What is LinkedList?

LinkedList is a class that extends the AbstractSequentialList class and implements the List and Queue interfaces. LinkedList is a generic class. The class declaration is given below:

class LinkedList<E>

Here, E specifies the type of objects that the list will hold.

It defines the following two constructors:

• LinkedList(): It builds an empty linked list.
• LinkedList(Collection <?extends E >c): It builds a linked list that is initialized with the elements of a collection c

The LinkedList class defines the following methods for manipulating lists. These are as follows:

• void addFirst(E obj): This method inserts an element at the beginning of the list.
• void addLast(E obj): This method inserts an element at the end of a list
• E getFirst(): This method is used to retrieve the first element from the list.
• E getLast(): This method retrieves the last element from the list.
• E removeFirst(): This removes the first element from the list.
• E removeLast(): This method removes the last element from the list.

Here, obj specifies the item.

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