Linked lists
- 2. What are linked lists? • Structure to store data similar to a train. DATA REF DATA REF DATA REF DATA REF Value Address
- 3. Why linked list? • When the number of elements stored may change. Program reports students’ final scores from a Fall Java class: Array of 50 students 75 83 46 75 95 15 65………………………………. What if the number of students changes to 60 two weeks into the Fall quarter? We need a dynamic data structure. 75 REF 83 REF 46 REF 75 REF ADD ME!!
- 4. Why linked list? • Insertions and deletions achieved without moving all the elements. In an array: 75 83 46 75 95 15 65 12 ………………………………….. In a list: 75 REF 83 REF 46 REF 75 NULL 12 REF
- 5. List in Java – the Node structure DATA REF Value Address public class Node { //Data public String studentName; public int score; //Reference to next node public Node next; }
- 6. Nodes and references Name Score Stacy Edmund 75 Huan Liu 46 Neil Walters 83 Erwin Espinoza 75 Neil Walters 83 Node@1034bb5 Huan Liu 46 Node@7f5f5897 1034bb5
- 7. List structure First In Last Out Erwin REF Neil REF Huan REF Stacy NULL Name Score Stacy Edmund 75 Huan Liu 46 Neil Walters 83 Erwin Espinoza 75 H H = Header Node HH
- 8. Adding to a list • Add Cindy Chang at position 3 Erwin REF Neil REF Huan REF Stacy NULL Cindy REF
- 9. Deleting from a list • Remove Neil Waters Erwin REF Neil REF Huan REF Stacy NULL Cindy REF