Top 10 questions about Java Collections–reference

reference from: http://www.programcreek.com/2013/09/top-10-questions-for-java-collections/

The following are the most popular questions of Java collections asked and discussed on Stackoverflow. Before you look at those questions,it's a good idea to see the .

is essentially an array. Its elements can be accessed directly by index. But if the array is full,a new larger array is needed to allocate and moving all elements to the new array will take O(n) time. Also adding or removing an element needs to move existing elements in an array. This might be the most disadvantage to use ArrayList.

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2. Efficient equivalent for removing elements while iterating the Collection