in 1.6.0_26
Using JRE version 1.6.0_26-b03-384-10M3425 Java HotSpot(TM) 64-Bit Server VM
load: class ZeroApplet.class not found.
java.lang.ClassNotFoundException: ZeroApplet.class
    at sun.applet.AppletClassLoader.findClass(AppletClassLoader.java:211)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
    at sun.applet.AppletClassLoader.loadClass(AppletClassLoader.java:144)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
    at sun.applet.AppletClassLoader.loadCode(AppletClassLoader.java:662)
    at sun.applet.AppletPanel.createApplet(AppletPanel.java:807)
    at sun.plugin.AppletViewer.createApplet(AppletViewer.java:2389)
    at sun.applet.AppletPanel.runLoader(AppletPanel.java:714)
    at sun.applet.AppletPanel.run(AppletPanel.java:368)
    at java.lang.Thread.run(Thread.java:680)
load: class JavaToJS.class not found.
java.lang.ClassNotFoundException: JavaToJS.class
    at sun.applet.AppletClassLoader.findClass(AppletClassLoader.java:211)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
    at sun.applet.AppletClassLoader.loadClass(AppletClassLoader.java:144)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
    at sun.applet.AppletClassLoader.loadCode(AppletClassLoader.java:662)
    at sun.applet.AppletPanel.createApplet(AppletPanel.java:807)
    at sun.plugin.AppletViewer.createApplet(AppletViewer.java:2389)
    at sun.applet.AppletPanel.runLoader(AppletPanel.java:714)
    at sun.applet.AppletPanel.run(AppletPanel.java:368)
    at java.lang.Thread.run(Thread.java:680)

I just went up to check the LiveConnect object functionality page AND IT WORKED THIS TIME! I must confess, this is very mysterious. I will do some more checking and reply here if I can determine why it is working now (and more importantly, why it didn't work before).

Why java file name and class name are equal

could u explain why java file name and class name are equal in java

The relevant section of the JLS (?7.6):
When packages are stored in a file system (?7.2.1), the host system may choose to enforce the restriction that it is a compile-time error if a type is not found in a file under a name composed of the type name plus an extension (such as .java or .jav) if either of the following is true:
* The type is referred to by code in other compilation units of the package in which the type is declared.
* The type is declared public (and therefore is potentially accessible from code in other packages).
This restriction implies that there must be at most one such type per compilation unit. This restriction makes it easy for a compiler for the Java programming language or an implementation of the Java virtual machine to find a named class within a package; for example, the source code for a public type wet.sprocket.Toad would be found in a file Toad.java in the directory wet/sprocket, and the corresponding object code would be found in the file Toad.class in the same directory.
When packages are stored in a database (?7.2.2), the host system must not impose such restrictions. In practice, many programmers choose to put each class or interface type in its own compilation unit, whether or not it is public or is referred to by code in other compilation units.

Nested classes and separate files in Javadoc...

Hello. I am writing an application, and it has several .java files, and some of the classes contained therein contain nested classes, for example
ClassOne.java
class ClassOne
// stuff
   class innerClassOne
      //more stuff
}ClassTwo.java
class ClassTwo
// stuff
   class innerClassTwo
      //more stuff
}What I want to do is generate documentation like the online java documentation for my app, that is, documentation that will contain ALL the classes and nested classes involved, and link everything that comes in java already to the sun online java docs.
I've figured out the -link command for javadoc, and I can make that work, but I've run into some other snags.
1.) Javadoc isn't finding or documenting my nested classes, despite them being marked up. Google does not wish to help.
2.) Some classes reference other classes of mine that aren't conatined in the same .java file, but do exist in their own .java files in the dame local directory. Javadoc does not like this, and gives errors.
3.) Running javadoc on one file at a time overwrites the old file's documentation, thus I cannot seem to get an index.html javadoc file that links to all my classes, nor can I get the classes to link to each other.
What do I need to do to fix these?

So this means a nested static inner class CANNOT refer to its own instanced variables, like a normal static method, but CAN refer to its outer class instanced variables?No, it means that a static nested class cannot refer to instance variables of its enclosing class. Example:public class Foo {
    int i;
    static class Bar {
        int j = i; // WRONG! Bar class is static context
}~

File Class and Applets

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