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Index › Programming Questions & Help › Syntax Questions › How to name a new Object inside a for() loop

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How to name a new Object inside a for() loop ? (Read 671 times)

Flancke

How to name a new Object inside a for() loop ?
Dec 6^th, 2009, 7:41am

I want to create a new Object of the class "Meme" inside a for-loop.
I have to find a name for every new Object, so I decided to create the name based on the "i" of the loop.
nf() for translating the int i to a String.

But then it gives an Error: "Duplicate local variable Name".
What can I do to make him accept the given name of the Object?

for(int i = 0; i<linkliste.length; i++){
if(linkliste[i] != null){
String Memename = nf(i,3);

Meme Memename = new Meme(linkliste[i]);
}
}

antiplastik

Re: How to name a new Object inside a for() loop ?
Reply #1 - Dec 6^th, 2009, 8:35am

> I decided to create the name based on the "i" of the loop
You have to use an array (or an ArrayList) :

Code:

// declare the array of Meme objects
Meme[] memes;

// setup the array
memes = new Meme[linkliste.length];

// fill the array
for (int i = 0; i < linkliste.length; i++) {
  Meme memes[i] = new Meme(linkliste[i]);
}

You can shorten declaration and setup in one line :
Code:

Meme[] memes = new Meme[linkliste.length];

See the reference for further array processing (append(), etc.) or how to do handle objects collections with an ArrayList object.

blindfish

Re: How to name a new Object inside a for() loop ?
Reply #2 - Dec 6^th, 2009, 8:44am

If you want to create multiple objects in a loop it's usual to put them into a container object (e.g. Array, ArrayList etc.).

Code:

Ball b[];
int numBalls = 3;

void setup() {   
  size(420, 400); 

  // Instantiate balls array
  b = new Ball[numBalls];  
  //populate it:
  for (int i=0; i<numBalls; i++) {
    b[i] = new Ball();
  }
}

Then if you need to do something with the objects later you can just iterate over the container...

Where is the what if the what is in why?

Flancke YaBB Newbies Offline Posts: 27 France, Toulouse	Re: How to name a new Object inside a for() loop ? Reply #3 - Dec 6^th, 2009, 9:06am Ca marche! Thank you!

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