Starting exetutable java file from java code

Hi I was wondering how I can start a executable java file from java code?
thanks

Hi Mkaveli,
Yes, it's possible. If you have a JAR executable, you've just to call the main method of its starter class. For a simple executable class, just call its main method.
This way :
SomeStarter.main(null); // if there's no argumentSmall precision : the executable JAR or class must be specified in the classpath of your application.

Similar Messages

How to pass arguments to a batch file from java code

Hi
I have a batch file (marcxml.bat) which has the following excerpt :
@echo off
if x==%1x goto howto
java -cp C:\Downloads\Marcxml\marc4j.jar; C:\Downloads\Marcxml\marcxml.jar; %1 %2 %3
goto end
I'm calling this batch file from a java code with the following line of code:
Process p = Runtime.getRuntime().exec("cmd /c start C:/Downloads/Marcxml/marcxml.bat");
so ,that invokes the batch file.Till that point its ok.
since the batch file accpets arguments(%1 %2 %3) how do i pass those arguments to the batch file from my code ...???
%1 is a classname : for ex: gov.loc.marcxml.MARC21slim2MARC
%2 is the name of the input file for ex : C:/Downloads/Marcxml/source.xml
%3 is the name of the output file for ex: C:/Downloads/Marcxml/target.mrc
could someone help me...
if i include these parameters too along with the above line of code i.e
Process p = Runtime.getRuntime().exec("cmd /c start C:/Downloads/Marcxml/marcxml.bat gov.loc.marcxml.MARC21slim2MARC C:\\Downloads\\Marcxml\\source.xml C:\\Downloads\\Marcxml\\target.mrc") ;
I get the following error :
Exception in thread main java.lang.Noclassdef foundError: c:Downloads\marcxml\source/xml
could some one tell me if i'm doing the right way in passing the arguments to the batch file if not what is the right way??
Message was edited by:
justunme1

1 - create a java class (Executer.java) for example:
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
public class Executer {
     public static void main(String[] args) {
          try {
               for (int i = 0; i < args.length; i++) {
                    System.out.println(args);
               Class<?> c = Class.forName(args[0]);
               Class[] argTypes = new Class[] { String[].class };
               Method main = c.getDeclaredMethod("main", argTypes);
               // String[] mainArgs = Arrays.copyOfRange(args, 1, args.length); //JDK 6
               //jdk <6
               String[] mainArgs = new String[args.length - 1];
               for (int i = 0; i < mainArgs.length; i++) {
                    mainArgs[i] = args[i + 1];
               main.invoke(null, (Object) mainArgs);
               // production code should handle these exceptions more gracefully
          } catch (ClassNotFoundException x) {
               x.printStackTrace();
          } catch (NoSuchMethodException x) {
               x.printStackTrace();
          } catch (IllegalAccessException x) {
               x.printStackTrace();
          } catch (InvocationTargetException x) {
               x.printStackTrace();
          } catch (Exception e) {
               e.printStackTrace();
2 - create a .bat file:
@echo off
java -cp C:\Downloads\Marcxml\marc4j.jar; C:\Downloads\Marcxml\marcxml.jar; Executer %TARGET_CLASS% %IN_FILE% %OUT_FILE%3 - use set command to pass variable:
Open MS-DOS, and type the following:
set TARGET_CLASS=MyTargetClass
set IN_FILE=in.txt
set OUT_FILE=out.txt
Then run your .bat file (in the same ms dos window)
Hope that Helps

How can we change the time of the media file from java code ?

Hi,
particularly, how can we start the media file from the second 55 and not from the second 0 (beginning) ?
Thanks.

