Create an instanz of a class

Hello,
I am devloping an a simple struts Applikation (Name Hello)
The structur my Webapp.
the Applikation ist in C:\Tomcat\webapps\Hello
HelloAction.java in
C:\Tomcat\webapps\Hello\WEB-INF\classes\org\java\example
HelloForm.java in
C:\Tomcat\webapps\Hello\WEB-INF\classes\org\java\example
code:
public
package org.java.example;
public class HelloForm
package org.java.example;
public class HelloAction
public ActionFrward execute( ....)
HelloForm helloForm = new HelloForm();
I compile the class HelloForm to create FelloForm.class // no problem
I compile the class HelloAction ERROR !!!!!!!!!!!
C:\Tomcat\webapps\Hello\WEB-INF\classes\org\java\example>javac HelloAction.java
cann not resolve sympole
sympole: class HelloForm
location: org.java.example.HelloAction
HelloForm helloForm=new HelloForm();
what is to change
the CLASSPATH or something in conf. of tomcat or ???
thanks

there ar somone in this world to help me !!!

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Re: How do you create and use "common" type classes?

Hi,
You have 2 potential solutions in your case :
1- Sub-class TextNullable class of Framework and add your methods in the
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Robinson, Richard a écrit:
I'm relatively new to forte and I'd like to know how can you handle utility
type classes that you want to use through out your application? Ideally
what I want is a static class with static methods.
Let's say that I have a StringUtil class that has a bunch of methods for
manipulating strings.
My problem is that we have code that runs on the client and code that runs
on the server. Both areas could use the StringUtil class, but from what I
understand, I have to create StringUtil in a plan and then create a server
object of type StringUtil. The server object will eventually get assigned
to a partition. That's not good since I really want the server object to
physically reside at the server end and at the client end. (Actually, I
don't want a server object, I just want to invoke a static method of a
static class).
Any clues on how to solve this problem would be appreciated.
Also, what is the url at Sage-it that has a summary of all emails that have
been posted to [email protected]? Perhaps this question has been
answered previously.
Thanks in advance
To unsubscribe, email '[email protected]' with
'unsubscribe forte-users' as the body of the message.
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Hi Richard,
Your question about "utility classes" brings up a number of issues, all of
which are important to long-term success with Forte.
There is no such thing as a static method (method that is associated with a
class but without an implicit object reference - this/self/me "pointer") in
TOOL, nor is there such thing as a global method (method not associated
with a class at all). This is in contrast to C++, which has both, and
Java, which has static methods, but not global classes. Frequently, Forte
developers will write code like this:
result, num : double;
// get initial value for num....
tmpDoubleData : DoubleData = new;
tmpDoubleData.DoubleValue = num;
result = tmpDoubleData.Sqrt().DoubleValue;
tmpDoubleData = NIL; // send a hint to the garbage collector
in places where a C++ programmer would write:
double result, num;
// get initial value for num....
result = Math::Sqrt(num);
or a Java programmer would write:
double result, num;
// get initial value for num....
result = Math.sqrt(num);
The result of this is that you end up allocating an extra object now and
then. In practice, this is not a big deal memory-wise. If you have a
server that is getting a lot of hits, or if you are doing some intense
processing, then you could pre-allocate and reuse the data object. Note
that optimization has its own issues, so you should start by allocating
only when you need the object.
If you are looking for a StringUtil class, then you will want to use an
instance of TextData or TextNullable. If you are looking to add methods,
you could subclass from TextNullable, and add methods. Note that you will
still have to instantiate an object and call methods on that object.
The next issue you raise is where the object resides. As long as you do
not have an anchored object, you will always have a copy of an object on a
partition. If you do not pass the object in a call to another partition,
the object never leaves. If you pass the object to another partition, then
the other partition will have its own copy of the object. This means that
the client and the server will have their own copies, which is the effect
you are looking for.
Some developers new to Forte will try to get around the lack of global
methods in TOOL by creating a user-visible service object and then calling
methods on it. If you have a general utility, like string handling, this
is a bad idea, since a service object can reside only on a single
partition.
Summary:
* You may find everything you want in TextData.
* Unless you anchor the object, the instance will reside where you
intuitively expect it.
* To patch over the lack of static methods in TOOL, simply allocate an
instance when required.
Feel free to email me if you have more questions on this.
At the bottom of each message that goes through the mailing list server,
the address for the list archive is printed:
http://pinehurst.sageit.com/listarchive/.
Good Luck,
CSB
-----Original Message-----
From: Robinson, Richard
Sent: Tuesday, March 02, 1999 5:44 PM
To: '[email protected]'
Subject: How do you create and use "common" type classes?
I'm relatively new to forte and I'd like to know how can you handle utility
type classes that you want to use through out your application? Ideally
what I want is a static class with static methods.
Let's say that I have a StringUtil class that has a bunch of methods for
manipulating strings.
My problem is that we have code that runs on the client and code that runs
on the server. Both areas could use the StringUtil class, but from what I
understand, I have to create StringUtil in a plan and then create a server
object of type StringUtil. The server object will eventually get assigned
to a partition. That's not good since I really want the server object to
physically reside at the server end and at the client end. (Actually, I
don't want a server object, I just want to invoke a static method of a
static class).
Any clues on how to solve this problem would be appreciated.
Also, what is the url at Sage-it that has a summary of all emails that have
been posted to [email protected]? Perhaps this question has been
answered previously.
Thanks in advance

