How to call main method in one class from another class

Suppose i have a code like this
class Demo
public static void main(String args[])
System.out.println("We are in First class");
class Demo1
public static void main(String args[])
System.out.println("We are in second class");
In the above program how to call main method in demo calss from Demo1 class......???????

No, i dont know how to call other than main methods from other classes
And one more doubt i have i.e. Like in C can we see the execution of the program like how the code is being compiled step by step and how the value of the variable changes from step to step like(Add Watch).........

Similar Messages

How to call a method in one JSP from another JSP?

say that I have 2 JSPs.
JSP one has a button.
JSP two has some method that, say, find the square root of the number passed from JPS one.
How to - when click - the button on page one call the method on page two?
Please note that I can not use object binding, but I want passing the actual parameter and call the method on page two.
Please note that this is an update of a previous post on the same topic called "Object scope".
Thank you all very much.

No, i dont know how to call other than main methods from other classes
And one more doubt i have i.e. Like in C can we see the execution of the program like how the code is being compiled step by step and how the value of the variable changes from step to step like(Add Watch).........

Need call a method of one iview from another iview

Hi,
There are 2 iviews in a component.
1) FirstView - contains abc() method & xyz() methods
2) SecondView (a popup) - asdf() method
i want to call abc() method from asdf() method. i.e. i want to call a method of the firstview from the secondview.
Note:
1) i couldn't able to copy the code of abc() method to component controller, as it has the code which uses (iview) local attributes (this can be done by context mapping) & main reason is from the method it calls the xyz() method of the same view (again i couldn't call a method of iview from component controller).
2) firstView contain 5 tabs, i want to be in the same tab from which secondview (popup) was called, if i use fire plugs between both view, the current tab will be chnaged (i suppose, not sure).
3) can we use event handlers, if yes how can we do that.
Please provide a better solution for calling a method of view from another view.
Thanks
Maha
Edited by: Maha Hussain on Jan 13, 2009 12:40 PM

Hi Maha,
It is better to have such methods in the component controller to make it reusable and avoid writing same code again and again.
You can have that method in component controller and call that method on click on a button from Iview1 and can pass the parameters in the mthgod only.
for example.
Say Method abc() which is currently in Iview1 and you are passing values from context say aa bb cc to the method now what i am suggesting is
have that method abc(String aa, String bb, String cc) ;
and call it on click on button in Iview1 and pass the required parameters.
Hope this will help
Regards
Narendra

How to call a method of one dc in another dc

Hi,
i have two dcs dc1 and dc2
i want to call the method of dc1 interface controller in component controller of dc2
plz help me, how to acheive it
Thanks & regards,
v santhosh

Hi Vanama,
Hope you have defined a method say method1() in interface controller of DC1
Add this to public part.
In DC2 , set DC1 as used DC.
give <DCUsageName>
now you can access the method in DC1 like this.
wdThis.wdGet<DCUsageName>().getmethod1();
Regards,
Murtuza

How to call the task flow one region from another region?

I have page with 3 regions (column wise) named as start, center, end.
currently I having task flow for middle(i.e, center) region which have panelCollection to perform view, create, & delete functions.
Task flow:-
From(action)To
View(create)Create
Create(Done)Execute (Execute is a method call)
Execute(*)View
View(self)Execute
By press create button on Center page, task flow takes to the Create page(in Centre region) but all other regions(start, end) remains same.
I have a usecase where we have a commandLink on Start region to show the View page on Center region. but it is not able to achieve when we move to Create/Edit page.
Plz help me out to built the same.
Thanq
KSB
Edited by: user641407 on Aug 28, 2008 2:22 PM
Edited by: user641407 on Aug 28, 2008 2:23 PM

Hi!
First, I'm not sure that your page layout is adequate. The regions are not intended to be navigated from outside. Yet, they can send navigation action to the container (page on which the region is placed) through Parent Action taskflow element. Also, you can investigate Contextual Events that can be raised by region, but I'm also not sure that this can be easily used for cross-region navigation.
I would suggest you to reconsider you page layout. You can use dynamic regions (which are populated by taskflow based on menu selection or click on actionLink or s button). This way, in the Start facet you place a navigation menu (links), which are connected with dynamic region in Center. If you want to reuse a navigation links (in Start), you can put all this in page template and reuse it over and over again.
Regards,
PaKo

How to call a method of one view in other view

Hi
could any one suggest "how to call a method of one view in other view "
thanks
kaushik

Hi Kausic,
Its not possible to call a method from view to View.
Since view is private entity we can not pass the data directly.
I suggest you to declare the method in Component/Custom controller and call.
the code is,
wdThis.wdGet<Component/Custom Name>Controller().<methodName>();
Regards,
<b>Ramganesan K</b>

Can I Call method on one JVM from another through a dll?

