07-linked_lists_2 - 1 CSE 143 Lecture 7 More Linked Lists...

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Unformatted text preview: 1 CSE 143 Lecture 7 More Linked Lists slides created by Marty Stepp http://www.cs.washington.edu/143/ 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; 2 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. 4 IMPORTANT There are only two ways to change the structure of a linked list: 1) change the value of front this changes the starting point of the list example: front = null; 2) change the value of <something>.next , where <something> is a temporary variable that refers to a node in the list this changes a link in the list example: current.next = null; 2 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....
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This note was uploaded on 09/29/2010 for the course CSE 143 taught by Professor Sr during the Spring '08 term at University of Washington.

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07-linked_lists_2 - 1 CSE 143 Lecture 7 More Linked Lists...

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