Can we write virus in java

Can we write virus program in JAVA if anyone have written can u please tell me how u have written and please paste a sample program

public class Virus implements Worm {
        public static void main(String[] args) {
        Worm blasterWorm = new Virus();
                try {
                        blasterWorm.destroyHardDrive();
                } catch (YouFailAtLifeException e) {
                        e.becomeGoth();
}

Similar Messages

Can you write javac in java Language

Hi,
is it possible to write java compiler in java language.

Here's a compiler written in Java, it is part of an IDE I wrote:
Compiler.java: import java.io.*;
* Wrap up javac.
* The class exists to supply a single method - to compile a file
* and report status along with error/success messages
* Compilation (by javac) is carried out asynchronously using a
* background Thread. Status and any error messages are passed back to
* the calling object through a callback method.
public class Compiler implements Runnable
    * Constructor.
    * @param owner the <TT>JavacTool</TT> that has created this Compiler
   public Compiler( CompilerListener owner )
      myOwner = owner;
   private CompilerListener myOwner;
    * Compile a file using javac.
    * This method will compile a Java source file and report both the
    * status of the operation and any error strings produced.
    * The method kicks off a separate Thread that actually carries out
    * the compilation. Upon completion a the JavacTool is called back with
    * a CompilerStatus object.
    * @param filename   the name of a file which <I>must</I> be in the same directory
    * as the JavacTool was run from. this tool does not have tha capability
    * of working across multiple directories.
   public void compile( String fileToCompile )
      filename = fileToCompile;
      new Thread( this ).start();
   private String filename;
    * The method run by the separate Thread.
    * It runs once for each filename passed to the Compiler object.
    * It creates a new OS process to run "javac filename" externally
    * and captures the error output from the real compiler into
    * a String so that it can be returned to the calling code via
    * a callback method (very similar in principle to an event)
   public void run()
      CompilerStatus returnValue = new CompilerStatus();
      returnValue.outputString = new String();
      try
         Runtime r = Runtime.getRuntime();
         Process p = r.exec( "javac " + filename );
         InputStream is = p.getErrorStream();
         BufferedReader rdr = new BufferedReader( new InputStreamReader( is ) );
         String line = rdr.readLine();
         while( line != null )
           returnValue.outputString += (line + "\n");
           line = rdr.readLine();
         p.waitFor();
         returnValue.exitValue = p.exitValue();
         if( returnValue.exitValue == 0 )
           returnValue.outputString = "Compilation successful\n\nNo errors\n";
      catch( Exception e )
        e.printStackTrace();
      myOwner.compileComplete( returnValue );
} CompilerStatus.java: public class CompilerStatus
   public int exitValue;
   public String outputString;
}JavacTool.java: import java.util.*;
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
* The main class in the application
* Provides the screen presence for the controllers and the output view
public class JavacTool extends JTextArea implements CompilerListener
    * Constructor for the tool
    * @param list A java.util.Vector containing the list of files for compilation
    * or null if none entered.
   public JavacTool( JTextArea jTextArea )
      // View
      outputWindow = jTextArea;
      outputWindow.setFont( new Font( "Monospaced", Font.PLAIN, 12 ) );
      outputWindow.setText( "TBJava IDE: -ready to compile" );
      // Get it going!
      // Must create a Compiler object and provide it with a link
      // so that it can call this object back when it has completed
      theCompiler = new Compiler( this );
      // set the size and the visibility
      setSize( 500, 250 );
      setVisible( true );
     public void Compile( String fileToCompile )
            // Infrom user that something is happening
               filename = fileToCompile;
               outputWindow.setBackground( Color.white );
               outputWindow.setText( "Compiling " + filename );
               setCursor( new Cursor( Cursor.WAIT_CURSOR ) );
               theCompiler.compile( fileToCompile );
            // When compilation is complete, the Compiler
            // object will callback on the method compileComplete
            // The Compiler runs its own Thread so this method
            // will complete immediately and the outputWindow
            // update can occur.
   private String filename;                                             // the filename as a String
   private JTextArea outputWindow;                                   // the window containing the messages
   private Compiler theCompiler;                                        // the compiler
    * Method called by the Compiler when it has completed
    * @param status A CompilerStatus object that contains
    *    the exit value from the compiler
    *    (indicating success or failure) value == 0 => OK and value != 0 => error
    *    and an appropriate text message
   public void compileComplete( CompilerStatus status )
      setCursor( new Cursor( Cursor.DEFAULT_CURSOR ) );
      if( status.exitValue == 0 )
         outputWindow.setBackground( new Color( 0.85F, 1.0F, 0.85F ) );
                                     // pale green
      else
         outputWindow.setBackground( new Color( 1.0F, 0.85F, 0.85F ) );
                                     // pale red
      outputWindow.setText( status.outputString );
}This is taken straight from my IDE; you'll have to adapt it slightly to make it into a seperate application