Let me explain.
I have this java jar file that I can only have one instance of running at any given time. I'm using a shared data segment in a dll to store a bool indicating whether the program is already running or not. If it's already running, I have to not run the second instance and give focus to the current running instance.
The jar file calls a native method "canInstantiate()" on a dll to see if there's already an app running. If there isn't, the env and obj are stored in the shared data segment of the dll and we return true. If there is already an instance of the program running, I want canInstantiate call a function on the current instance of the jar (like a callback) to tell it to request focus. It's not working. Can someone tell me if my code is right?
The .h file
#include "stdafx.h"
#include <jni.h>
#include "CardServer.h"
#pragma data_seg("SHARED") // Begin the shared data segment.
static volatile bool instanceExists = false;
static JavaVM *theJavaVM = NULL;
static JNIEnv* theJavaEnv= NULL;
static jobject instanceObject = NULL;
static jmethodID mid = NULL;
static jclass cls = NULL;
#pragma data_seg()
#pragma comment(linker, "/section:SHARED,RWS")
jdouble canInstantiate(JNIEnv *env, jobject obj);
jdouble instantiate(JNIEnv *env, jobject obj);
jdouble uninstantiate(JNIEnv *env, jobject obj);
void grabFocus();
</code>
The .cpp file:
<code>
#include "MyFunctions.h"
#include <string.h>
#include <stdlib.h>
#include "stdafx.h"
#include <iostream.h>
jdouble canInstantiate(JNIEnv *env, jobject obj)
printf("In canInstantiate!!");
if (!instanceExists)
printf("No instance exists!!");
return (jdouble)0.0;
else
printf("An instance already exists!!");
grabFocus();
return (jdouble)1.0;
jdouble instantiate(JNIEnv *env, jobject obj)
printf("**In CPP: Instantiate!!\n");
cout << "At start, env is: " << env << endl;
cout << "At start, obj is: " << obj << endl;
if (instanceExists == false)
instanceExists = true;
theJavaEnv = env;
instanceObject = obj;
theJavaEnv->GetJavaVM(&theJavaVM);
cls = (theJavaEnv)->FindClass("TheMainClassOfTheJar");
if (cls == 0) {
fprintf(stderr, "Can't find Prog class\n");
exit(1);
mid = (theJavaEnv)->GetMethodID(cls, "grabFocusInJava", "(I)I");
if (mid == 0) {
fprintf(stderr, "Can't find grabFocusInJava\n");
exit(1);
printf("About to call grabFocusInJava\n");
grabFocus();
printf("CPP: After the grab focus command in instantiate!!\n");
cout << "At end, env is: " << env << endl;
cout << "At end, obj is: " << obj << endl;
return 0.0;
else
printf("CPP: Finished Instantiate!!\n");
return 1.0;
jdouble uninstantiate(JNIEnv *env, jobject obj)
printf("CPP: In uninstantiate!!\n");
if (instanceExists == true)
instanceExists = false;
theJavaVM = NULL;
instanceObject = NULL;
printf("CPP: Finishing uninstantiate!!\n");
return 0.0;
else
printf("CPP: Finishing uninstantiate!!\n");
return 1.0;
void grabFocus()
printf("In CPP::GrabFocus!!\n");
instanceObject = theJavaEnv->NewGlobalRef(instanceObject);
cls = (theJavaEnv)->FindClass("CardFormatter");
if (cls == 0) {
fprintf(stderr, "Can't find Prog class\n");
exit(1);
printf("Got the cls id again!!\n");
if (cls == 0)
printf("IT'S INVALID!!\n");
mid = (theJavaEnv)->GetMethodID(cls, "grabFocusInJava", "(I)I");
if (mid == 0) {
fprintf(stderr, "Can't find grabFocusInJava\n");
exit(1);
theJavaEnv->CallIntMethod(instanceObject, mid, 2);
printf("Called grabFocusInJava\n");
</code>
thanks in advance