I tryed to use such method but an exception was raised:
javax.media.NotRealizedError: Cannot set media time on a unrealized controller
     at com.sun.media.BasicPlayer.setMediaTime(BasicPlayer.java:427)
     at com.sabily.mualim.main.MediaFileDemo.loadMediaFile(MediaFileDemo.java:72)
     at com.sabily.mualim.main.MediaFileDemo.<init>(MediaFileDemo.java:77)
     at com.sabily.mualim.main.MualimStandalone.main(MualimStandalone.java:12)
Exception in thread "main" javax.media.NotRealizedError: Cannot set media time on a unrealized controller
     at com.sun.media.BasicPlayer.setMediaTime(BasicPlayer.java:427)
     at com.sabily.mualim.main.MediaFileDemo.loadMediaFile(MediaFileDemo.java:72)
     at com.sabily.mualim.main.MediaFileDemo.<init>(MediaFileDemo.java:77)
     at com.sabily.mualim.main.MualimStandalone.main(MualimStandalone.java:12)
below is the code related to playing media file:
package com.sabily.mualim.main;
import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Container;
import java.awt.Panel;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import javax.media.ControllerAdapter;
import javax.media.ControllerListener;
import javax.media.Manager;
import javax.media.NoPlayerException;
import javax.media.Player;
import javax.media.RealizeCompleteEvent;
import javax.media.Time;
import javax.media.TimeBase;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class MediaFileDemo extends JFrame{
     private Player player;
     Component center;
     Component south;
     private void loadMediaFile() {
          final Container contentPane = getContentPane();
          if (player != null) {
               player.stop();
          try {
//               player = Manager.createPlayer(new URL("file:C:/Nouveau dossier/e1_intro.wav"));
               player = Manager.createPlayer(new URL("file:C:/mp3/001.wav"));
               //player = Manager.createPlayer(new URL("file:D:/Film/Earth_Planet/Planet.Earth.EP08.Jungles/Planet.Earth.EP08.Jungles.avi"));
          } catch (NoPlayerException e) {
               e.printStackTrace();
          } catch (MalformedURLException e) {
               e.printStackTrace();
          } catch (IOException e) {
               e.printStackTrace();
          ControllerListener listener = new ControllerAdapter() {
               public void realizeComplete(RealizeCompleteEvent event) {
                    Component vc = player.getVisualComponent();
                    if (vc != null) {
                         contentPane.add(vc, BorderLayout.CENTER);
                         center = vc;
                    } else {
                         if (center != null) {
                              contentPane.remove(center);
                              contentPane.validate();
                    Component cpc = player.getControlPanelComponent();
                    if (cpc != null) {
                         contentPane.add(cpc, BorderLayout.SOUTH);
                         south = cpc;
                    } else {
                         if (south != null) {
                              contentPane.remove(south);
                              contentPane.validate();
                    pack();
                    //setTitle("Lesson 1");
          player.addControllerListener(listener);
          player.setMediaTime(new Time(15));
          player.start();
     public MediaFileDemo() {
          loadMediaFile();
     public Player getPlayer() {
          return player;
     public void setPlayer(Player player) {
          this.player = player;
Best Regards

Running a jar file from java code

Hi!
Im trying to run a jar file from my code.
I've tried Classloader, but that doesnt work because it doesnt find the images (also embedded in the 2nd jar file).
WHat I would like to do is actually RUN the 2nd jar file from the first jar file. There must be a way to do this right?
any ideas?

