How to compile java programs? There is no javac for me!

Hi, I'm starting to learn java and downloaded the java 1.4.0.1 standard edition from this website. However, after I installed the program, there is no javac to be found while there is a java.exe. I need javac to compile my program before I can interpret it but it is nowhere to be found!
Did I download the wrong SDK version? I thank anyone in advance who can help me in the right direction!

You must have the SDK to create programs. The Jre is a component of the SDK that can be downloaded separately if you only want to run programs.
SDK downloads from here, use the row "Windows (all languages, including English)" and be sure to select the SDK COLUMN, not the JRE:
http://java.sun.com/j2se/1.4/download.html

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How to compile java programs in j2EE 1.4 SDK

hi,
i HAVE JUST INSTALLED NEW J2EE 1.4 SDK , IT HAS BEED INSTALLED SUCCESFULLY BUT I AM UNABLE TO COMPILE JAVA PROGRAMS WHICH I USED TO RUN IN SDK 1.4 ,OR EVEN NEW WRITTEN EXAMPLES. CAN ANYONE PLZ HELP ME.

J2EE by itself is not capable of compiling Java. It requires that a J2SDK be installed first - this is what compiles and runs Java programs. Did you install the combination J2SDK and J2EE, or just the J2EE?
If both are installed, then you should be able to compile and run as you used to..

Compiling Java Program thro EXEC

hi..
I want to compile java programs programatically. I am using exec for that. The problem is there is a error in the i am no getting any message from that Process .will u help me how to solve this
URGENT
pyari
Code Snippet
          try
                              String command = "cmd /c javac -classpath c:\\j2ee\\home\\ejb.jar -d "+
                              "c:\\javapr~1\\WeblogicEJBComplier\\tempBuild "+
                              "C:\\j2ee\\home\\demo\\ejb\\cart\\CartClient.java";
     System.out.println(command);
     Runtime rnt = Runtime.getRuntime();
                              Process prs = rnt.exec(command);
                              BufferedReader bfr = new BufferedReader(new InputStreamReader(prs.getInputStream()));
                              String str = bfr.readLine();
                              System.out.println(str);
                              while(str!=null)
                                   System.out.println(str) ;
                                   str = bfr.readLine();
          }catch(Exception eo)
               System.err.println(eo);

javac writes the errors in stderr, not in stdout.
So replace getInputStream() with getErrorStream()...

How to call java program by HTML page

Hi guys,
I'm new java programer and want to build an HTML page to access to ORACLE database on NT server by JDBC, Can anyone give me a sample?
I already know how to access database by JDBC, but I don't know how to call java program by HTML page.
If you have small sample,pls send to me. [email protected], thanks in advance
Jian

