Computer Science Canada

Simulator display issues
Author:  Tallguy [ Mon Mar 07, 2011 6:34 pm ]
Post subject:  Simulator display issues
Hello hello,

I for my assignment it is to continue on the steps to creating a fully working LoTR battle simulator, each assignment building off each other. This assignment to is randomize 'actor' variables (name/speed etc) for a user defined army (light/dark) and for a size that they speficify. Im kinda new to java so . . .

-we need a array of refences that refernecs individual 'actors' then display everything to the screen


code:
for (int i=0; i<nLightArmy; i++){
        armyOfLight[i] = new ActorFactory();
        armyOfLight[i].armyOfLight();
        //JOptionPane.showMessageDialog(null,armyOfLight[i].toString());
        outPut +=armyOfLight[i].toString();
                                       
}
        for (int i=0; i<nLightArmy; i++){
                JOptionPane.showMessageDialog(null,armyOfLight[i].toString());
}
        //JOptionPane.showMessageDialog(null,outPut + "\n");


im having a problem with displaying all the data together on one GUI screen, each class 'sends' it data forward but i cant seem to get the data to display i get 'ActorFatcory@15443e54' for each actor?? Why is this doing it?
Author:  Tony [ Mon Mar 07, 2011 7:23 pm ]
Post subject:  RE:Simulator display issues
1) Generics make Java suck less.
code:

List<Actor> armyOfLight = new ArrayList<Actor>();

for(Actor army_member : armyOfLight) {
  ...
}

No casting. No off-by-one errors. Awesome APIs for the data structure.

Quote:

'ActorFatcory@15443e54' for each actor

Yes, you're assigning an ActorFactory instead of an Actor.
code:

armyOfLight[i] = new ActorFactory();


A factory pattern is typically used as:
code:

ActorFactory my_factory = new ActorFactory();
...
my_actor = my_factory.get_new_actor();

But that only makes sense if creation of new instances involves processes outside of a typical constructor.
Author:  DemonWasp [ Mon Mar 07, 2011 8:01 pm ]
Post subject:  RE:Simulator display issues
The default implementation of the toString() method returns ClassName@Address. To make it display something else, override it by adding a method with this exact signature:

public String toString()

With an implementation that returns a String representing your Actor.
Author:  Tallguy [ Tue Mar 08, 2011 11:33 am ]
Post subject:  Re: Simulator display issues
awesome ty,
Tony i would use arraylist, but for this assignment we are not allowed.

This is what i did, and something in another class to fix my previous error
code:
for (int i = 0; i < nDarkArmy; i++) {
                        armyOfDarkness[i] = new ActorFactory();
                        armyOfDarkness[i].armyOfDarkness();
                        outPutDarkness += armyOfDarkness[i].actor.toString();
          }


now the only problem i have is.....

To display all the data i have used:

code:

public void dispalyAll() {
               
                JOptionPane.showMessageDialog(null , "Army of light ;" + outPutLight + "\nArmy of darkness;"+outPutDarkness);

}


why is 'null;' still showing up? it says "Army of light;null;.....data", what can i do to get rid of this?
Author:  Tony [ Tue Mar 08, 2011 1:15 pm ]
Post subject:  RE:Simulator display issues
So it seems that null is from outPutLight in
code:

"Army of light ;" + outPutLight

Search for the use of the name to see where you create this field, and how it is populated with data.

:


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