If those objects are so similar, then it is not necessary to create different classes. You could pass a parameter, an id for example, and then draw things depending on that id. Example:

1. Object obj ;
   
   void setup()
   {
     size(300, 300) ;
     obj = new Object () ;
   }
   
   void draw()
   {
     background(0) ;
     obj.display() ;
   }
   
   class Object{
     int n ;
     InnerObject[] objects;
   
   
     Object() {
       n=3;
       objects = new InnerObject[n];
   
       for ( int i = 0 ; i < n ; i++ ) {
         objects[i] = new InnerObject(i) ;
       }
     }
   
     void display(){
       text ("Total class Objects: " + objects.length, 20, 20 ) ;
       for ( int i = 0 ; i < n ; i++ ) {
         objects[i].display();
       }
     }
   }
   
   // class called
   class InnerObject
   {
     int id;
    
     InnerObject (int id) {
       this.id = id;
     }
    
     void display() {
       text((id+1)+". class object", 20, 40+(id*20)) ;
     }
   }

Maybe that doesn't fit for what you want to achieve, but then you might have to explain it in more detail.

Thanks a lot for your quick answer Benja,

Sure, I must give more information.
The classes is close just by the name. I want code a soft where it's very easy to add a class inside. Just put the .pde in the folder, change the text where is write the number of classes...and run.
In the final the "InnerClasses" in very different and maybe very big, very small... So I need a class Object to classified all the classes add in the soft. I think I need something to give a name dynamictly to classes call, or may be an other way to make somthing close.
You can see the alpha of the soft here http://bit.ly/ILF8T2 now I work on the Beta.

Hello,

you could name the class house1, house2 or whatever but with a number at the end.

You could write a program (name program B) that generates the code for your main program (name porgram A) and you put the generated code into an extra tab in your program and then call it from outside.

E.g. this program produces code afaik: http://www.openprocessing.org/sketch/60524

This code you could generate via the other program (B):

1. void callHouse(int numberOfClass) {
2. 
   
3. switch (numberOfClass) {
4. case 1:
5. // handle house1
6. break;
7. 
   
8. case 2:
9. // handle house2
10. break;
11. 
    
12. and so on...
13. .....
14. 
    
15. }
16. }

This code you could paste into program A.
Then you can easily call the function in program A via

1. callHouse(1);

and thus have a wrapper around the whole 30 classes.

Also the classes house1 etc. you can generate from another program C.
Or at least their raw structure with name, vars, constructor, main methods and closing }.

Greetings, Chrisir  

Hmmm, I'm not sure to see what you mean Chrisir...about programA and programB.
I just don't want write a lot of lines of code to call the class "Object99" for example because if there is 98 classes before it's crazy 99 line to make the classes, 99 line to call the class, 99 line by void of each classes...
So I don't understand why you suggest me to use a switch() in this case ?

May be i'm not very clear with the idea I want to explaine.

PS : the code for you'r example is awsome.. I like Vertex :)

For me it is still not clear what you want to do. It is possible to instantiate classes from a string, that represents the class name. It is not that simple and you have to do a lot of error-handling, have a closer look at this java.lang-reflect, or search for "java reflection".
I think a parent-class or an interface would be useful, when all you classes share the same public methods or fields.
Here is an example, that shows the concept. I put the classes into seperate .java-files.

processing sketch:

1. import java.lang.reflect.*;
   import java.lang.ClassNotFoundException;
   ArrayList<Parent> objects;
   
   void setup() {
     objects = new ArrayList<Parent>();
   
     for (int i = 0; i<3; i++) {
       try {
         String className = "Child"+i;
         Class myClass = Class.forName(className);
         Constructor constructor = myClass.getConstructor();
         Object instanceOfMyClass = constructor.newInstance();
         objects.add((Parent)instanceOfMyClass);
       }
       catch(ClassNotFoundException e) {
         println(e);
       }
       catch(NoSuchMethodException e) {
         println(e);
       }
       catch(InstantiationException e) {
         println(e);
       }
       catch(IllegalAccessException e) {
         println(e);
       }
       catch(InvocationTargetException e){
         println(e);
       }
     }
   
     for (int i =0; i< objects.size(); i++) {
       objects.get(i).traceId();
     }
   }

I'm sure benja's idea is better, but my idea was adressing your issue:

I just don't want write a lot of lines of code to call the class "Object99" for example because if there is 98 classes before it's crazy 99 line to make the classes, 99 line to call the class, 99 line by void of each classes...