This code goes with the tutorial from this web page
http://java.sun.com/docs/books/tutorial/jdbc/basics/applet.html
good luck.
* This is a demonstration JDBC applet.
* It displays some simple standard output from the Coffee database.
import java.applet.Applet;
import java.awt.Graphics;
import java.util.Vector;
import java.sql.*;
public class OutputApplet extends Applet implements Runnable {
private Thread worker;
private Vector queryResults;
private String message = "Initializing";
public synchronized void start() {
     // Every time "start" is called we create a worker thread to
     // re-evaluate the database query.
     if (worker == null) {
     message = "Connecting to database";
worker = new Thread(this);
     worker.start();
* The "run" method is called from the worker thread. Notice that
* because this method is doing potentially slow databases accesses
* we avoid making it a synchronized method.
public void run() {
     String url = "jdbc:mySubprotocol:myDataSource";
     String query = "select COF_NAME, PRICE from COFFEES";
     try {
     Class.forName("myDriver.ClassName");
     } catch(Exception ex) {
     setError("Can't find Database driver class: " + ex);
     return;
     try {
     Vector results = new Vector();
     Connection con = DriverManager.getConnection(url,
                              "myLogin", "myPassword");
     Statement stmt = con.createStatement();
     ResultSet rs = stmt.executeQuery(query);
     while (rs.next()) {
          String s = rs.getString("COF_NAME");
          float f = rs.getFloat("PRICE");
          String text = s + " " + f;
          results.addElement(text);
     stmt.close();
     con.close();
     setResults(results);
     } catch(SQLException ex) {
     setError("SQLException: " + ex);
* The "paint" method is called by AWT when it wants us to
* display our current state on the screen.
public synchronized void paint(Graphics g) {
     // If there are no results available, display the current message.
     if (queryResults == null) {
     g.drawString(message, 5, 50);
     return;
     // Display the results.
     g.drawString("Prices of coffee per pound: ", 5, 10);
     int y = 30;
     java.util.Enumeration enum = queryResults.elements();
     while (enum.hasMoreElements()) {
     String text = (String)enum.nextElement();
     g.drawString(text, 5, y);
     y = y + 15;
* This private method is used to record an error message for
* later display.
private synchronized void setError(String mess) {
     queryResults = null;
     message = mess;
     worker = null;
     // And ask AWT to repaint this applet.
     repaint();
* This private method is used to record the results of a query, for
* later display.
private synchronized void setResults(Vector results) {
     queryResults = results;
     worker = null;
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     repaint();

Code to compile java program

hello,
i am studying msc(information systems) 2 years course.
this is my first semister.i am doing prof\ject in java.
TITLE:Designing editor for java in java.
I want to know how to compile a program written in the editor.i will feel very much happy,if u could tell me the suggestion.And alse running the class file.
thanking you...

Hi rajesh!
First you need a java development kit (jdk).
If you didn't get it yet you can download the actual version on this page (just search for "download").
If you've installed the jdk make sure that the path where you installed your jdk is set to your systems path value (windows)
you can put it in by editing your autoexec bat or by giving the following order to your dos box:
1.) PATH (returns the actual path settings)
2.) SET PATH old values, [...]\jdk\bin
After having done this you should reboot your system.
Now you can change the directory to your programs path and call:
JAVAC yourfile.java
this compiles your program
JAVA yourfile
(without any file extension!!) runs your program
It might be useful to download the API Documentation, where the jdk tools are all descripted!!
hope it helps,
Thof

HELP for Compile java programe !

Hello All,
i want to make java programe by which i can compile java programes
and when i compile java programe from my programe then
i shoul get compiled status means programe compile successfuly
or not compile.
if any example i m thanksfull.
onlyforjava.

how about if compile fail?
the process obj seems return value 0 as it run successful.
I haven't try this, but I have experienced the process obj returns 0 if the executed command has some routine to handle error cases, in which, error will not halt the system.
So, I recommand the following scenario.
1. let say, if your java is test.java. check the existence of file test.class.
If, it exists, get its modified time.
2. compile the java code with
Procress p = Runtime.exec(new String[]{"javac", "test.java"});
3. get the error string if any.
InputStream in = new BufferedInputStream(p.getInputStream());int read;while ((read = in.read()) != -1){ System.out.println((char)read);}
4. handle error with the exitValue
if (p.exitValue() != 0){ System.out.println("warning.");}
5. check again the file test.class if it is a newly created file.
6. if it is newly created, compile success. Else, failed.

