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Easy Learn Java: Programming Articles, Examples and Tips - Page 431


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Question: What is difference between sets and lists?

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Answer: Unlike sets, lists typically allow duplicate elements. More formally, lists typically allow pairs of elements e1 and e2 such that e1.equals(e2), and they typically allow multiple null elements if they allow null elements at all. It is not inconceivable that someone might wish to implement a list that prohibits duplicates, by throwing runtime exceptions when the user attempts to insert them, but we expect this usage to be rare.



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Posted by jalex on Thursday, January 26, 2006 (00:00:00) (2155 reads)

Iterator vs Enumeration?

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Answer: An iterator over a collection. Iterator takes the place of Enumeration in the Java collections framework. Iterators differ from enumerations in two ways:

  • Iterators allow the caller to remove elements from the underlying collection during the iteration with well-defined semantics.
  • Method names have been improved.


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Posted by jalex on Monday, January 23, 2006 (00:00:00) (11221 reads)

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