Linked List in Java | Collections Framework | Java Collections | Java Tutorial For Beginners
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LinkedList:
LinkedList is a class which implements List interface.
The underlying data structure for LinkedList is Doubly Linked List.
Duplicate elements are allowed
Insertion order is preserved.
Heterogeneous objects are allowed
null insertion is possible.
LinkedList is defined in java.util package.
LinkedList is best suite for frequent insertion or deletion operation in the middle of the Array.
LinkedList is NOT best suitable for frequent Retrieval operation.
Usually LinkedList is used to implement Stacks(LIFO) and Queues(FIFO). For this purpose LinkedList defined 6 more specific methods:
Methods:
void addFirst(Object o) : Adds the element at first position of the LinkedList
void addLast(Object o) : Adds the element at last position of the LinkedList
Object getFirst() : Gets the element at first position of the LinkedList
Object getLast() : Gets the element at first position of the LinkedList
Object removeFirst() : Removes the element at first position of the LinkedList
Object removeLast() : Removes the element at first position of the LinkedList
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