My idea was to generate the code automatically by program B that generates the code for your main program (name porgram A).

You paste the code to programA and hide the code in another tab (with the switch). You then use this as a wrapper for 99 classes. A wrapper is a box you can hide the content in (the interfaces for 99 classes) and use it from the outside.

Thus you can just call them in a for-loop and say

1. for (i = 0 .....  ) {
2.    callHouse(i);
3. }

That's it.

Same goes for making the 99 classes

1. for (i = 0 .....  ) {
2.    callNew_House(i);
3. }

and so on.

Greetings, Chrisir  

Thanks I work on this two ways this w.-e. if I fint the time. Sure the solution is close.
I'll give the feed back when I have worked on it.

Ok, the result of my work it's I'm very begginer.
I try to make something to create classes with your JAVA way, but nothing work. I try to understand the Java.reflect it's very complexe for me.
In the Child extended class I make a void to test...I don't find a solution to activate the Child. Except by :
Child1 child1 >>> child1 = new Child1() >>> child1.test()
but I don't want that !!!!
And other problem when i use println(listObj.size()) ; the result is "0"

1. // import java.lang.ClassLoader.*;
   import java.lang.reflect.*;
   // import java.lang.Object.*;
   import java.lang.ClassNotFoundException.*;
   
   ArrayList<Parent> listObj;
   
   Class myClass ;
   Object myObject ;
   
   int n = 5 ;
   
   void setup()
   {
     size(300,300) ;
    
     listObj = new ArrayList<Parent>();
    
     for ( int i = 0 ; i < n ; i++ ) {
       String className = "Child" + (i+1) ;
       String classObjectName = "child" + (i+1) ;
      
       // bloc (Try Catch), Pure Java
       try
       {
         myClass.forName(className);
         Constructor c = myClass.getConstructor() ;
         myObject = c.newInstance() ;
         listObj.add((Parent)myObject);
       }
      
       // use that with : Class myClass = Class.forName(className);
       catch(ClassNotFoundException e) {
         println(e);
       }
       // use that with : Constructor constructor = myClass.getConstructor();
       catch(NoSuchMethodException e) {
         println(e);
       }
       // use that with : Object instanceOfMyClass = constructor.newInstance();
       catch(InstantiationException e) {
         println(e);
       }
       catch(IllegalAccessException e) {
         println(e);
       }
       // use with newInstance
       catch(InvocationTargetException e){
         println(e);
       }
     }
       ////////////
     for (int i =0; i< listObj.size(); i++) {
      listObj.get(i).test() ;
     }
     /////////////////////////
     println(listObj.size()) ;
   }
   ////////////
   
   public class Parent {
     protected int id;
     protected Parent() {}
     public void traceId() { System.out.println(id); }
   }
   ////
   public class Child0 extends Parent {
     public Child0() { id =0; }
     void test() { println("test ok Zero" ) ; }
   }
   ////////
   public class Child1 extends Parent{
     public Child1() { id =1; }
     void test() { println("test ok One" ) ; }
   }
      
   

Thx for you help

So...I make a separate class parent.java child0.java and child1.java with Eclipse... But I don't know to run the program :(

For me reflection is kind of difficult, too. As i wrote it is possible to do this, but it is not simple, if you have no experience with java or inheritance.
I think you have to use seperate java-classes, classes in processing are always internal classes, and i think that does not work. You can create the java-files with any texteditor. If you put them into your sketch-folder, next to your pde-file, they should show up as tabs in processing when you reopen your sketch.
 