How to use java programe in oracle form

Hello Expert,
My Config is : -
Forms [32 Bit] Version 11.1.1.3.0 (Production)
Jdeveloper - 10.1.3
I want to use the java programe in form builder. I create the one java class in Jdeveloper -
package demo;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.net.UnknownHostException;
public class get_info{
   public static void main(String[] args){
   ch_add();
   public static void ch_add()
InetAddress ip;
try {
ip = InetAddress.getLocalHost();
/*System.out.println("Current IP address : " + ip.getHostAddress()); */
NetworkInterface network = NetworkInterface.getByInetAddress(ip);
byte[] mac = network.getHardwareAddress();
/*System.out.print("Current MAC address : ");   */
StringBuilder sb = new StringBuilder();
for (int i = 0; i < mac.length; i++)
sb.append(String.format("%02X%s", mac[i], (i < mac.length - 1) ? "-" : ""));
System.out.println(sb.toString());
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (SocketException e){
e.printStackTrace();
and this into Formweb.cfg and default.env and also add into Form_class_path. After that i import this java into forms.
Code genertated -
PACKAGE BODY get_info IS
-- DO NOT EDIT THIS FILE - it is machine generated!
args   JNI.ARGLIST;
-- Constructor for signature ()V
FUNCTION new RETURN ORA_JAVA.JOBJECT IS
BEGIN
    args := NULL;
    RETURN (JNI.NEW_OBJECT('demo/get_info', '()V', args));
END;
-- Method: main ([Ljava/lang/String;)V
PROCEDURE main(
    a0    ORA_JAVA.JARRAY) IS
BEGIN
    args := JNI.CREATE_ARG_LIST(1);
    JNI.ADD_OBJECT_ARG(args, a0, '[Ljava/lang/String;');
    JNI.CALL_VOID_METHOD(TRUE, NULL, 'demo/get_info', 'main', '([Ljava/lang/String;)V', args);
END;
-- Method: ch_add ()V
PROCEDURE ch_add IS
BEGIN
    args := NULL;
    JNI.CALL_VOID_METHOD(TRUE, NULL, 'demo/get_info', 'ch_add', '()V', args);
END;
-- Method: wait (J)V
PROCEDURE wait(
    obj   ORA_JAVA.JOBJECT,
    a0    NUMBER) IS
BEGIN
    args := JNI.CREATE_ARG_LIST(1);
    JNI.ADD_LONG_ARG(args, a0);
    JNI.CALL_VOID_METHOD(FALSE, obj, 'demo/get_info', 'wait', '(J)V', args);
END;
-- Method: wait ()V
PROCEDURE wait(
    obj   ORA_JAVA.JOBJECT) IS
BEGIN
    args := NULL;
    JNI.CALL_VOID_METHOD(FALSE, obj, 'demo/get_info', 'wait', '()V', args);
END;
-- Method: wait (JI)V
PROCEDURE wait(
    obj   ORA_JAVA.JOBJECT,
    a0    NUMBER,
    a1    NUMBER) IS
BEGIN
    args := JNI.CREATE_ARG_LIST(2);
    JNI.ADD_LONG_ARG(args, a0);
    JNI.ADD_INT_ARG(args, a1);
    JNI.CALL_VOID_METHOD(FALSE, obj, 'demo/get_info', 'wait', '(JI)V', args);
END;
-- Method: equals (Ljava/lang/Object;)Z
FUNCTION equals(
    obj   ORA_JAVA.JOBJECT,
    a0    ORA_JAVA.JOBJECT) RETURN BOOLEAN IS
BEGIN
    args := JNI.CREATE_ARG_LIST(1);
    JNI.ADD_OBJECT_ARG(args, a0, 'java/lang/Object');
    RETURN JNI.CALL_BOOLEAN_METHOD(FALSE, obj, 'demo/get_info', 'equals', '(Ljava/lang/Object;)Z', args);
END;
-- Method: toString ()Ljava/lang/String;
FUNCTION toString(
    obj   ORA_JAVA.JOBJECT) RETURN VARCHAR2 IS
BEGIN
    args := NULL;
    RETURN JNI.CALL_STRING_METHOD(FALSE, obj, 'demo/get_info', 'toString', '()Ljava/lang/String;', args);
END;
-- Method: hashCode ()I
FUNCTION hashCode(
    obj   ORA_JAVA.JOBJECT) RETURN NUMBER IS
BEGIN
    args := NULL;
    RETURN JNI.CALL_INT_METHOD(FALSE, obj, 'demo/get_info', 'hashCode', '()I', args);
END;
-- Method: getClass ()Ljava/lang/Class;
FUNCTION getClass(
    obj   ORA_JAVA.JOBJECT) RETURN ORA_JAVA.JOBJECT IS
BEGIN
    args := NULL;
    RETURN JNI.CALL_OBJECT_METHOD(FALSE, obj, 'demo/get_info', 'getClass', '()Ljava/lang/Class;', args);
END;
-- Method: notify ()V
PROCEDURE notify(
    obj   ORA_JAVA.JOBJECT) IS
BEGIN
    args := NULL;
    JNI.CALL_VOID_METHOD(FALSE, obj, 'demo/get_info', 'notify', '()V', args);
END;
-- Method: notifyAll ()V
PROCEDURE notifyAll(
    obj   ORA_JAVA.JOBJECT) IS
BEGIN
    args := NULL;
    JNI.CALL_VOID_METHOD(FALSE, obj, 'demo/get_info', 'notifyAll', '()V', args);
END;
BEGIN
NULL;
END;
Now i want to call the o/p of Java programe in oracle text item. Please help me. It's very urgent. I am not good in Java.

