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Suppose I insert 5 strings in an ArrayList. Will the order of insertion and retrieval from the ArrayList be the same?
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ArrayList maintains the insertion order i.e order of the object in which they are inserted. HashSet is an unordered collection and doesn't maintain any order. ArrayList allows duplicate values in its collection.
ArrayList is random access. You can insert and remove elements anywhere within the list. Yes, you can use this as a FIFO data structure, but it does not strictly enforce this behavior. If you want strict FIFO, then use Queue instead.
An ArrayList can be sorted in two ways ascending and descending order. The collection class provides two methods for sorting ArrayList. sort() and reverseOrder() for ascending and descending order respectively.
To fetch an element from ArrayList, we can use the get(int index) method. This method takes an index as input and returns the element at that index . The index provided should be equal or greater than zero and should be less than ArrayList size. We can fetch the size of the ArrayList using the size() method.
Yes. ArrayList is a sequential list. So, insertion and retrieval order is the same.
If you add elements during retrieval, the order will not remain the same.
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