ok, I found some wonderful code (see below) that will try to start the jar. But it doesn't. What it does is produce the following error when my application runs...
So it's not finding the images in the jar file that I am trying to run? Strange. I checked the URL that sending, but it seems ok....
I think I will check the url again to make sure......
any ideas?
Uncaught error fetching image:
java.lang.NullPointerException
     at sun.awt.image.URLImageSource.getConnection(Unknown Source)
     at sun.awt.image.URLImageSource.getDecoder(Unknown Source)
     at sun.awt.image.InputStreamImageSource.doFetch(Unknown Source)
     at sun.awt.image.ImageFetcher.fetchloop(Unknown Source)
     at sun.awt.image.ImageFetcher.run(Unknown Source)
the code....
/* From http://java.sun.com/docs/books/tutorial/index.html */
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.net.JarURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.jar.Attributes;
* Runs a jar application from any url. Usage is 'java JarRunner url [args..]'
* where url is the url of the jar file and args is optional arguments to be
* passed to the application's main method.
public class JarRunner {
public static void main(String[] args) {
    URL url = null;
    try {
      url = new URL(args[0]);//"VideoTagger.jar");
    } catch (MalformedURLException e) {
      System.out.println("Invalid URL: ");
    // Create the class loader for the application jar file
    JarClassLoader cl = new JarClassLoader(url);
    // Get the application's main class name
    String name = null;
    try {
      name = cl.getMainClassName();
    } catch (IOException e) {
      System.err.println("I/O error while loading JAR file:");
      e.printStackTrace();
      System.exit(1);
    if (name == null) {
      fatal("Specified jar file does not contain a 'Main-Class'"
          + " manifest attribute");
    // Get arguments for the application
    String[] newArgs = new String[args.length - 1];
    System.arraycopy(args, 1, newArgs, 0, newArgs.length);
    // Invoke application's main class
    try {
      cl.invokeClass(name, newArgs);
    } catch (ClassNotFoundException e) {
      fatal("Class not found: " + name);
    } catch (NoSuchMethodException e) {
      fatal("Class does not define a 'main' method: " + name);
    } catch (InvocationTargetException e) {
      e.getTargetException().printStackTrace();
      System.exit(1);
private static void fatal(String s) {
    System.err.println(s);
    System.exit(1);
* A class loader for loading jar files, both local and remote.
class JarClassLoader extends URLClassLoader {
private URL url;
   * Creates a new JarClassLoader for the specified url.
   * @param url
   *            the url of the jar file
public JarClassLoader(URL url) {
    super(new URL[] { url });
    this.url = url;
   * Returns the name of the jar file main class, or null if no "Main-Class"
   * manifest attributes was defined.
public String getMainClassName() throws IOException {
    URL u = new URL("jar", "", url + "!/");
    JarURLConnection uc = (JarURLConnection) u.openConnection();
    Attributes attr = uc.getMainAttributes();
    return attr != null ? attr.getValue(Attributes.Name.MAIN_CLASS) : null;
   * Invokes the application in this jar file given the name of the main class
   * and an array of arguments. The class must define a static method "main"
   * which takes an array of String arguemtns and is of return type "void".
   * @param name
   *            the name of the main class
   * @param args
   *            the arguments for the application
   * @exception ClassNotFoundException
   *                if the specified class could not be found
   * @exception NoSuchMethodException
   *                if the specified class does not contain a "main" method
   * @exception InvocationTargetException
   *                if the application raised an exception
public void invokeClass(String name, String[] args)
      throws ClassNotFoundException, NoSuchMethodException,
      InvocationTargetException {
    Class c = loadClass(name);
    Method m = c.getMethod("main", new Class[] { args.getClass() });
    m.setAccessible(true);
    int mods = m.getModifiers();
    if (m.getReturnType() != void.class || !Modifier.isStatic(mods)
        || !Modifier.isPublic(mods)) {
      throw new NoSuchMethodException("main");
    try {
      m.invoke(null, new Object[] { args });
    } catch (IllegalAccessException e) {
      // This should not happen, as we have disabled access checks
}

Generation of xml file from java code

hi,
I want to manipulate data in a xml file with java code.I have read data from xml file and also changed it. But i am unable to covert it again in xml file from java code. Can you please tell me how i can do this?

Let me know which parser are you using currently for reading xml files so that i assist you. For now, you can refer to STAX Parser API under this link
http://java.sun.com/webservices/docs/1.6/tutorial/doc/SJSXP3.html

How to call a .bat file from java code?

How to call a .bat file from java code? and how can i pass parameters to that .bat file?
Thanks in advance

thanks for ur reply
but still i am getting the same error.
I am trying to run a .bat file of together tool, my code looks like below
import java.lang.Runtime;
import java.lang.Process;
import java.io.File;
class SysCall{
     public static void main(String args[]){
          String cmd="D://Borland//Together6.2//bin//Together.bat -script:com.togethersoft.modules.qa.QA -metrics out:D://MySamples//Metrics// -fmt:html D://Borland//Together6.2//samples//java//CashSales//CashSales.tpr";
          //String path="D://Borland//Together6.2//bin//Together.bat ";
          Runtime r= Runtime.getRuntime(); //Declare the system call
          try{
               System.out.println("Before batch is called");
               Process p=r.exec(cmd);
               System.out.println(" Exit value =" + p.exitValue());
               System.out.println("After batch is called");
          /*can produce errors which must be caught*/
          catch(Exception e) {
               e.printStackTrace();
               System.out.println (e.toString());
I am getting the below exception
Before batch is called
java.lang.IllegalThreadStateException: process has not exited
at java.lang.Win32Process.exitValue(Native Method)
at SysCall.main(SysCall.java:17)
java.lang.IllegalThreadStateException: process has not exited

How to modify an existing xml file from java code.