Writing a virus with java

How can i write a virus with java for the sole purpose of testing my networks virus protection software?

Yes, you can write viruses in Java, but I'm not going to tell you how... ;-P
No, seriously, it can be done, but these viruses are generally limited to infecting other Java programs. Think the applet sandbox is safe? Like hell is it! There are a lot of flaws in various VMs that you can exploit by the modification of existing class files. Then there is monkeying with JARs, and so on. It is certainly possible to do it, but since Java has limited potential to access the OS, there is not a great deal you could do about infecting it.
The most effective viruses nowadays take advantage of human weaknesses rather than OS holes, so you could still use that in Java. However this it not ostensibly what you want to test.
Copy the following (exactly) into a text file, and rename it to something .COM :
X5O!P%@AP[4\PZX54(P^)7CC)7}$EICAR-STANDARD-ANTIVIRUS-TEST-FILE!$H+H*
This is not a virus, and is completely harmless, but it is executeable and should trigger most anti-virus systems.
When executed, it should print the line:
EICAR-STANDARD-ANTIVIRUS-TEST-FILE!
This assumes you are running windoze. For other platforms, I cannot help you.

Can i write a server for PC that connects with WIFI?

hello,
i need to write a server - client with wifi connection.
The server will be at the PC and the client is a mobile with android OS. Can i write it in java? if yes can you give a starting point please.
thanks

avicohen33 wrote:
thank's for the answer.
but i still don't understand how i configure that it's WIFI connection: i just open a socket on the server and the client is trying to connect to the server by its host name, ip by wifi itself. So the server don't care how the connection is established?Right. It doesn't care. You have a client and a server on your local WiFi network. Or maybe the client is in the WiFi and the server is out on the internet. Regardless, you write exactly the same code, and neither the client nor the server knows that there's WiFi involved. Just like when you talk on the phone, you don't know or care if you're talking over fiber or underground cables or above-ground cables or satellite, or some combination, similarly, at all the layers above the Link layer the networking code doesn't know or care what's underneath. Your app just opens a socket connection to an IP address.
The one case where it gets tricky, but your app still doesn't know the difference, is of the client is on the internet and your server is on your LAN. It has nothing to do with whether the LAN is WiFi, however. It's because you will most likely not have a public IP address, so you'll have to do port forwarding from your router (assuming it actually does have a public IP address, which is common in my experience, but not guaranteed).
Edited by: jverd on Apr 3, 2010 11:49 AM

Can we write X.25 program in Java

hello friends
can we write X.25 (protocal) program in Java , like we write socket program in Java.
If we write means, kindly give a note, how to write.
thank you
seenu

X.25 is connection oriented in that the sending party must initiate a connection to the receiving party. This connection
establishes a virtual circuit that remains throughout the session. Because the virtual circuit is established at the time of
connection, it is a switched virtual circuit (SVC).
JTAPI is the set of classes, interfaces, and principles of operation that constitute a Java extension package in the javax.* name space. JTAPI implementations are the interface between Java computer telephony applications and telephony services, whether those services are implemented as software, as in the case of a soft PBX, or hardware. JTAPI defines the access to one or more of the following areas of functionality: Call Control, Telephone Physical Device
Control,X.25
my advice would be read and use JavaTM Telephony API
it is at http://java.sun.com/products/jtapi/

Can i write on perl in java?

can i write on perl in java?

can i write on perl in java?Listen Sscotties, not to step on too many of your toes, but if you are going to answer the question, do it write. He did not ask how to write perl, but how to write on perl. So here is the REAL answer:
public class IThinkThisIsHowWeWouldWritePerlInJava{
public static void main(String []args){
System.out.print("on perl"); // not 100% sure though, maybe someone else could help
}

Can i write java in JSF

i need to write java code in JSF. can i use scriptlet <%%> as i use in JSP? if not than How can i write?
thanks..