Sir i use java importer.
PACKAGE BODY get_info IS
-- DO NOT EDIT THIS FILE - it is machine generated!
args   JNI.ARGLIST;
-- Constructor for signature ()V
FUNCTION new RETURN ORA_JAVA.JOBJECT IS
BEGIN
    args := NULL;
    RETURN (JNI.NEW_OBJECT('demo/get_info', '()V', args));
END;
-- Method: main ([Ljava/lang/String;)V
PROCEDURE main(
    a0    ORA_JAVA.JARRAY) IS
BEGIN
    args := JNI.CREATE_ARG_LIST(1);
    JNI.ADD_OBJECT_ARG(args, a0, '[Ljava/lang/String;');
    JNI.CALL_VOID_METHOD(TRUE, NULL, 'demo/get_info', 'main', '([Ljava/lang/String;)V', args);
END;
-- Method: ch_add ()V
PROCEDURE ch_add IS
BEGIN
    args := NULL;
    JNI.CALL_VOID_METHOD(TRUE, NULL, 'demo/get_info', 'ch_add', '()V', args);
END;
-- Method: wait (J)V
PROCEDURE wait(
    obj   ORA_JAVA.JOBJECT,
    a0    NUMBER) IS
BEGIN
    args := JNI.CREATE_ARG_LIST(1);
    JNI.ADD_LONG_ARG(args, a0);
    JNI.CALL_VOID_METHOD(FALSE, obj, 'demo/get_info', 'wait', '(J)V', args);
END;
-- Method: wait ()V
PROCEDURE wait(
    obj   ORA_JAVA.JOBJECT) IS
BEGIN
    args := NULL;
    JNI.CALL_VOID_METHOD(FALSE, obj, 'demo/get_info', 'wait', '()V', args);
END;
-- Method: wait (JI)V
PROCEDURE wait(
    obj   ORA_JAVA.JOBJECT,
    a0    NUMBER,
    a1    NUMBER) IS
BEGIN
    args := JNI.CREATE_ARG_LIST(2);
    JNI.ADD_LONG_ARG(args, a0);
    JNI.ADD_INT_ARG(args, a1);
    JNI.CALL_VOID_METHOD(FALSE, obj, 'demo/get_info', 'wait', '(JI)V', args);
END;
-- Method: equals (Ljava/lang/Object;)Z
FUNCTION equals(
    obj   ORA_JAVA.JOBJECT,
    a0    ORA_JAVA.JOBJECT) RETURN BOOLEAN IS
BEGIN
    args := JNI.CREATE_ARG_LIST(1);
    JNI.ADD_OBJECT_ARG(args, a0, 'java/lang/Object');
    RETURN JNI.CALL_BOOLEAN_METHOD(FALSE, obj, 'demo/get_info', 'equals', '(Ljava/lang/Object;)Z', args);
END;
-- Method: toString ()Ljava/lang/String;
FUNCTION toString(
    obj   ORA_JAVA.JOBJECT) RETURN VARCHAR2 IS
BEGIN
    args := NULL;
    RETURN JNI.CALL_STRING_METHOD(FALSE, obj, 'demo/get_info', 'toString', '()Ljava/lang/String;', args);
END;
-- Method: hashCode ()I
FUNCTION hashCode(
    obj   ORA_JAVA.JOBJECT) RETURN NUMBER IS
BEGIN
    args := NULL;
    RETURN JNI.CALL_INT_METHOD(FALSE, obj, 'demo/get_info', 'hashCode', '()I', args);
END;
-- Method: getClass ()Ljava/lang/Class;
FUNCTION getClass(
    obj   ORA_JAVA.JOBJECT) RETURN ORA_JAVA.JOBJECT IS
BEGIN
    args := NULL;
    RETURN JNI.CALL_OBJECT_METHOD(FALSE, obj, 'demo/get_info', 'getClass', '()Ljava/lang/Class;', args);
END;
-- Method: notify ()V
PROCEDURE notify(
    obj   ORA_JAVA.JOBJECT) IS
BEGIN
    args := NULL;
    JNI.CALL_VOID_METHOD(FALSE, obj, 'demo/get_info', 'notify', '()V', args);
END;
-- Method: notifyAll ()V
PROCEDURE notifyAll(
    obj   ORA_JAVA.JOBJECT) IS
BEGIN
    args := NULL;
    JNI.CALL_VOID_METHOD(FALSE, obj, 'demo/get_info', 'notifyAll', '()V', args);
END;
BEGIN
NULL;
END;
I read both document which is given by you.
Basicaly i don't know how to call java program in form builder.
I wrote this code on When-button-pressed
DECLARE
jo ora_java.jobject;
rv varchar2(1500);
ex ora_java.jobject;
BEGIN
jo := get_info.new;
rv:=get_info.ch_add(jo );
EXCEPTION
WHEN ORA_JAVA.JAVA_ERROR then
message (' Unable to call out to Java, ' ||ORA_JAVA.LAST_ERROR );
message('');
WHEN ORA_JAVA.EXCEPTION_THROWN then
ex := ORA_JAVA.LAST_EXCEPTION;
message(' Unable to call out to Java ' ||Exception_.toString (ex ) );
message(' Unable to call out to Java ' ||Exception_.toString (ex ) );
END;
No error comes and no output comes. I want the client MAC ID. please guide me where i need to change the code.

