I am trying to writing something that identifies which Array number is the greatest present under a certain situation. I have this if statement that tells me when an ArrayList object is inside the radius of another object, and I'm trying to writing something so that that object can identify which of the present objects is greatest in the ArrayList. Does that make sense?

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for(int i=enemies.size()-1; i>=0; i--){
     Enemy peng = (Enemy) enemies.get(i);

     float dis = dist(x,y, peng.x,peng.y);
     float addedRadii = 8+diameter/2;
     TowMiliSec++;

     if(dis <= addedRadii){
       
       /*
          I tried to write something here that can tell me
          which ArrayList Object has the greatest 'i' under
          the circumstances of this if statement. For example,
          lets say the objects with the 'i' 8, 7, 6, 5 are inside this
          radius (or "if statement"). How could I write something that
          will spit out the number 8, seeing that it's the largest
          number out of those four?
       */
       
       float biggestFac = max(x-peng.x,y-peng.y);
       float fac = biggestFac/3;

       float vx = x/fac;
       float vy = y/fac;

       if(peng.x<x){
         vx *= -1;
       }
       if(peng.y<y){
         vy *= -1;
       }

       if(TowMiliSec%60 == 0){
         if(control3 == 0){
           bullets.add(new Bullet(x,y, vx,vy, false, damage));
           control3++;
         }
       }
       else{
         control3 = 0;
       }
     }

     for(int j=bullets.size()-1; j>=0; j--){
       Bullet bull = (Bullet) bullets.get(j);
       bull.move();
       bull.impact();      

       if (bull.hit()) {
         bullets.remove(j);
       }
     }
   }

Oh, sorry, I'm still new to processing and the forum. Ummm, I know this might sound like a stupid question for you, but how do define nums? How do you tell it how many i's are present under that if statement?

so, i have to make a new array to keep track of the i's in the array list?

Potentially I'm not understanding the problem, but, since you're counting the i's backwards from enemies.size() to 0, the greatest i is always going to be the first one that you hit, right?  So you could just do

maxNumI = -1

outside of the loop

and then,

if (dis <= addedRadii && maxNumI == -1){
//do something with i, here, to keep track of it, or whatever
}