Hi
I have worked on creating a new xml file from java code using xmlbeans.But if i try to modify an already existing file using java code I am unable to get errorfree xmlfile.
For example if xml file(studlist.xml) is as below:
<?xml version="1.0" encoding="UTF-8"?>
<StudentList xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="D:\kchaitanya\xmlprac1\abc\Studlist.xsd">
     <Student>
          <Name>ram</Name>
          <Age>27</Age>
     </Student>
<Student>
          <Name>sham</Name>
          <Age>26</Age>
     </Student>
</StudentList>
Now suppose i have set name to victor using student.setName,
and set age to 20 using setAge from javacode,
the new xml file is as follows:
<?xml version="1.0" encoding="UTF-8"?>
<StudentList xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="D:\kchaitanya\xmlprac1\abc\Studlist.xsd">
     <Student>
          <Name>ram</Name>
          <Age>27</Age>
     </Student>
<Student>
          <Name>sham</Name>
          <Age>26</Age>
     </Student>
</StudentList>
<Student>
          <Name>victor</Name>
          <Age>20</Age>
     </Student>
As observed this is not a valid xml file.But how can i modify without any errors?

I know it's an old post, but I found this while doing a google search for something else, and don't like to leave it un-aswered
Just in case anyone has a similar problem... In this case the new elements have been appended outside of the root element
What you need to do is first get the root element and then append the new children to that, there are several ways of getting the root element, which depend on what you want to do with the elements you get back here's a simple (incomplete) way.
// gets the root element of the specified file (code not shown)
Element rootElement= new SAXReader().read(file).getRootElement();Then just append the new elements as below (this is non-generic code and would need to be modified for your situation)
// write a new student element
Element student = document.createElement("Student"); // creates the new student
rootElement.appendChild(student); // ***appends it to the root element***
Element name = document.createElement("Name"); // creates the name element
name.appendChild(document.createTextNode("Fred")); // adds the name text to the name element
student.appendChild(name); // appends the name to the student
Element age= document.createElement("Age"); // creates the age element
age.appendChild(document.createTextNode("26")); // adds the age text to the age element
student.appendChild(age); // appends the name to the studentThen flush ya buffers or whatever and write the file
Edited by: Dream-Scourge on Apr 23, 2008 11:10 AM

Call .bat file from java code

I need to call an application that uses a .bat file to execute from a java program. Is that possible?
This is the .bat file:
importcli.exe ciaf2735 C:\Importcli\files\SAI2735*.txt
importcli.exe ciaf2735 C:\Importcli\files\CI2735*.txt
importcli.exe ciaf2735 C:\Importcli\files\SC2735*.txt
importcli.exe db1800 C:\Importcli\files\*.mdb

magaupe wrote:
I need to call an application that uses a .bat file to execute from a java program. Is that possible?
This is the .bat file:
importcli.exe ciaf2735 C:\Importcli\files\SAI2735*.txt
importcli.exe ciaf2735 C:\Importcli\files\CI2735*.txt
importcli.exe ciaf2735 C:\Importcli\files\SC2735*.txt
importcli.exe db1800 C:\Importcli\files\*.mdb
Hmmm, I wonder what would happen if there were a web search engine and you could research like this:
[http://www.google.com/search?hl=en&q=call+.bat+file+from+java]

Open a java file from c#

Does anyone know if it's possible to open a java file from a c# web form?
Any links would also be appreciated,
Thanks,
Clivert

I don't know anything about C# web forms (that's pretty far away from the topic of this forum) but I expect anybody answering the question would need to know what you mean by "open" and "a java file" in that context.
For example it might mean to cause a text editor to run and display the source code for a Java class. Or it might mean for a Java JVM to start running and execute the main method of a Java class.

