575: Mainline

Iterators simplify for loops. All you need in a for loop's Boolean expression is a hasNext expression:

Iterator i = mainVector.iterator(); 
for (; i.hasNext();) {  
 ... i.next() ... 
 } 

If you like, you can move variable declaration and initialization inside the for loop, producing a compact expression:

for (Iterator i = mainVector.iterator(); i.hasNext();) {  
 ... i.next() ... 
 }