Reduce unnecessary memory usage | JSPs

Use local variables, avoid inappropriate use of non-final getter methods

Accessing member data is slower than accessing a local variable, and calling a non-final or non-private getter method is even slower. There are sometimes good reasons to call non-final or non-private getter methods (it allows subclasses to override the getter behavior). Be sure that you use them with that in mind. However, calling the same non-final or non-private getter method twice in the same method is slower than necessary (and may have unintentional side effects since you cannot control the behavior of a subclass). Use a local variable to avoid calling the getter more than once per method call. For example, do this:

int total = 0; 
int amt = getAmount();
if (amt>0) {
total += amt;
}

 Not this:

int total = 0;
if (getAmount()>0) {
total += getAmount();
}