How to call java program from ABAP

Hi Experts,
My requirement is to call java programs from ABAP. For that i have set up SAP JCO connection by using this link http://www.sdn.sap.com/irj/scn/weblogs?blog=/pub/wlg/739. [original link is broken] [original link is broken] [original link is broken] Connection gets sucessfully. After this how to call java program from ABAP as per our requirement. Please help me out.
Also i tried this way also.. but while executing the DOS Command line appear & disappear in few seconds. So couldnt see the JAVA output. Please help me out to call java programs in ABAP..
DATA:command TYPE string VALUE 'D:Javajdk1.6.0_20 injavac',
parameter TYPE string VALUE 'D:java MyFirstProgram'.
CALL METHOD cl_gui_frontend_services=>execute
EXPORTING
application = command
parameter = parameter
OPERATION = 'OPEN'
EXCEPTIONS
cntl_error = 1
error_no_gui = 2
bad_parameter = 3
file_not_found = 4
path_not_found = 5
file_extension_unknown = 6
error_execute_failed = 7
OTHERS = 8.
Thanks.

This depends on the version of your Netweaver Java AS. If you are running 7.0, you will have to use the Jco framework. The Jco framework is deprecated since 7.1 though. If you want to build a RFC server in 7.1 or higher, it is adviced that you set it up through JRA.
Implement an RFC server in 7.0:
http://help.sap.com/saphelp_nw04/helpdata/en/6a/82343ecc7f892ee10000000a114084/frameset.htm
Implement an RFC server in 7.1 or higher:
http://help.sap.com/saphelp_nwce72/helpdata/en/43/fd063b1f497063e10000000a1553f6/frameset.htm

How to run java program from website?

Hello
I'd like to know how to run java program from my web page.
I'd like to push some button in this web page so java program that would be on my server
would pop-up. Can it be done automaticaly upon running this web site? (without any buttons - I just enter website and program pops up).
Cheers

I rather thought about RMI. But I could try servlets. So how it would look like?.
I would make http request in browser (enter address) and program would show up in its window?. And I would not have to change anything in my program?. This program would run then on both boxes?. One remotely and one not?.
But I would have to learn some basics, I've never worked with servlets. Could you suggest some good sites about it?. With ready examples so I could tweak them to my purpose.
Message was edited by:
macmacmac

How to compile java to exe by JDeveloper?

How to compile java to exe by JDeveloper?

You used to be able to use exegen to generate stand alone executables for Windows, but this no longer works in later versions of Windows. It works for Windows 98 and NT. For example
exegen/main:schedserv /out:sched.exe schedserv.class scheduler.class
will generate the executable sched.exe from the two class files.
Probably MicroSoft decided to make life a bit harder for Java users.

How to run Java program as Daemon Server in linux

How to run Java program as Daemon Server in linux
i would like to run the java program on system start up in a redhat linux system
can any one provide rc.status file

http://wrapper.tanukisoftware.org/

How to do "java Program 50 7" when using Eclipse?

