Vague outline

While Loops

explain while loop
- simple example

Compare to for loop
- for loops are a coding shortcut for a while loop with a counter
- examples
- loop forever until exit condition
- exit condition needs to be known in advance
- explain exactly when the loop exits

while using arrays
- simple array example
- using a boolean
- (possibly using the result of a method call)

do.. while
- explain
- difference to while loop
- using arrays
- danger of always doing one iteration

big example