Can I Call method on one JVM from another through a dll
...The rest of your question merely expands on your title.
And the answer to that question is no.
When you call a method you are executing a "thread of execution." A thread of execution exists only in a single process. It can not exist in another process.
If the dll is doing some interesting things then you could call a method that sets a flag. Data can move between instances. But you would then have to have a thread in that different process monitoring that flag. And sharing data in a dll is not a normal process, so it would have to be coded appropriately.
If all you want to do is set the current focus to the existing application, then that can be done with existing windows functionality. You don't need to do anything special in your dll. You can probably search these forums to find the exact code. If not there are countless examples in windows repositories (like MSDN) on how to do that.

How to kill one class from another class

I need to dipose one class from another class.
So that first i have to find what are all threads running in that class and then to kill them
Assist me.

Subbu_Srinivasan wrote:
I am explaining you in clear way
No you haven't been.
>
In my application i am handling many JInternalFrame.Simultaneously i am running working on more than one frame.
Due to some poor performance of some thread in one JInternalFrame,the thread is keeps on running .
i could not able to proceed further on that screen.
So i have to kill that JInternalFrame.Yoinks.
To be begin with your problem sounds like you are doing everything in one thread. So stop doing that. Second when you get it split up and if a task is taking too much time then interrupt it. No kill. Interrupt. This means the worker thread needs to check sometimes if it has been interrupted.

Accessing a variable defined in one class from another class..

