What is the difference between Set and List?
In Java, a
Set is an interface that extends the
Collection interface. It is an unordered collection of objects, in which each object can occur only once. A
Set does not allow duplicate elements.
List is an interface that extends the
Collection interface. It is an ordered collection of elements, in which each element has a specific position in the list. A
List allows duplicate elements.
Here are some key differences between
Setis an unordered collection, while
Listis an ordered collection.
Setdoes not allow duplicate elements, while
Listallows duplicate elements.
Listhas a specific index for each element, while
Setdoes not have a specific index for its elements.
There are several implementations of the
List interfaces in the Java Collections Framework, including
TreeSet, ArrayList, and
LinkedList. You can choose the implementation that is most appropriate for your use case based on your requirements for order, duplicates, and performance.