Loops

Question 1

Which interface must be implemented to allow an object to be iterated by a “for-each” loop?

Answer 1

Iterable<T>

Question 2

What is the equivalent code for: Iterable.forEach(Consumer action)?

Answer 2

for(var e : obj) {
action.accept(e);
}

Question 3

1. What is the syntax of a for loop?
2. Can a for loop have multiple initializers?
3. Is “init” reinitialized for each iteration?

Answer 3

1. for(init; expression; inc) {...}
2. Yes
3. No, only initialized once