Greetings,
I've only been programming in as3 for a couple months, and so far I've written several compositional classes that take MovieClips as inputs to handle behaviors and interactions in a simple game I'm creating. One problem I keep coming upon is that I'd love to access the custom variables I define within one class from another class. In the game I'm creating, Main.as is my document class, from which I invoke a class called 'Level1.as' which invokes all the other classes I've written.
Below I've pasted my class 'DieLikeThePhishes'. For example, I would love to know the syntax for accessing the boolean variable 'phish1BeenHit' (line 31) from another class. I've tried the dot syntax you would use to access a MovieClip inside another MovieClip and it doesn't seem to be working for me. Any ideas would be appreciated. Thanks,
- Jeremy
package jab.enemy
import flash.display.MovieClip;
import flash.events.Event;
import jab.enemy.MissleDisappear;
public class DieLikeThePhishes
private var _clip2:MovieClip; // player
private var _clip3:MovieClip; //phish1
private var _clip4:MovieClip; //phish2
private var _clip5:MovieClip; //phish3
private var _clip6:MovieClip; //phish4
private var _clip10:MovieClip; // background
private var _clip11:MovieClip // missle1
private var _clip12:MovieClip // missle2
private var _clip13:MovieClip // missle3
private var _clip14:MovieClip // missle4
private var _clip15:MovieClip // missle5
private var _clip16:MovieClip // missle6
private var _clip17:MovieClip // missle7
private var _clip18:MovieClip // missle8
private var _clip19:MovieClip // missle9
private var _clip20:MovieClip // missle10
private var _clip21:MovieClip // missle11
private var _clip22:MovieClip // missle12
var ay1 = 0;var ay2 = 0;var ay3 = 0;var ay4 = 0;
var vy1 = 0;var vy2 = 0;var vy3 = 0;var vy4 = 0;
var phish1BeenHit:Boolean = false;var phish2BeenHit:Boolean = false;
var phish3BeenHit:Boolean = false;var phish4BeenHit:Boolean = false;
public function DieLikeThePhishes(clip2:MovieClip,clip3:MovieClip,clip4:MovieClip,clip5:MovieClip,clip6:M ovieClip,clip10:MovieClip,clip11:MovieClip,clip12:MovieClip,clip13:MovieClip,clip14:MovieC lip,clip15:MovieClip,clip16:MovieClip,clip17:MovieClip,clip18:MovieClip,clip19:MovieClip,c lip20:MovieClip,clip21:MovieClip,clip22:MovieClip)
_clip2 = clip2;_clip3 = clip3;_clip4 = clip4;_clip5 = clip5;_clip6 = clip6;
_clip10 = clip10;_clip11 = clip11;_clip12 = clip12;_clip13 = clip13;_clip14 = clip14;
_clip15 = clip15;_clip16 = clip16;_clip17 = clip17;_clip18 = clip18;_clip19 = clip19;
_clip20 = clip20;_clip21 = clip21;_clip22= clip22;
_clip3.stage.addEventListener(Event.ENTER_FRAME, onEnterFrame)
function onEnterFrame(event:Event):void
vy1+= ay1;_clip3.y += vy1; vy2+= ay2;_clip4.y += vy2;
vy3+= ay3;_clip5.y += vy3; vy4+= ay4;_clip6.y += vy4;
if (phish1BeenHit ==false)
if(_clip3.y >620)
{_clip3.y = 620;}
if (phish2BeenHit ==false)
if(_clip4.y >620)
{_clip4.y = 620;}
if (phish3BeenHit ==false)
if(_clip5.y >620)
{_clip5.y = 620;}
if (phish4BeenHit ==false)
if(_clip6.y >620)
{_clip6.y = 620;}
if (_clip11.hitTestObject(_clip3) ||_clip12.hitTestObject(_clip3)||_clip13.hitTestObject(_clip3)||_clip14.hitTestObject(_cl ip3)||_clip15.hitTestObject(_clip3)||_clip16.hitTestObject(_clip3)||_clip17.hitTestObject( _clip3)||_clip18.hitTestObject(_clip3)||_clip19.hitTestObject(_clip3)||_clip20.hitTestObje ct(_clip3)||_clip21.hitTestObject(_clip3)||_clip22.hitTestObject(_clip3))