Create an instance of my class variable

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<p>
Selection.h
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int _choice;
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-(int) Choice;
//Setters
-(void) setChoice:(int) input;
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</p>
So in the above code it's the [humanChoice setChoice:1] that is not working. When I step through that portion with the debugger I get no errors but when I call humanChoice.Choice later on in the code I get a zero.
-NifflerX

It worked, thank you so much. I put
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Creating multiple instances of a class in LabVIEW object-oriented programming

How do you create multiple instances of a class in a loop? Or am I thinking about this all wrong?
For instance, I read in a file containing this information:
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First of all, let's get your terminology correct. You are not creating multiple instances of a class. You are creating Objects of the class.
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Why cannot create instance to an abstract class?

Dear Developers....
abstract class can create be its own constructor but why they didn't create object

We cann't create an object for abstract class
because they have abstract methods which depends on
its subclass for its implementation. if it is
possible to create the object for abstract class
means then you can call a method which has no
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one thats what the ruleWhat about classes with no abstract members?
public abstract class A {}No danger of accessing anything illegal here.
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Trying to create an array of a class

This is the first time ive tried to use an array so its not surprising im having trouble.
this is my program:
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          System.out.println("Enter the number of students you wish to record");
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}And it lets me compile it but when i enter a number it gives me the error:
Exception in thread "main" java.lang.NullPointerException
at studentRecordDemo.main(studentRecordDemo.java:15)the
So yeah im trying to create an array of the class "studentRecord" and the number is input by the user. Is there a way to make that work or would it be easier to just make the array a really high number?

your error is in here:
student[index].readInput();its null...
This is the first time ive tried to use an array so
its not surprising im having trouble.
this is my program:
import java.util.*;
public class studentRecordDemo
     public static void main(String[] args)
          int studNum, index;
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ts you wish to record");
          Scanner keyboard = new Scanner(System.in);
          studNum = keyboard.nextInt();
studentRecord student[] = new
ew studentRecord[studNum];
          for (index = 0; index < studNum; index++)
          {student[index].readInput();
          student[index].writeOutput();}
}And it lets me compile it but when i enter a number
it gives me the error:
Exception in thread "main"
java.lang.NullPointerException
at
studentRecordDemo.main(studentRecordDemo.java:15)the
So yeah im trying to create an array of the class
"studentRecord" and the number is input by the user.
Is there a way to make that work or would it be
easier to just make the array a really high number?

How to create an instance of a class which is stored in a String?

I've class name stored in a String Object.
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How to create an object of a class?

plz read the question carefully ..
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kajbj wrote:
rajeev-usendi wrote:
thanks but still i have problem..
i have created the object but now i m unable to do anything with that created object..
i have coded like this..
Object o= Class.forName("java1").new Instance();
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KajI agree with Kaj. If you need to use a class that's unavailable at compile time, you should create an appropriate interface by which to refer to the class and then you create instances reflectively and access them normally via their interface (which is called reflective instantiation with interface access)

How to create an instance of a class?

how do you create sn instance of a class, and how do you call a method from another class?

You may need to read thru the information provided on this page to understand how to create objects: http://java.sun.com/docs/books/tutorial/java/data/objectcreation.html
I'd also suggest you read the tutorial available at: http://java.sun.com/docs/books/tutorial/java/index.html
Regarding how you call a method belonging to another class you could do it in the foll. ways depending on whether the method is static or not - a static method may be called using the class name followed by a dot and the static method name while a non-static method would require you to create an instance of the class and then use that instance name followed by a dot and the method name. All said and done i'd still suggest you read thru the complete Java programming tutorial to get a good grounding on all these concepts and fundamentals of the language if you are looking to master the technology.
Thanks
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Creating different instances of one class

Hi everyone thanks so much for all the help so far! I want to create a new instance of class coauthorship everytime the loop goes around to a new record! However thats not whats happening it only creates 1 instance of coauthorship and it is overwritten with every loop here is Class Coauthorship
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        title = TITLE;
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One thing to remember is that when you write:
Coauthorship c = new Coauthorship(name1, name2, TITLE);
Coauthorship c is creating a reference variable that points to an object that is of class type Coauthorship. It is NOT the object itself. It only points to the object in question.
It is the new Coauthorship(...) that actually creats the object in memory. So each time through the loop you are asking for a new Coauthoriship object and a new reference to that new object. Of course, Java (meaning the JVM) may (or always will - not sure here) re-use the reference variable at the same memory location. You loose the reference to each object create in the previous loop iteration leaving you with a reference pointing to the last object created in the loop when the loop ends.
If you could state in plain English what your goal is, that would help. From your code, I can tell that the goal (or problem domain) is not clear. Or at least, how to achieve that goal is not clear. State the requirements using ergular words (not psuedo code or such) that would help get things a little clearer.

Create an instanz of a class

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