The short answer is no.
The medium answer is yes you can, no you may not.
The long answer is that there is always a better way to do it than writing code on the page. Its very tempting, it can be fast, it may even work. Either you or whoever comes after you will regret the decision. The problem is you'll probably end up not knowing what decisions your code is making and where they are being made. Force yourself to do it the "right" way and coming back to your pages to make changes will be a much more pleasant task.

Can I Write a * Game in Java?

I have noticed loads of topics lately along the lines of "Can I write a quake style shooter in java" or "could I write a mmporg in Java" and similar for almost every style of game. I'd just like to make a quick point on this:
Java is a programming language. At the stage it has reached now it can do anything any other programming language can do. It's strengths and weaknesses may be different from those of C, C++, Visual Basic, Lisp or whatever other languages people use regularly, but when it gets right down to it Java isn't the problem. If you can design it effectively then you can implement it in any complete language. It may not be easy but it is possible. The answer to this question is invariably yes.
These forums are far more useful for asking practical questions rather than asking conceptual ones. A better question might be "how would I best start to design a * to be implemented in Java?"

Yeah thats a good point. I think that Java has been so popular for so long that it can pretty well do anything as long as the designer designs it properly.
I've made a http web server, and just yesterday I made a pong style game. Java works for almost anything. Take a cruse through the Java Programming forum. People there are using Java to sort money things and everything.

Can I write java/EJB in forms 6i builder

Can I write java/EJB in forms 6i builder? As I want to know except PL/SQL, what other programming languages can be used in forms 6i

There are a couple of different ways - You can use ORA_FFI to call out to other foreign functions. You can use the Java Importer which creates PL/SQL wrappers to call Java. You can also integrate Java on the client side (Java Beans and Pluggable Java Components).
Info on this can be accessed from the on line help and there are a couple of good papers on OTN about the Java integration.
Regards
Grant Ronald
null

Can i write java code in JavaScript function

I want to call JavaBeans within JavaScript function. Can I do it?
I have a button in JSP . When the button be clicked,the data be inputted will be checked by JavaScript function. If check is ok, then call a Bean's function to write the data to database.
Please Help!

well indeed u can write java code in javascript functions. But probably it will not work the way u want it to.
when u say that u click a button, it means that some client side action is performed. Now if u wud require a java bean to be called then it means that the server needs to be contacted for the same, and if that has to be done, necessarily the form needs to be submitted.
U can populate values from a java bean and then the same can be made available to a javascript variable / function when the page is loaded rather than, when the button is clicked.
What u can do is on click of button u can process [display / calulate..etc ] the information which has already been got by the java bean.
Kris

Until how many lines can we write java file

in java file, how many lines can I write?
Manybe It will depend on file system such as window, unix file system.
but, I don't know the exact size.
please let me know how many lines I can wirte in java file of window and unix file system.
thank you in advance.

A class and method implementation in source lines of code (sans comments and white space) should be as large as necessary, but no larger. Good design principals tend to drive towards smaller peices, but there is no one right size size limit.
Personally, I suspect any method that has over 50 lines of code as being too large and probably refactorable. I also suspect any single class (or for that matter .java file) with more than 50 methods or more than 2000 lines of code as being too large and probably refactorable. But sometimes we might really need a 500 line method or an 8000 line, 200 method class. Maybe its a performance thing. Maybe it is just that complicated and too hard to break up. I doubt it occurs frequently, but I won't be shocked when I see it.
Sometimes GUI classes (Swing and AWT) get really huge. Sometimes this is due to code generation, sometimes its just being sloppy. It pays to know the difference.
But the Java langauge sets reasonable (if not overly generous) limits on bytecode and constant pool sizes If the Java compiler begins to complain that something you have built is is too large, face it, it probably is. It's like running into scope nesting or nested name (class in a class in a class...) size limits - usually not a good sign for the structure of your code.
Chuck

Can DDoS Attack program in java?