Executing batch file from Java stored procedure hang

Dears,
I'm using the following code to execute batch file from Java Stored procedure, which is working fine from Java IDE JDeveloper 10.1.3.4.
public static String runFile(String drive)
String result = "";
String content = "echo off\n" + "vol " + drive + ": | find /i \"Serial Number is\"";
try {
File directory = new File(drive + ":");
File file = File.createTempFile("bb1", ".bat", directory);
file.deleteOnExit();
FileWriter fw = new java.io.FileWriter(file);
fw.write(content);
fw.close();
// The next line is the command causing the problem
Process p = Runtime.getRuntime().exec("cmd.exe /c " + file.getPath());
BufferedReader input = new BufferedReader(new InputStreamReader(p.getInputStream()));
String line;
while ((line = input.readLine()) != null)
result += line;
input.close();
file.delete();
result = result.substring( result.lastIndexOf( ' ' )).trim();
} catch (Exception e) {
e.printStackTrace();
result = e.getClass().getName() + " : " + e.getMessage();
return result;
The above code is used in getting the volume of a drive on windows, something like "80EC-C230"
I gave the SYSTEM schema the required privilege to execute the code.
EXEC DBMS_JAVA.grant_permission('SYSTEM', 'java.io.FilePermission', '<<ALL FILES>>', 'read ,write, execute, delete');
EXEC DBMS_JAVA.grant_permission('SYSTEM', 'SYS:java.lang.RuntimePermission', 'writeFileDescriptor', '');
EXEC DBMS_JAVA.grant_permission('SYSTEM', 'SYS:java.lang.RuntimePermission', 'readFileDescriptor', '');
GRANT JAVAUSERPRIV TO SYSTEM;
I have used the following to load the class in Oracle 9ir2 DB:
loadjava -u [system/******@orcl|mailto:system/******@orcl] -v -resolve C:\Server\src\net\dev\Util.java
CREATE FUNCTION A1(drive IN VARCHAR2) RETURN VARCHAR2 AS LANGUAGE JAVA NAME 'net.dev.Util.a1(java.lang.String) return java.lang.String';
variable serial1 varchar2(1000);
call A1( 'C' ) into :serial1;
The problem that it hangs when I execute the call to the function (I have indicated the line causing the problem in a comment in the code).
I have seen similar problems on other forums, but no solution posted
[http://oracle.ittoolbox.com/groups/technical-functional/oracle-jdeveloper-l/run-an-exe-file-using-oracle-database-trigger-1567662]
I have posted this in JDeveloper forum ([t-853821]) but suggested to post for forum in DB.
Can anyne help?

Dear Peter,
You are totally right, I got this as mistake copy paste. I'm just having a Java utility for running external files outside Oracle DB, this is the method runFile()
I'm passing it the content of script and names of file to be created on the fly and executed then deleted, sorry for the mistake in creating caller function.
The main point, how I claim that the line in code where creating external process is the problem. I have tried the code with commenting this line and it was working ok, I made this to make sure of the permission required that I need to give to the schema passing security permission problems.
The function script is running perfect if I'm executing vbs script outside Oracle using something like "cscript //NoLogo aaa1.vbs", but when I use the command line the call just never returns to me "cmd.exe /c bb1.bat".
where content of bb1.bat as follows:
echo off
vol C: | find /i "Serial Number is"
The above batch file just get the serial number of hard drive assigned when windows formatted HD.
Same code runs outside Oracle just fine, but inside Oracle doesn't return if I exectued the following:
variable serial1 varchar2(1000);
call A1( 'C' ) into :serial1;
Never returns
Thanks for tracing teh issue to that details ;) hope you coul help.

How to edit the existing data in the XML file from java programming.

Hi all
i am able to create XML file with the sample data as below from java programming.
i need sample code on how to edit the existing data in the XML file?
for example
<?xml version="1.0"?>
   <mydata>
           <data1>
                     <key1>467</key1>
                    <name1>Paul</name1>
                    <id1>123</id1>
          </data1>
          <data2>
                     <key2>467</key2>
                    <name2>Paul</name2>
                    <id2>123</id2>
          </data2>
    </mydata>
i am able to insert the data in the XML.
now i need sample code on how to modify the data in the above XML file from the java programming for only key2,name2,id2 tags only. the remaining tags data in the XML file i want to keep same data except for key2,name2,id2 which are i want to modify from java code
Regards
Sunil
[points will be always rewardable]

hi
u need a parser or validate the xml file for to read the xml file from java coding u need for this
xml4j.jar u can download this file from here
http://www.alphaworks.ibm.com/tech/xml4j
or we can use the SAX(simple API for XML)
some sample applications for this
http://www.java-tips.org/java-se-tips/javax.xml.parsers/how-to-read-xml-file-in-java.html
http://www.developertutorials.com/tutorials/java/read-xml-file-in-java-050611/page1.html
http://www.xml-training-guide.com/e-xml44.html
let me know u need any other info
bvr

