JNI calls to other classes

hey Folks.
Is there any way for me to make callbacks into Java to a class other then the one I invoked my native methods from?
I know how to make callbacks to the class I connected to my DLL from, but I'm looking for a way to access other classes that I have instantiated,
Thanks for the help,
Richard

I would suggest you to use a callback interface, stating the standard call back functions.
Write a small interface yourself.
The objects you wish to call back on should have "the methods" u want to call back.
Either u can decide on a call back function name as u wish to, or by implementing an interface.
In the native method you want to callback to a java object, in the signature, pass a ref to object of this type.
say interface is ICallBack;
native void myAsynchNativeMethod(ICallBack theCallBack, arg1, arg2.. );
or else
native void myAsynchNativeMethod(Object theCallBack, arg1, arg2.. );
the third argument in the native functions native code should be the ref to the object on which u will invoke the call back.
cheers

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ProgressMonitor in thred, call from other class

Hi all
I have a problem using the ProgressMonitor... I just want to update the progress from another class.
So what i was thinking was:
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I have tried searching alot on these forums, and on google, but all methods implementing progressmonitor uses a call from within the class. <- Not what I want. :=)
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.beans.*;
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Thx for the reply, I now have a working Progressmonitor which i easily can control
import java.awt.Toolkit;
import javax.swing.ProgressMonitor;
* Use of a ProgressMonitor. This class implements an easy to use progressmonitor for use in other classes.
* @author     Nick Andersen
* @created    4. marts 2008
* @version    1.00
public class ProgressMonitorSetup {
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     private int progress;
     private int max;
     private String note;
     private String complete;
     private String cancel;
     private String completeTotal;
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     public ProgressMonitorSetup() {
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          max = 100;
          complete = "Fremgang: ";
          cancel = "Job afbrudt.";
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Calling a object of class from other class's function with in a package

Hello Sir,
I have a package.package have two classes.I want to use object of one class in function of another class of this same package.
Like that:
one.java
package co;
public class one
private String aa="Vijay"; //something like
}main.java:
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import java.util.Stack;
public class main extends Stack
public void show(one obj)
push(obj);
public static void main(String args[])
main oo=new main();
}when I compile main class, Its not compile.
Its give error.can not resolve symbol:
symbol: class one
location: class co.main
public void show(one obj)
^Please help How that compile "Calling a object of class from other class's function with in a package" beacuse I want to use this funda in an application

kumar.vijaydahiya wrote:
.It is set in environment variable.path=C:\bea\jdk141_02\bin;.,C:\oraclexe\app\oracle\product\10.2.0\server\bin;. command is:
c:\Core\co\javac one.javaIts compiled already.
c:\Core\co\javac main.javaBut it give error.
Both java classes in co package.Okay, open a command prompt and execute these two commands:
// to compile both classes:
javac -cp c:\Core c:\Core\co\*.java
// to run your main-class:
java -cp c:\Core co.main

Calling repaint from other Class file.

Hi,
First of all i am pretty new to Java so I hope you understand what I am trying to explain..
I am trying to create an applet which draws some polygons on the screen. For the drawing of these polygons I have created another class which is located in another package but the same project. I plan to use this second package as some kind of library so that i can simple call 2 or 3 functions in future applets to draw these polygons (which always have the same shape). In the library file i have created a contructor, a draw function and some other functions to change some properties. I also created a function that created a popup window as soon as i click on one of the polygons i have created. In the popup some buttons are available which change the color of the polygon. All this works fine, but the problem i have is the following:
When i click a button the main class (in package 1) needs to be repainted for the changes to be visable. But the main class can always be a different one. Is it possible to check in the class in the library package, which class from the main package called the class, and execute a repaint() on that class. So i have the following situation:
Package 1 (Applets):
package applets;
class myApplet extends Applet implements .... {
private Tank tank1 = new Tank(20, 20, 100, 200);
private Tank tank2 = new Tank(250, 20, 100, 200);
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tank1.drawTank(g);
tank2.drawTank(g);
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tank1.openWindow();
tank2.openWindow();
Package 2 (Library):
package applets.library;
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public class myWindow extends Frame {
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show();
public boolean action(Event e, Object arg) {
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So what i want to do is: In class Tank in the public class myWindow in the method action, i want to call the repaint() of the class myApplet
I hope my problem is clear to you, as you may have noticed i have a little trouble explaining it clearly..

