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Why is there the method iterator() defined on the interface java.util.Collection when it already extends java.util.Iterable which has this very method defined.
I'm thinking some sort of backward compatability or an opportunity to write some JavaDoc on the method at the collection level.
Any other ideas?
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An Iterator is an object that can be used to loop through collections, like ArrayList and HashSet. It is called an "iterator" because "iterating" is the technical term for looping. To use an Iterator, you must import it from the java. util package.
Iterator enables you to cycle through a collection, obtaining or removing elements. ListIterator extends Iterator to allow bidirectional traversal of a list, and the modification of elements. Before you can access a collection through an iterator, you must obtain one.
As per Sun , "Iterator. remove is the only safe way to modify a collection during iteration; the behavior is unspecified if the underlying collection is modified in any other way while the iteration is in progress."
Backwards compatibility. Iterable was not introducted until 1.5 with the for(Object o : iterable) construct. Previously, all collections had to provide a means to iterate them.
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