An ArrayList is ordered collection (also known as a sequence). It means that the user of controls where each element is inserted. This class is very
HashTable vs HashMap vs HashSet
11:15 AM
HashtableHashtable is basically a datastructure to retain values of key-value pair. It didn’t allow null for both key and value. You will get NullPointerException
11:15 AM
Collections vs Collection
11:13 AM
Collection is the root interface in collection hierarchy,groups multiple elements into a single unit, it allows duplicate & non-duplicate elements
11:13 AM
Other nonabstract methods can access a method that you declare as abstract.But first, let's look at when to use normal class definitions and when to
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