take this for example
int i;
for (i=0; i<15; i++)
{
system.out.println(i);
system.out.println();
}
this would print out
0
1
2
...
15
the i= is wat i starts at. The i< is wat it finishes, and I++ mean it add 1 each time.
and itl repeat the loop till it reaches the number that is befor <