If you use the command-line environment to compile and run a java program called Sample.java instead of using Eclipse, you could compile by writing "java Sample 30 5" or replace the 30 and 5 with other numbers (lets suppose the Sample.java needs 2 int inputs). How would you do the equivalent of that when using Eclipse?
Thanks!

In the Run , there is an arguments tab ..

How to complile java programs?

Hi, everyone
I have a problem.I am working with eclipse and i have never tried to compile a java program with the dos. i think that the steps to do this are:
"I have a project on Desktop in a folder named Tdma.There are some java files in this folder(each for a class) and the Tdma.java has the main method.Then i open a cmd window and i am doing the 2 steps bellow "
1.javac -classpath C:\Documents and Settings\p@ly\Desctop\Tdma Tdma.java
2.java Tdma
But in the 1st step i get this output: ' javac is not recognised as an internal or external command...'
Can anyone help me?
thanx

you need to set your path variable so the windows knows where to find javac.exe Here is where you can read how to do it
http://java.sun.com/docs/books/tutorial/getStarted/problems/index.html

Exception when running a compiled java program in DOS

I'm new to programming in general and java in specific. I am using the jGrasp programming software, and successfully compile my program, but when I try to run it out of DOS (which I undesrtand is the purpose of java to begin with, unless I'm mistaken), I get an exception that looks exactly like this.....
Exception in thread "main" java.lang.NoClassDefFoundError: keyboard/java
Caused by: java.lang.ClassNotFoundException: keyboard.java
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
I realize I may just be missing something simple, as I've not been in the class for very long, but the book doesn't seem to have the answer. It is "Starting out with Java: Early Objects, Third Edition, by Tony Gaddis. Any help will be apprecieated. The program is below, it's really short.
The program is a simple one to teach myself scanner input and an 'if' statement:
*     basic input program
import java.util.Scanner;
public class keyboard
     public static void main(String[] args)
          String Class;
          int age;
          String race;
          char sex;
          String gender;
          Scanner keyboard = new Scanner(System.in);
          System.out.print("What class do you wish to be? ");
          Class = keyboard.nextLine();
          System.out.print("How old is your character? ");
          age = keyboard.nextInt();
          keyboard.nextLine();
          System.out.print("What sex is your character? M/F? ");
          gender = keyboard.nextLine();
          sex = gender.charAt(0);
          System.out.print("What race is your character? ");
          race = keyboard.nextLine();
          if (sex == 'M')
               System.out.println("Today you will be playing a " + race + " " + Class +
                                                       " who is " + age + " years old at the start " +
                                                       "of his adventuring career!");
          if (sex == 'F')
               System.out.println("Today you will be playing a " + race + " " + Class +
                                                       " who is " + age + " years old at the start " +
                                                       "of her adventuring career!");
}