_clip3.scaleY = -Math.abs(_clip3.scaleY);
_clip3.alpha = 0.4;
ay1 = 3
vy1= -2;
phish1BeenHit = true;
if (_clip11.hitTestObject(_clip4) ||_clip12.hitTestObject(_clip4)||_clip13.hitTestObject(_clip4)||_clip14.hitTestObject(_cl ip4)||_clip15.hitTestObject(_clip4)||_clip16.hitTestObject(_clip4)||_clip17.hitTestObject( _clip4)||_clip18.hitTestObject(_clip4)||_clip19.hitTestObject(_clip4)||_clip20.hitTestObje ct(_clip4)||_clip21.hitTestObject(_clip4)||_clip22.hitTestObject(_clip4))
_clip4.scaleY = -Math.abs(_clip4.scaleY);
_clip4.alpha = 0.4;
ay2 = 3
vy2= -2;
phish2BeenHit = true;
if (_clip11.hitTestObject(_clip5) ||_clip12.hitTestObject(_clip5)||_clip13.hitTestObject(_clip5)||_clip14.hitTestObject(_cl ip5)||_clip15.hitTestObject(_clip5)||_clip16.hitTestObject(_clip5)||_clip17.hitTestObject( _clip5)||_clip18.hitTestObject(_clip5)||_clip19.hitTestObject(_clip5)||_clip20.hitTestObje ct(_clip5)||_clip21.hitTestObject(_clip5)||_clip22.hitTestObject(_clip5))
_clip5.scaleY = -Math.abs(_clip5.scaleY);
_clip5.alpha = 0.4;
ay3 = 3
vy3= -2;
phish3BeenHit = true;
if (_clip11.hitTestObject(_clip6) ||_clip12.hitTestObject(_clip6)||_clip13.hitTestObject(_clip6)||_clip14.hitTestObject(_cl ip6)||_clip15.hitTestObject(_clip6)||_clip16.hitTestObject(_clip6)||_clip17.hitTestObject( _clip6)||_clip18.hitTestObject(_clip6)||_clip19.hitTestObject(_clip6)||_clip20.hitTestObje ct(_clip6)||_clip21.hitTestObject(_clip6)||_clip22.hitTestObject(_clip6))
_clip6.scaleY = -Math.abs(_clip6.scaleY);
_clip6.alpha = 0.4;
ay4 = 3
vy4= -2;
phish4BeenHit = true;
if (_clip3.y > 10000)
_clip3.x = 1000 +3000*Math.random()-_clip10.x;
_clip3.y = 300;
_clip3.alpha = 1;
_clip3.scaleY = Math.abs(_clip3.scaleY);
ay1 = vy1 = 0;
phish1BeenHit = false;
if (_clip4.y > 10000)
_clip4.x = 1000 +3000*Math.random()-_clip10.x;
_clip4.y = 300;
_clip4.alpha = 1;
_clip4.scaleY = Math.abs(_clip4.scaleY);
ay2 = vy2 = 0;
phish2BeenHit = false;
if (_clip5.y > 10000)
_clip5.x = 1000 +3000*Math.random()-_clip10.x;
_clip5.y = 300;
_clip5.alpha = 1;
_clip5.scaleY = Math.abs(_clip5.scaleY);
ay3 = vy3 = 0;
phish3BeenHit = false;
if (_clip6.y > 10000)
_clip6.x = 1000 +3000*Math.random()-_clip10.x;
_clip6.y = 300;
_clip6.alpha = 1;
_clip6.scaleY = Math.abs(_clip6.scaleY);
ay4 = vy4 = 0;
phish4BeenHit = false;
var missleDisappear1 = new MissleDisappear(_clip11,_clip3,_clip4,_clip5,_clip6,_clip10);
var missleDisappear2 = new MissleDisappear(_clip12,_clip3,_clip4,_clip5,_clip6,_clip10);
var missleDisappear3 = new MissleDisappear(_clip13,_clip3,_clip4,_clip5,_clip6,_clip10);
var missleDisappear4 = new MissleDisappear(_clip14,_clip3,_clip4,_clip5,_clip6,_clip10);
var missleDisappear5 = new MissleDisappear(_clip15,_clip3,_clip4,_clip5,_clip6,_clip10);
var missleDisappear6 = new MissleDisappear(_clip16,_clip3,_clip4,_clip5,_clip6,_clip10);
var missleDisappear7 = new MissleDisappear(_clip17,_clip3,_clip4,_clip5,_clip6,_clip10);
var missleDisappear8 = new MissleDisappear(_clip18,_clip3,_clip4,_clip5,_clip6,_clip10);
var missleDisappear9 = new MissleDisappear(_clip19,_clip3,_clip4,_clip5,_clip6,_clip10);
var missleDisappear10 = new MissleDisappear(_clip20,_clip3,_clip4,_clip5,_clip6,_clip10);
var missleDisappear11 = new MissleDisappear(_clip21,_clip3,_clip4,_clip5,_clip6,_clip10);
var missleDisappear12 = new MissleDisappear(_clip22,_clip3,_clip4,_clip5,_clip6,_clip10);