Another problem in your code above is that you try to call test(), a function of the child-classes, that does not exist in the parent-class. That cannot work, because you cast the objects to Parent. You could create a function test() in the parent-class and override it with the test-method of a child-class.


Then this line seems to be wrong:

1.       myClass.forName(className);

Perfect,
now it's work perfectly when I put the .java in the folder. I don't need to change myClass.forName(className); to myClass = Class.forName(className); I think it's an other style to write this line. I see that on Internet when I search to understand something to JAVA :)

Now I must find a solution to use the child1 to chilp99. It's my purpose. In my idea it's write very different thing in the child.

Sure it's on good way.

I feel a big problem. Now than my class child is .java ; it's not possible to write in Processing style ? because I try and the answer ir's an error.

Yes, .java files need a PApplet instance to call Processing functions...

So the problem come step by step.
Thx all for the  .java and the PApplet

Now I try to call different thing like ellipse, text...and I want can call all the possibility of proessing not just println :)
But the answer is NullPointerException, so I read the breakingNews from processing and it talking about PGraphic so I add PG at the top, but same answer...I don't find a track about that on the forum.

1. import java.lang.reflect.*;
   import java.lang.ClassNotFoundException;
   ArrayList<Parent> objects;
   // PApplet p ;
   
   void setup() {
     size(300,300) ;
     objects = new ArrayList<Parent>();
   
     for (int i = 0; i<3; i++) {
       try {
         String className = "Child"+i;
         Class myClass = Class.forName(className);
         Constructor constructor = myClass.getConstructor();
         Object instanceOfMyClass = constructor.newInstance();
         objects.add((Parent)instanceOfMyClass);
       }
       catch(ClassNotFoundException e) {
         println(e);
       }
       catch(NoSuchMethodException e) {
         println(e);
       }
       catch(InstantiationException e) {
         println(e);
       }
       catch(IllegalAccessException e) {
         println(e);
       }
       catch(InvocationTargetException e){
         println(e);
       }
     }
   
     for (int i =0; i< objects.size(); i++) {
       objects.get(i).traceId();
      
       // test to acces to child void
       //objects.get(0).traceId.test();
     }
     println("Nombre de classes appelées " + objects.size()) ;
   }

I still fail to understand what you are trying to do exactly. I feel that you use the wrong solution for your problem. Perhaps inheritance (OOP) is better suited to your need.
The Projet Romanesco page doesn't help in understanding your goal...

If you need to add user flexibility to your project, perhaps using a scripting system, like BeanScript or JavaScript (natively available via the Java ScriptEngine) or even Lua (I am playing with Luaj currently) might be better suited to your need.

PS.: Identité est féminin, mais invariant en genre...

PPS.: You need to pass 'this' to your new class (usually via the constructor, but can use a setter too) to fill in the p field.

Ok, I try to explain my project. The Project Romanesco is a VJing application for the "Artcoder". The picture you can see on the blog page is the Alpha. Actually I try to start the Beta. My goal is to make an application in Processing where it's very easy  for the other "Artcoder" to add the class Object in the application. It's for this reason I try to find a system to add a class in folder whitout change too much the main program. My idea for "Artcoder" is just to change file.txt with the number of classes and add the class in the folder and Run Romanesco. Sure the "Artcoder" need to follow a path to code the class, but that's it.

And for two reasons I need to use Processing : For the "Artcoder" and for me, because I know just Processing. I code just for one year, I'm begginer.

Now, it's less obscur ?

PS : J'ai changé la faute d'orthographe, la vérité(e) :)

" just to change file.txt with the number of classes and add the class in the folder and Run Romanesco"
If you mean "run from the PDE", it can work.
Otherwise, since Java is a compiled language, it cannot work as easily. That's why I advised to use a scripting language, although doing so isn't trivial...