Childofheinlein wrote:
I'm new to programming in general and java in specific. I am using the jGrasp programming software, and successfully compile my program, but when I try to run it out of DOS (which I undesrtand is the purpose of java to begin with, unless I'm mistaken), I get an exception that looks exactly like this.....
So summerizing some of what was said before and some of that wasn't.
jGrasp is a simplistic IDE. When you pop a dos window from it it sets up the windows correctly to run your program. When you open a regular command window you must do the same yourself.
>
Exception in thread "main" java.lang.NoClassDefFoundError: keyboard/javaJava runs "classes". The command that you typed above meant that you were trying to run a "file". Specifically the file "keyboard.java". The two are not the same. There is however a relationship. When the source code, in this case inside of "keyboard.java" is compiled it produces a file called "keyboard.class". Insided of the file there is a "class" called "keyboard". Notice that the name of the class does not have either .java nor .class on the end of it.
The VM (the 'java' command) finds a "class" using the class path to search files of various types for the class (again keep in mind that files contain classes but they are not themselves classes.)
You can add to the classpath using the Sun VM using either command line options or environment variables. As noted in some of the previous messages those are "-cp" and "CLASSPATH". It is important to note that that does NOT fully specify the class path. But for your purposes it is sufficient to think of it as doing so.
The 'default' setting for the part of the class path that you normally set (like via '-cp') is the current directory which is specified by the ".". So normally the following are equivalent.
java -cp . keyboard
java keyboard
The reason the VM could not find your class when you opened the dos window yourself is because you were in the wrong directory. If you had been in the directory with the file "keyboard.class" then it would have worked (if you have not messed with the environment variable "CLASSPATH".)
So if your class file has the following location: c:\myapps\java\keyboard.class then you can do the following.
1. Open a console window
2. Type "cd c:\myapps\java"
3. Type "java keyboard"
If the above does not work then you are in the wrong directory or the env variable CLASSPATH has been set to something.

How to compile Java files using Ant in Eclipse

Hi All ,
I would like to compile all Java files using Ant in Eclipse.Since am very new to Ant and Eclipse can someone help me to create a build.xml file and let me know how to compile all the java files.
For ex , I have placed my java files inside the path C:\HEC\Terab.Initially the Terab folder holds 7 jar files which i had decompiled using JD compiler and placed the unzipped 7 folders (which contains the java files ).Now i have imported the HEC project into Eclipse using New ->Project ->Java Project.after importig it throwed me an error saying missing jar files.again i copied the jar files and placed inside Terab folder with other 7 folder.
Now How i can compile the java files and convert in to class files.Then after compiling the files i will again need to jar all the 7 folder.
Please tell me the steps i need to follow.How to write an build.xml file ? where i should keep it ? only one build.xml file is enough or should i write 7 build.xml file for each folder ? Please help me out...
Thanks & Regards
Kar1983

put it another way, what I am trying to do is to compile David Brackeen's ch 18 code from his book. The java sourse files can be downloaded here:
http://www.brackeen.com/javagamebook/
my question is that how would I complie all of these file so that I can get the program in ch18src\src\com\brackeen\javagamebook\test\ to run?

How to compile java programs? There is no javac for me!

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