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Listen-Operationen Informatik 2 - Übung Klemens Schwarz head list Node.

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Presentation on theme: "Listen-Operationen Informatik 2 - Übung Klemens Schwarz head list Node."— Presentation transcript:

1 Listen-Operationen Informatik 2 - Übung Klemens Schwarz head list Node

2 Anlegen einer Liste 1.Klasse Node implementieren - beliebige Datenkomponenten (?: int, Number, Student, …) - Zeiger auf das nächste Node-Element (next) - Konstruktor implementieren 2.Knoten aneinanderhängen var n1:Node = new Node(1); var n2:Node = new Node(2, n1); 3. Ersten Knoten (head) merken ? ? next Node n1 Node n2 head

3 Knoten vorne einfügen head public function prepend(value:Entry):List { var node:EntryNode = new EntryNode(value, this.head); this.head = node; return this; } node

4 Knoten hinten anhängen head public function append(int value):List { var newNode:Node = new Node(value, null); var node:Node = this.head; var prev:Node = null; while(node != null) { prev = node; node = node.next; } prev.next = newNode; return this; } node newNode prev if (this.head == null) this.head = newNode; else {

5 Länge der Liste ermitteln public function length():int { var n:Node = this.head; var count:int = 0; while (n != null) { count++; n = n.next; } return count; }

6 Ein bestimmtes Element wählen public function nodeAt(index:int):Node { var n:Node = this.head; var count:int = 0; while (n != null && count != index) { count++; n = n.next; } return n; } public function search(value:int):Node { var n:Node = this.head; while (n != null) { if (n.value == value) return n; n = n.next; } return null; } head n index = 0index = 1index = 2 nodeAt(1); oder search(7);

7 Ein bestimmtes Element ändern public function setNodeAt(index:int, value:int):void { var n:Node = this.head; var count:int = 0; while (n != null) { if (count == index) { n.value = value; return; } count++; n = n.next; } head n index = 0index = 1index = 2 8 setNodeAt(1, 8);

8 Ein Element löschen public function deleteAt(index:int):List { var n:Node = this.head; var prev:Node = null; var count:int = 0; while (n != null) { if (count == index) { if (prev == null) this.head = n.next; else prev.next = n.next; return this; } count++; prev = n; n = n.next; } return this; } head n index = 0index = 1index = 2 deleteAt(1); index = 1 prev

9 Sortiert einfügen public function insertSorted(int value):List { var prev:Node = null; // previous node var node:Node = this.head; // current node while (node != null && node.value < value) { prev = node; node = node.next; } var n:Node = new Node(value, node); if (prev == null) this.head = n; else prev.next = n; return this; } head node insertSorted(3) prev 3 n

10 Gesamte Liste kopieren public static function clone(List l):List { var result:List = new List(); var n:Node = l.head; while (n != null) { result.append(n.value); n = n.next; } return result; } head n

11 Liste umdrehen public function reverse():void { var result:List = new List(); var n:Node = this.head; while (n != null) { result.prepend(n.value); n = n.next; } head = result.head; } head n


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