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Java / Java8 streams

Differences Between Aggregate Operations such as forEach and Iterators.

stream.forEach and iterator works similar in terms of functionality. The below are the differences in how they operate.

Aggregate operations.Iterator.
They process elements from the stream not directly on the collection..Iterator directly process the collection.
Aggregate operation use internal iteration/internal delegation, JDK determines how to iterate the collection through stream . Iterator use external iteration in which your application code determines both what collection it iterates and how it iterates it. .
Parallel computing is possible by divide and conquer strategy.It supports only sequential iteration.
You may customize the behavior of an aggregate operation by passing behavior as lambda expression in parameter.Not applicable.

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