Trying to compile a .java file from another .java file

Hello,
I'm trying to compile a .java file from another .java file using Runtime.exec...
String c[]=new String[3];
c[0]="cmd.exe"; c[1]="/c" ; c[2]="javac Hello.java";
Process p=Runtime.exec(c);
If anyone can help me in atleast getting the command prompt when Runtime.exec("cmd.exe") is executed...that would be great...I tried out notepad.exe, calc, explorer instead of cmd.exe...all the commands display their respective windows..except cmd.exe...the command prompt doesnt appear...
Please help me ASAP....
Thanks for your help in advance...
Regards.
AKhila.

try this. ur code will be compliled and will get .class file. but console won't appear. is it a must for u?
public class Exec{
     public static void main(String a[]) throws Exception{
          String c[]=new String[3];
          c[0]="cmd.exe"; c[1]="/c" ; c[2]="javac Hello.java";
          Process p=Runtime.getRuntime().exec(c);
          // or Runtime.getRuntime().exec("javac Hello.java");

Calling a created Java file from an AIR application

I've got a guy helping me out who is creating a Java file that outputs an F1 keypress to the operating system/desktop (which Flex alone can't do.
My problem is I need to know how I can call/activate this file from within an AIR application. I want my app to be ready for when he has created it for me but I've never used Flex to call an application so I would not know what classes need to be called or if any script would be required.
In the following simple code lets say if the Java file itself was called keypress.java (or whatever file extension a java file has) what code would need to be added in, including imported classes, to make the click of the button activate this java file?
<?xml version="1.0" encoding="utf-8"?>
<mx:WindowedApplication xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">
<mx:Button id="KeypressButton" label="Button" horizontalCenter="0" verticalCenter="0" click=""/>
</mx:WindowedApplication>

I think one solution is to use a Java proxy to call the Web services.
In the Java proxy you can have a method that accepts the user/pass and sets them correctly for the Web service.
Then you expose that Java proxy as a data control (right click, create data control) - and then create a page that invokes that method.
(For the basics of working with a POJO data control see: http://blogs.oracle.com/shay/2009/07/java_class_data_control_and_ad.html )

Java files from a EAR file and from inner (inside EAR)

I want to read all Java files from a EAR file and from inner (inside EAR) EAR or WAR file with out unpacking.
suppose "Demo.ear" contaions the following files:
abc.java
programs / a.java
programs / b.java
src / index.java
src / com / myFolder / main.java
src.war
and suppose "src.war" again contains some java files inside differenet folders.
The main problem is that i can read all java files from "Demo.ear" but unable to reading from "src.war" b'coz my program is using JarFile class constructor which needs a archive file path, So only top level archive having the path but not the inner archives.
So, pls help me out to this problems
Thanks in advance

Firstly Sorry to writing long letter. but i was unable to express my problem.
see my code==============================
JarFile jarFile = new JarFile("Demo.ear");
Enumeration e=jarFile.entries();
while (e.hasMoreElements())
JarEntry entry=(JarEntry)e.nextElement();
if (entry.getName().endsWith(".war"))
// Then what Next to do...........
===========================================
you have mentioned "theFile" , What is this?...............
InputStream in = theFile.getInputStream(theEntryOfTheWAR);
This line is not a compatible type casting in Java..........
ZipOutputStream theWar = new ZipInputStream(in);

How do you run another Java file from a master Java file?

We're making a game in Java at school, and we need to know how we can run a Java file from another one - like inside the master Java file, we need to have a command to run game.java (something like that). Thanks!

We're making a game in Java at school, and we need to know how we can run a Java file from another one - like inside the master Java file, we need to have a command to run game.java (something like that). Thanks!One doesn't "run a Java file", and there's no conventional definition of "master Java file". If you want to call the main() method of another class, just make sure the class is in your classpath and call the method. If you want to start up a separate JVM with that class as a process, use Runtime.exec() or similar method.
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Starting exetutable java file from java code

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