11-linked_list_2 - CSE 143 Lecture 11 More Linked Lists...

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CSE 143 Lecture 11 More Linked Lists reading: 16.2 - 16.3 slides created by Marty Stepp http://www.cs.washington.edu/143/
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2 Conceptual questions • What is the difference between a LinkedIntList and a ListNode ? • What is the difference between an empty list and a null list? – How do you create each one? • Why are the fields of ListNode public? Is this bad style? • What effect does this code have on a LinkedIntList ? ListNode current = front; current = null;
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3 Conceptual answers • A list consists of 0 to many node objects. – Each node holds a single data element value. • null list: LinkedIntList list = null; empty list: LinkedIntList list = new LinkedIntList(); • It's okay that the node fields are public, because client code never directly interacts with ListNode objects. • The code doesn't change the list. You can change a list only in one of the following two ways: – Modify its front field value. – Modify the next reference of a node in the list.
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4 Implementing remove // Removes and returns the list's first value. public int remove() { ... } – How do we remove the front node from a list? – Does it matter what the list's contents are before the remove?
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5 Removing front element • Before removing front element: • After first removal: After second removal: front = 20 next data front = 42 next data 20 next data element 0 element 1 element 0 front =
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6 remove solution // Removes and returns the first value. // Throws a NoSuchElementException on empty list.
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This note was uploaded on 01/04/2011 for the course CSE 143 taught by Professor Sr during the Spring '08 term at University of Washington.

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11-linked_list_2 - CSE 143 Lecture 11 More Linked Lists...

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