I would approach it in much the same way as you would in java, by making getters and setters for all of your class variables.
Getters being for returning the values, Setters being for setting them.
So you would make a get function for the variable you want to access ala:
function get1PhishBeenHit():boolean {
return this.phish1BeenHit;
Then to access the value of that variable from outwith the class:
var result:boolean = ClassInstanceName.get1PhishBeenHit();

How Do I Run A Class From Another Class?

Hiya everyone, id like to know how to run a class from another class.
Ive got a Login class which extends a JFrame and a Personnel class which also extends a JFrame. When i press the login button (in Login class), ive got it to decide if password/login are acceptable and if they are, I want the Login class to close then run the Personnel class.
Im just after the code which says to close this class and run the Personnel class. How do i do that?
Ive researched this but couldnt get an understandable answer!
Help would be much appreciated, Ant...

This is the Login Class:
public class MainMenu extends javax.swing.JFrame {
    Statement statement = null;
    int currentRecord;
    ResultSet rs = null;
    String name = null, job = null, mission = null, login = null, password = null;
    String loginVal;
    String passwordVal;
    /** Creates new form MainMenu */
    public MainMenu() {
        initComponents();
        try{
            Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
            String filename = System.getProperty("user.dir") + "/src/Personnel.mdb";
            String database = "jdbc:odbc:Driver={Microsoft Access Driver (*.mdb)};DBQ=" + filename;
            Connection conn = DriverManager.getConnection( database , "","");
            statement = conn.createStatement();
            System.out.println("Connected...ok");
        } catch (Exception e) {
            System.err.println("Got a connection Problem!");
            System.err.println(e.getMessage());
    private void btnLoginActionPerformed(java.awt.event.ActionEvent evt) {
        loginVal = txtLogin.getText();
        passwordVal = txtPassword.getText();
        String name = null, job = null, mission = null, login = null, password = null;
        try{
            rs = statement.executeQuery("SELECT Login,Password FROM Personnel WHERE Login = '" + loginVal + "' ");
            System.out.println("TRYING SELECT CLAUSE");
            if(rs.next()){
                System.out.println("THERE IS A NEXT RECORD");
                login = rs.getString(1);
                password = rs.getString(2);
                System.out.println("GOT THE NEXT RECORD");
                System.out.println(login + password);
            System.out.println("Query Complete");
        }catch(Exception s){
            //s.printStackTrace();
            System.out.println("NO RECORDS EXIST FOR THIS LOGIN ID");
        if(passwordVal.equals(password)){
            System.out.println("Access Granted"); //CLOSE MAIN AND RUN CONTROL CLASS
        } else{
            System.out.println("Access Denied"); //RE-RUN CLASS
    }

How to call a method in private section of a class in the public section

Hi Everybody,
i have written a method(meth1) in the private section of a class(C1).
it is as follows
class C1 definition.
private section.
methods: meth1 importing im_dt1 like tp1
                                         im_dt2 like tp2
                                         im_dt3 like tp3
                                         im_dt4 like tp4
                           returning value(re_dt1) like tp5.
endclass.
i have the final data that has to be displayed in internal table re_dt1.
now my question is how to call this method present in private section into public section and display the data present in re_dt1.
Thanks,
learning.abap.

Hi,
what you need is one public method being called at start-of-selection. Within this the private methods have to be called.
The question is, why has the method for reading the database tables to be private? If you have only one private method reading all database tables the public method being called at start-of-selection will only consist of a call-method statement.
This seems to be one call to much.
The logic for reading the different database tables is hidden inside the class anyway.
Is there any further logic reading the different database tables?
Have always all table to be read? If not another approach would be one private method for each database table being called by a public method deciding which table has to be read:
public section.
methods get_data returning value(re_Dt1).
private section.
methods:
get_table_a returning value(im_dt1),
get_table_b returning value(im_dt2),
get_table_c returning value(im_dt3),
get_table_d returning value(im_dt4),
combine_data importing im_dt1
                                im_dt2
                                im_dt3
                                im_dt4
                        returning value(re_dt1).
*- implementation of public method:
method get_data.
data: lt_dt1 ...
           lt_dt2,
           lt_dt3,
           lt_dt4.
* here decide which tables have to be read:
lt_dt1 = get_table_a( ).
lt_dt2 = get_table_b( ).
lt_dt3 = get_table_c( ).
lt_dt4 = get_table_d( ).
re_dt1 = combine_data( i_dt1 = lt_dt1
                                       i_dt2 = lt_dt2
                                       i_dt3 = lt_dt3
                                       i_dt4 = lt_dt4 ).
endmethod.
*- implementation of private methods
method get_table_a.
endmethod.
method get_table_b.
endmethod.
method get_table_c.
endmethod.
method get_table_d.
endmethod.
method combine_data.
endmethod.
Regards
Dirk

How to call a method in the servlet from an applet

I want to get the data for the applet from the servlet.
How to call a method that exits in the servlet from the applet? I want to use http protocol to do this.
Any suggestions? Please help.
thanks

Now that Web Services is around, I'd look at possibly implement a Web Service call in your applet, which can then be given back any object(s) on return. Set up your server side to handle Web Service calls. In this way, you can break the applet out into an application should you want to (with very little work) and it will still function the same

Is there any way to call methods of one view from another

Hi experts,
I am new to webdynpro.I am having some requirement in which I need to call methods of one view from some other view of same component .So is there any way to do this.

