What's an effective way to reuse ArrayLists in a for loop?
- by Patrick
hi,
I'm reusing the same ArrayList in a for loop, and I use
for loop
results = new ArrayList<Integer>();
experts = new ArrayList<Integer>();
output = new ArrayList<String>();
....
to create new ones.
I guess this is wrong, because I'm allocating new memory. Is this correct ?
If yes, how can I empty them ?
Added: another example
I'm creating new variables each time I call this method. Is this good practice ? I mean to create new precision, relevantFound.. etc ? Or should I declare them in my class, outside the method to not allocate more and more memory ?
public static void computeMAP(ArrayList<Integer> results, ArrayList<Integer> experts) {
//compute MAP
double precision = 0;
int relevantFound = 0;
double sumprecision = 0;
thanks
