© 2014 Goodrich, Tamassia, Goldwasser Singly Linked Lists1 Presentation for use with the textbook Data Structures and Algorithms in Java, 6 th edition,

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© 2014 Goodrich, Tamassia, Goldwasser Singly Linked Lists1 Presentation for use with the textbook Data Structures and Algorithms in Java, 6 th edition, by M. T. Goodrich, R. Tamassia, and M. H. Goldwasser, Wiley, 2014

© 2014 Goodrich, Tamassia, Goldwasser Singly Linked Lists2 Singly Linked List A singly linked list is a concrete data structure consisting of a sequence of nodes, starting from a head pointer Each node stores element link to the next node next element node ABCD  head

© 2014 Goodrich, Tamassia, Goldwasser Singly Linked Lists3 A Nested Node Class

© 2014 Goodrich, Tamassia, Goldwasser Singly Linked Lists4 Accessor Methods

© 2014 Goodrich, Tamassia, Goldwasser Singly Linked Lists5 Inserting at the Head Allocate new node Insert new element Have new node point to old head Update head to point to new node

© 2014 Goodrich, Tamassia, Goldwasser Inserting at the Tail Allocate a new node Insert new element Have new node point to null Have old last node point to new node Update tail to point to new node Singly Linked Lists6

© 2014 Goodrich, Tamassia, Goldwasser Singly Linked Lists7 Java Methods

© 2014 Goodrich, Tamassia, Goldwasser Removing at the Head Update head to point to next node in the list Allow garbage collector to reclaim the former first node Singly Linked Lists8

© 2014 Goodrich, Tamassia, Goldwasser Singly Linked Lists9 Java Method

© 2014 Goodrich, Tamassia, Goldwasser Removing at the Tail Removing at the tail of a singly linked list is not efficient! There is no constant-time way to update the tail to point to the previous node Singly Linked Lists10