Creating an instance of a class from within another class

I am trying to create an instance of MCQ in the T class but I am getting this error:
File: E:\JAVA PROGRAMS\assignment 1\T.java [line: 15]
Error: cannot find symbol
symbol : class MCQ
location: class T
here are the two classes:
// class T
import java.awt.*;
import java.util.*;
import java.lang.*;
public class T{
public T(String aT)
pest = aT;
public static T t_one()
T aT = new T("Calculator");
aT.addQ(new MCQ( " 2 + 2", "equals 4", "equals 5", "equals 0", " equals -2",
"is a prime number", 1));
return aT;
private String pest;
//class Q
import java.awt.*;
import java.util.*;
import java.lang.*;
public abstract class Q{
Vector q = new Vector();
public String aT;
abstract void addQ(Q aQ);
public class MCQ extends Q{
String a,b,c,d,e,f,g;
int answer;
public MCQ (String a, String b, String c, String d, String e, int answer)
this.a = a;
this.b = b;
this.c = c;
this.d = d;
this.e = e;
this.answer = answer;
void addQ(Q aQ)
q.addElement(new T(aT));
I tried to make reference to MCQ by doing this in class T:
MCC qT = new MCQ() ;
but that presents a whole other set of problems.
please help I think I have tried everything!

Use code tags (http://forum.java.sun.com/help.jspa?sec=formatting)
Don't import java.lang.* . You get those automatically.
Your MCQ class is really Q.MCQ (the way you posted, anyway).
If Q weren't abstract, you could do:
new Q().new MCQ(...)But, you can't create a Q without defining 'add'. You could do it anonymously, but that makes no sense. Put Q and MCQ in separate files and try again.

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why do you want to call the second class by its main method ??
Why not have another static method with a meaningfull name and well defined parameters ?
main is used by the jvm as an entry point in your app. it is not really meant for two java applications to communicate with each other but main and the code is not really readable.
Have a look at his sample
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the problem with the code above is
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Request.getParameter("blah") from within a class?

Hi Everyone,
Not sure if I'm missing something...
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Take a step back from all that, and read the error message: cannot find symbol: symbol:variable request
Is "request" a variable you have declared or passed into your method getTheParams() ?
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Or the BeanUtils.populate method provided by Jakarta Commons BeanUtils.
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Cheers,
evnafets

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Is it possible to call methods from another class from within an abstract c

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Yes - you can use addclass() and you can use UI.
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On Sat, Apr 25, 2015 at 8:56 AM mads18950258 <[email protected]>

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erikku wrote:
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================================================================================
CREATE OR REPLACE PROCEDURE user_forum_requestsaccess (
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AS
var_forumid NUMBER;
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var_forum_access NUMBER;
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================================================================================
Regards Goran

you don't have to use execute when you want to execute a procedure (only on sql*plus, you would use it)
just give the name of the funtion
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as
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as
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/

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Thanks

So, how do I invoke a method in a class from a different class?Demo:
public class Main {
    public static void main(String [] args) {
     Test1 t1 = new Test1();
     Test2 t2 = new Test2();
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     String s = t2.method2(i);
     System.out.println(s);
class Test1 {
    public int method1() {
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class Test2 {
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}Output is "ten".
Edited by: newark on May 28, 2008 10:55 AM

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Hi Reny,
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How to access private attribute of a class from its Friend Class

Hi Experts ,
I am coding in Method (DO_SAVE) of class /BOBF/CL_TRA_TRANSACTION_MGR.
I need to access private variable ( MO_BOPF) of class /BOBF/CL_TRA_SERVICE_MGR ( Friend of /BOBF/CL_TRA_TRANSACTION_MGR ).
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Regards- Abhishek

Hi Reny,
You should be able to access by creating object of friend class.
Sample:
data lo_frnd     TYPE REF TO /BOBF/CL_TRA_SERVICE_MGR.
data lo_compl type REF TO /BOBF/IF_TRA_TRANS_MGR_COMPL.
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"access the private object of friend class
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Hope this helps you.
Regards,
Rama

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I have an event that executes upon a button value change. I would
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> It seems that an event fired from within another event does not
> actually execute its code until the firing event completes. The fired
> event's Time value in its Event Data Node indicates the time that it
> was told to execute, but using GetTickCount calls shows that its code
> does not execute until the firing event is finished. This happens
> whether Value Signaling is used to generate a Value Change event or if
> CreateUserEvent and GenerateUserEvent is used. Is this because events
> are placed in a queue ? This behavior is different from Delphi for
> example where the fired event executes right away when called from the
> firing event (before the firing event completes).
I'm not that familiar with Delphi, but LV events are asynchronous.
Window
s OS has two ways of firing events, Send and Post. The LV events
are always posted. The primary reason is that the LV events are handled
by a node, not by a callback. The node you are calling is in the middle
of a diagram, and reentering it not valid.
> I have an event that executes upon a button value change. I would
> like that same event's code to execute when another button is pressed,
> but also have other code in the second button's event execute after
> that first button's event's code completes. Is there another way to
> accomplish this ?
The best way to reuse code is to use subVIs. Firing events, or rather
sending events is pretty close in other events to making a function call
dispatched to anyone interested in the event. The event just hides who
you are calling and makes you put your parameters in a funny format
stuffed inside the event. IMO it also makes the code very hard to read
since you don't know what calls what.
Instead, just put the code into a sub
VI and call it whenever you need
to, from the event structure in one or more locations, and from other
loops and diagrams.
Greg McKaskle

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I can't figure out the best way to handle this. I wanted to just be able to pass the helper class a String if somebody wanted to specify a filename other than the default filename. Does it make sense to specify a file URL instead? Is there any other way to get the calling servlet's context path without having to pass in a variable?
Thanks

It seems that the helper API shouldn't need to be given a path to its own config file. I would like to have code that will load the file regardless of whether or not its in a stand alone java app or a servlet. Whenever the helper API is jarred up and imported into my servlet, it can't find the config file unless it's in the "D:\Program Files\Apache Software Foundation\Apache Tomcat 6.0.14\bin\test" directory. OR, if I use the current thread to get the loader, it will locate it in the "classes" folder, which is the only solution I can come up with that will let me write code to load the file that will work, regardless of its implementation.
The "project" folder I'm talking about is just the NetBeans "project" folder for the servlet, or the "ServetSandBox" folder in my example. I guess that doesn't really matter in the context of the servlet though.
So is using the current thread the appropriate way to do this? When you say that code will work if I put the resource in the WEB-INF directory, that seems to only be true if I try to load it from the servlet itself, not the helper class. The helper class doesn't find the resource in the WEB-INF directory.
Also, I would like to be able to write the default values to a new config file if one doesn't exist. How in the heck do I get a pointer to the "classes" folder, or any other folder that I can also read from using the classloader, so I can write to a new file?

Creating an instance of a class from within another class

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