First of all thanks a lot for your reply and sorry for my way of programming. Like i said i am pretty new to Java, i am actually only programming for about 2 weeks and trying to learn from some examples on the internet.
I dont really understand what you want me to do, is it maybe possible to give a little bit of sample code? That would help me a lot.
Maybe some background information about the project will help a bit too.
I work at a company that develops automation solutions. We program PLC's and SCADA systems. Now Siemens has some PLC's that support Java applets which make it possible to visualize industrial processes. Now i am trying to figure out if it is possible to start developing own java applets for visualisation in the future. Since most programmers here have no experience in any higher programming language i want to keep it as simple as possible, by developing libraries that do the most of the programming work for them.
Now i want to create the first part of this library by programming some kind of storage tank. This tank always has a valve. when i click on the valve a popup should open with the operation button to open of close that valve. When a valve is opened it should be colored green and when its closed it should be colored gray or something. The Tank class has a couple of methods:
drawTank(); to draw the tank in my applet,
openValve(); to open the Valve,
closeValve(); to close the Valve,
After all this is created i want to be able to use this class in all my other classes and create a tank by simple making a new Tank object, draw it on my applet using the drawTank() method and open or close the Valve using the other 2 methods, however when i open or close the Valve the color of the valve should change so i must be able to call the repaint of all the classes that use my Tank class, but i want to do that INSIDE my Tank class.
If there is another way of doing this i would love to hear so, but i would help me a lot if you can explain in a little bit of sample code. It doesn't have to be really long or detailed.
Thnx in advance

Calling methods from other classes

I have a bunch of little java files in a folder, do I need to make a package in order to access all the methods in all the classes, or can I just make an instance of any of the methods because all the classes are in the same folder?

HI,
If your methods have a "public" modifier (and the class does too) then you can instantiate your classes as objects from that (so-called) "default" package in any other class or object in any other package and then call the methods on those instantiated objects as you please.
If that sounds confusing... I'd seriously try the excellent tutorials at this site, especially "the java tutorial".
/k1

Calling a variable from main class to other class

How do I call a variable that is initialize in the Test.java into Sub.java?
I want to call the a, b, c that I have initialize in Test.java into Sub.java.
import java.util.*;
import java.lang.*;
import java.awt.*;
public class Test{
     public static void main(String args[]){
          int b;
          int c=1;
          int a=11;
          b = c + a;
          System.out.println(+b);
import java.util.*;
import java.lang.*;
import java.awt.*;
public class Sub{
     public void Subtraction(){
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               b = a-c;
          else if(c>a)
               b = c-a;
          else if(a=c)
               b = a-c;
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}

This is, and I'm sorry but I don't know how else to say this, a real big mess.
I'll go through some (most/all) of it but honestly....
import java.awt.*;Many will tell you that you should use specific imports and not wildcards to increase ease of reading. I am not so personally picky about this but it would help you.
import java.awt.event.*;
import javax.swing.*;
import java.util.*; Don't import things you never use. It just adds confusion get rid of java.util import
import java.lang.Object.*;Redundant. Remove it.
import java.applet.Applet.*;Unused. get rid of it
public class SUBOK {      Terrible class name. Please use the standard [_Java naming conventions_|http://java.sun.com/docs/codeconv/html/CodeConventions.doc8.html]
public int a = 10;
    public static void main(String[] args) {
         SUBOK runGUI = new SUBOK();
    public SUBOK(){
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         f.setSize(150,100);
         f.setVisible(true);
         f.setDefaultCloseOperation(f.EXIT_ON_CLOSE);
         JButton b = new JButton("Sum");
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         b.addActionListener(new Push());
         JPanel p = new JPanel();
         p.add(b);
         f.add(p);
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private class Push implements ActionListener{
         public void actionPerformed(ActionEvent e){
              if(e.getActionCommand().equals("send")){
                   int a = 12;You are aware that this a has nothing to do with your other a? right? I mean this is a method local variable in a whole other class then the other one.
                       Add i = new Add();
                       i.Add();
    public int aValue(){
         return a;
} Alrighty then...
import java.lang.*;Redundant. Remove You never need to import java.lang.
import java.awt.*;Unused. remove.
import java.util.*;Unused remove.
public class Add {
     SUBOK a = new SUBOK();
     int d = a.aValue(); Aiaiaiai.
public void Add() {
         int b;
         int c = 0;
         b = d+c;
         System.out.println(b);
}First of all do not name a method the same as a class. Second most of this class appears to be based mainly in the realm of wishful thinking. In programming, wishing that something will "just work" without understanding the basics of why and how it works does, pretty much 100% of the time, not end well.
You need to take a number of steps back from this code, get grounded in some fundamentals and then make another attempt. I would highly recommend putting the Swing (or any other GUI) code aside for some time now. Inter-object communication is a fundamental part of OO and thus a fundamental part of Java and this code clearly shows that you don't understand it yet at all.
Start here [_Learning The Java Language_|http://java.sun.com/docs/books/tutorial/java/index.html]
If you have questions as you go through the tutorial do come back and ask them and someone here will be glad to help you. But in order to help you with code you have to be at a point where you understand things like variable scope, the difference between a class and an Object and how, why and what methods can be used to exchange information between two instances.