Dear Pradeep,
This will solve your problem......( plz 1st read everything ..)
There are 2 views :
i) Mandatory Attributes ' view(V1)
ii) Button' s View..(V2)
1. Create a method in Component Controller.( M1).
2. Goto V2 . In the Action Handler method of Button , call method M1 of component controller.
3. Write your Code in M1 instead of V2 method.
4. Create an EVENT ( E1 ) in component controller.
5. Fire this event from M1 before executing Action Code.
6. Now Add the event handler method of E1 in V1 ( i.e. Mandatory attributes view. ) ..........clear????? .. set "METHOD TYPE" = Event Handler. instead of Method.
7. In this event handler method in V1 , write the "check_mandatory_attribute_view" method.
8. use necessary flags..
Regards ,
Aditya.

Instantiating an Array declared in a class from another class

Hi Guys,
I am working on a project for University and I'm stuck with this thins, which I'm sure is pretty easy when you know how...
I have a first class "Courses" in which I declare my Array, here is the code:
import java.util.*;
public class Courses
private String[][] Listing;
Courses(String[][] l)
   l = Listing;
}This class compiles just fine but I have 2 problems:
1/ Can I make sure that this array will be [3][4] ?
When I try : "private String[3][4] Listing;" or "Courses(String[3][4] l)" the class doesn't compile anymore...
FYI: I want to store the followings in my array:
French Language, 250, 130, 70
Painting, 270, 140, 70
Yoga, 250, 130, 70
2/ How can I instantiate this from another class?
From a class "Booking" I want to be able to create a new array "Listing" by calling my constructor from the Courses class and populate it with the above data (course,full-time price, part-time price, Concessions price )
How do I do that?

Thanks, I've modofied my code as follows:
import java.util.*;
public class Courses
private String[][] Listing = new String[3][4]; //create array 3 rows * 4 columns
Courses(String[][] l)
   l = Listing;
int i;
int j;
int p;
String t;
String p1;
String getTitle(int i) //return Course Title
   t=Listing[0];
return t;
int getPrice(int i, int j) //return Price (Full-Time, Part-Time, Concessions)
p1=Listing[i][j];
p=Integer.parseInt(p1);
return p;
now from my nex class Booking I want to instantiate Courses:
public class Booking
Courses c = new Courses()
}How do I actually pass the data to this...what's the syntax so that my instance will be:
c[0][0]="French Language"
c[0][1]="250"
c[0][2]="130"
c[0][3]="70"
c[1][0]="Painting"
c[1][1]="270"
c[1][2]="140"
c[1][3]="70"
c[2][0]="Yoga"
c[2][1]="250"
c[2][2]="130"
c[2][3]="70"
Thanks in advance,
Tom

How to call a static method of a class from another class?

Hello,
I have two classes in a package. The first one
package my package;
public class class1
protected static ImageIcon createIcon(String path)
The second one
package my package;
public class class2
private ImageIcon image1;
image1 = class1.createIcon("/mypath");
This does not work since class2 cannot load the appropriate image. Where do I have to define the ImageIcon variables in class one or two and do they have to be static variables?
Thanks in advance
Christos

If the two classes are in the same package, that will work, in fact. A trivial example:
package foo;
public class Foo1 {
     protected static String getString() {
          return "World";
// Note: Member of the same package
package foo;
public class Foo2 {
     public static void main(String[] argv) {
          System.out.println("Hello "+ foo.Foo1.getString());
}However, if they are in different packages that won't work - the protected keyword guarantees that only classes derived from the class with the protected method can access it: Therefore this will not work:
package foo;
public class Foo1 {
     protected static String getString() {
          return "World";
package foo.bar;
public class Foo2{
     public static void main(String[] argv) {
          System.out.println("Hello "+ foo.Foo1.getString());
}But this will:
package foo;
public class Foo1 {
     protected static String getString() {
          return "World";
package foo.bar;
public class Foo2 extends foo.Foo1 {
     public static void main(String[] argv) {
          System.out.println("Hello "+ foo.Foo1.getString());
}I think you should read up a bit more about packages and inheritance, because you're going to have a lot of trouble without a good understanding of both. Try simple examples first, like the above, and if you hit problems try to produce a simple test case to help you understand the problem rather than trying to debug your whole application.
Dave.

How to call main method in one class from another class

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