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It seems that both Iterator and Stream are lazy and allow you to keep returning elements to your heart's content. What's the difference between the two?
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Iterators, in Java, are used in Collection Framework to retrieve elements one by one. A stream in Java is a pipeline of objects from an array or a collection data source. A sequential stream is one in which the objects are pipelined in a single stream on the same processing system.
An iterator is not a collection, but rather a way to access the elements of a collection one by one. The two basic operations on an iterator it are next and hasNext . A call to it. next() will return the next element of the iterator and advance the state of the iterator.
The Stream is a lazy lists where elements are evaluated only when they are needed. This is a scala feature. Scala supports lazy computation. It increases performance of our program. Streams have the same performance characteristics as lists.
Unlike operations directly on a concrete collection like List , operations on Iterator are lazy. A lazy operation does not immediately compute all of its results.
Stream memoises and Iterator does not. You can traverse the same Stream multiple times and get the same result each time. Iterator, on the other hand, can only be traversed once.
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