Passing values and calling other classes?

Hello all.
I have 2 classes(separate .java files). One is a login class and the other is the actual program. Login class(eventually exe file) should open the other class and pass the login parameters if you know what I mean. Is this possible, or do the 2 classes need to be part of one file?
Thanks alot
Milan D

Login class can be another class in another file
wht u have to do is to make an instance of login class in the class u want to use that class
like login lg = new Login();
and call method of login class
lg.setUser(username);
where setUser(String user); is a method of login class
this way u can pass the parameters to login class
i hope this might be helpful
regards
Moazzam

Calling other classes

First off, I should note that I'm new here, and this question is probably ridiculously easy to fix, but I'll give it anyway.
I am making a game (Mini Golf) using the FANG engine (http://www.fangengine.org). I'm not sure if that matters for this problem, but it may. Anyway, the game consists of a bounce engine, a putting engine, and the levels. I'd like to have each level in its own class, with the main class containing the engines and having something like this in it.
<code>
if (ballGoesInHole)
holeOn = holeOn + 1;
if (holeOn = 2)
runLevel2Class();
</code>
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qwerty96 wrote:
Ok, I think I've got a handle on that. Just one thing, however. I have an arrayList that will be added to in the other classes. So if I create an arrayList in The Main class, then how do I add to it in the other classes?Expose a public void addThing(Thing thing) method from the Main class, yes?
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Toby, thanks for the reply.
You're welcome.
I notice from elsewhere on this forum, you're clearly a JNI expert.
I've been known to work with it a little from time to time. =)
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God bless,
-Toby Reyelts
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From the JNI spec:
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jfieldID fid = ...
env->SetObjectField(retval, fid, da);
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public void doSomething() {
for (int i = 0; i < 100; i++) {
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Classpath for JNI call in NT4?

?I prepare MyClass for JNI call on iPlanet 6 running on NT. The corresponding DLL is put in WINNT\SYSTEM32. The classpath set in registry is updated too. But error "class not found. (no MyClass in java.library.path)" still occurs. Is there any work i miss? Please advise.?

Hi,
Can you check the Environment variable CLASSPATH ?, the application server's classpath found under Software/iPlanet->Application Server->6.0->Java using kregedit.
Thanks & Regards
Ganesh .R
Developer Technical Support
Sun Microsystems
http://www.sun.com/developers/support

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Hi,
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An unrecoverable stack overflow has occurred.
An unexpected exception has been detected in native code outside the VM.
Unexpected Signal : EXCEPTION_STACK_OVERFLOW (0xc00000fd) occurred at PC=0x5FF88497
Function=unpack_data+0x189D7
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Thanks in advance.

I found in this forum a piece of code with a same kind problem but It is simpler than mine. I have proved this program in Windows and it produce the same error. In Linux it runs but if I enlarge the array largebuf it ends with the same error. In Linux I can reserve until 2 MB (in windows +-256K). Is there any way to increase the stack size in a jni call?.
#include <stdio.h>
#include <jni.h>
#include "test.h"
int myprint2(int a, int b){
     char extrabuf[100];
     printf("got here next\n");
     extrabuf;
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int myprint(int a, int b){
     char largebuf[260000];
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test.java
public class test{
     public native int init();
     public static void main(String []args){
          new test();
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          System.out.println(this.init());
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How can I call a java class from within my program?

I was wondering if there's a platform independent way to call a java class from my program.

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How to call a Java class from another java class ??

Hi ..... can somebody plz tell me
How to call a Java Class from another Java Class assuming both in the same Package??
I want to call the entire Java Class (not any specific method only........I want all the functionalities of that class)
Please provide me some slotuions!!
Waiting for some fast replies!!
Regards
Smita Mohanty

Hi Smita,
you just need to create an object of that class,thats it. Then you will be able to execute each and every method.
e.g.
you have developed A.java and B.java, both are in same package.
in implementaion of B.java
class B
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How to call a java class in a bat file

Hi
I need to call a Test.java class in a bat files .It refer .DOM.jar
in C:/url; How do i call the java class i need the syntax
Thanks lot

assuming lanch.bat, Test.class and DOM.jar are in c:\url
assuming %JAVA_HOME% is defined (else substitue it with your java installation directory)
here is the content of launch.bat:
cd C:/url (or cd c:\url ) (or cd c: followed by cd url)
%JAVA_HOME%\bin java -classpath .;DOM.jar Test
hop that'd help,
marvinrouge

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