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Trabalho L.P

Trabalho L.P sobre JAVA 8.0

Português Código
Classe para armazenar dados de pessoas <html> <body> public class Person { public enum Sex {<br /> MALE, FEMALE<br /> } String name; LocalDate birthday; Sex gender; String emailAddress;<br /> // ...<br /> public int getAge() {<br />
Lista e iterator interfaces. Primeiro, vamos olhar para a parte da interface List que é relevante para a implementação iteradores. <html> <body>template <class Item><br /> class List {<br /> public:<br /> List(long size =DEFAULT_LIST_CAPACITY);<br /> long Count() const;<br /> Item& Get(long index) const;<br /> // ...<br /> } </bod
percursos que definem uma classe Iterator abstrata, que define a interface iterator. <html> <body>template <class Item><br /> class Iterator {<br /> public:<br /> virtual void First() = 0;<br /> virtual void Next() = 0;<br /> virtual bool IsDone() const = 0;<br /> virtual Item CurrentItem() c
Implementações Iterator subclasse. ListIterator é uma subclasse de Iterator. <html> <body>template <class Item><br /> class ListIterator : public Iterator<Item> { public:<br /> ListIterator(const List<Item>* aList);<br /> virtual void First();<br /> virtual void Next();<br /> virtual
A implementação de ListIterator. Ele armazena a lista junto com um _current índice para a lista: <html> <body>template <class Item> ListIterator<Item>::ListIterator ( const List<Item>* aList ) : _list(aList), _current(0) { } </body> </html>
Isdone verifica se o índice se refere a um elemento dentro da lista: <html> <body>template <class Item> bool ListIterator<Item>::IsDone () const {<br /> return _current >= _list->Count();<br /> } </body> </html>
Finalmente, CurrentItem retorna o item no índice atual. Se a iteração já tenha terminado, então lançar uma exceção IteratorOutOfBounds: <html> <body>template <class Item> Item ListIterator<Item>::CurrentItem () const {<br /> if (IsDone()) {<br /> throw IteratorOutOfBounds;<br /> } return _list->Get(_current);<br /> } </body> </html>
Usando os iteradores. Vamos supor que temos uma lista de objetos dos empregados, e nós gostaríamos de imprimir todos os funcionários contidos. A classe Employee suporta isso com uma operação de impressão. Para imprimir a lista, nós definimos uma operação void PrintEmployees (Iterator<Employee*>& i) {<br /> for (i.First(); !i.IsDone(); i.Next()) {<br /> i.CurrentItem()->Print();<br /> } } </body> </html>
Uma vez que temos iterators tanto para back-to-frontal e travessias para frente e para trás, podemos reutilizar esta operação para imprimir os funcionários em ambas as ordens. <html> <body>List<Employee*>* employees;<br /> // ... ListIterator<Employee*> forward(employees);<br /> ReverseListIterator<Employee*> backward(employees);<br /> PrintEmployees(forward);<br /> PrintEmployees(backward);<br /
SkipListIterator está em conformidade com a interface Iterador, a operação PrintEmployees também pode ser utilizado quando os empregados são armazenadas em um objeto SkipList. <html> <body>SkipList<Employee*>* employees;<br /> // ... SkipListIterator<Employee*> iterator(employees);<br /> PrintEmployees(iterator);<br /> </body> </html>
Created by: danielferreiram
 

 



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