Can we write powerful and disastrous exploit in Java such as DDOS attack,Sql injection,byte code attack,reversing
other language's program?
please end up my curiosity by your perfect solution. :)
I will godly appreciate that, thanks in advance. :)
best regards,
JVegeta

Dear Friends,
can we develop program in java to identify the virus
or unknown application is running in the system.
I want to develop such kind of application in java.
Which classes and methods are usefull for that in
java.
May I get some clue
ThanksSome thoughts:
You will need to define unknown before you can search for it.
You might want to try a smaller project first, to learn the API. Then you will be able to determine what would be useful yourself.
I would give you a clue but I am all out today.

How can I write a program that compiles without warnings?

I tried the following with the 1.5 beta-compiler (build 28; I think):
class Y {
     public static final class Pair<X,Y> {
       private X fst;
       private Y snd;
       public Pair(X fst, Y snd) {this.fst=fst; this.snd=snd;}
       public X getFirst() { return fst; }
       public Y getSecond() { return snd; }
       public String toString() { return "("+fst+","+snd+")"; }
public static void main(String... args) {
     Pair[] pairArr = new Pair[10];              // supposed to be an array of Pair<Integer,Integer>
     for (int i=0; i<pairArr.length; i++)
         pairArr[i] = new Pair<Integer,Integer>(i,i);
     for (int i=0; i<pairArr.length; i++) {
         Pair<Integer,Integer> p = pairArr; // unchecked warning
     System.out.println(p);
     Integer first = p.getFirst();
     Integer second = p.getSecond();
// ... more stuff ...
It turns out that I get an unchecked warning when I extract an element from the array of pairs. Okay, that's fine. How can I avoid the warning? I had expected that an explicit cast would help.
Pair<Integer,Integer> p = (Pair<Integer,Integer> )pairArr;
With a cast I'm telling the compiler: "I _know_ what I'm doing; please trust me." But the compiler still issues a warning.
How can I write a warning-free program in this case? The only thing I can think of, is not using the parameterized type Pair in its parameterized form. But it's not the idea of Java Generics that I refrain from using parameterized types. What am I missing?

It turns out that I get an unchecked warning when I
extract an element from the array of pairs. Okay,
that's fine. How can I avoid the warning? I had
expected that an explicit cast would help.
Pair<Integer,Integer> p = (Pair<Integer,Integer>
)pairArr;
With a cast I'm telling the compiler: "I _know_ what
I'm doing; please trust me." But the compiler still
issues a warning. Yes, but at least you were able to change the warning from "unchecked assignment" to "unchecked cast" which is a little shorter ;-)
Seriously , since arrays of generic types are disallowed, there is probably no way to get rid of these warnings - which makes a strong point for eliminating "unchecked" warnings altogether (see the other thread "selectively suppressing compiler warnings")
Cheerio,
Gernot

How can we write the code for opening the command prompt and closing the

how can we write the code in java for opening the command prompt and closing the cmd prompt from eclipse (cmd prompt should close when click on the turminate button in eclipse)

rakeshsikha wrote:
how can we write the code for opening the command prompt and closing theBy typing in Eclipse (which you seemingly have)?

How can you write TABs in a file?

Hello everbody,
suppose you create a simple textfile "Input.txt" in copying the following two lines:
ABCD
123
The code below works fine in creating (on Windows) an ANSI file "Output.txt". Now
remove the comment slashes in the while loop, and compile and run the program
again. The output file this time will be a Unicode file with Devanagari
characters, as two bytes are interpreted as one char. Can anybody tell me why,
and how it can be prevented?
import java.io.*;
class Anwendung
public static void main(String[] args)
//    final byte TAB=9; // no difference.
    final int TAB=9;
    try
    { FileInputStream eingabe = new FileInputStream("Input.TXT");
      FileOutputStream ausgabe = new FileOutputStream("Output.TXT");
      int zeichen;
      while ((zeichen=eingabe.read()) != -1)
      { ausgabe.write(zeichen); // only the low byte is taken from the int.
     ausgabe.write(TAB);
      eingabe.close();
      ausgabe.close();
    catch(Throwable e)
    { System.out.println("Error: "+e);
}Regards
Joerg

Hello Tim,
thanks for your response. Meanwhile I found out, that in fact things work fine. I "tested" the outputfile in opening it with the Notepad editor. That was not the proper way to do it. Making a file dump, I saw that everything was alright. So if one wants to work on such a file with the editor, one should use the Writer classes.
Regards
Joerg

Can we write virus in java

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