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Merge pull request mouredev#6201 from simonguzman/main
#28 - Java
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‎Roadmap/28 - SOLID LSP/java/simonguzman.java‎

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import java.util.ArrayList;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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public class simonguzman {
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public static void main(String[] args) {
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//libraryManagementSystemLiskovViolation();
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//libraryLSP();
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//LiskovIncorrectTest();
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LiskovCorrectTest();
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}
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/****************************** ejercicio adicional con lsp (Correcto) ******************************/
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public static void LiskovCorrectTest() {
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VehiculoLsp coche = new Coche();
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VehiculoLsp bicicleta = new Bicicleta();
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VehiculoLsp motocicleta = new Motocicleta();
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// Probar comportamiento de los vehículos
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acelerarYFrenarLsp(coche);
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acelerarYFrenarLsp(bicicleta);
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acelerarYFrenarLsp(motocicleta);
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}
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public static void acelerarYFrenarLsp(VehiculoLsp vehiculo) {
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vehiculo.acelerar();
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vehiculo.frenar();
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}
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static class VehiculoLsp {
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public void acelerar() {
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System.out.println("El vehículo está acelerando.");
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}
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public void frenar() {
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System.out.println("El vehículo está frenando.");
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}
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}
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static class Coche extends VehiculoLsp {
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@Override
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public void acelerar() {
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System.out.println("El coche está acelerando rápidamente.");
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}
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@Override
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public void frenar() {
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System.out.println("El coche está frenando suavemente.");
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}
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}
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static class Bicicleta extends VehiculoLsp {
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@Override
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public void acelerar() {
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System.out.println("La bicicleta está acelerando lentamente.");
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}
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@Override
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public void frenar() {
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System.out.println("La bicicleta está frenando manualmente.");
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}
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}
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static class Motocicleta extends VehiculoLsp {
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@Override
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public void acelerar() {
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System.out.println("La motocicleta está acelerando con potencia.");
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}
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@Override
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public void frenar() {
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System.out.println("La motocicleta está frenando rápidamente.");
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}
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}
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/****************************** ejercicio adicional sin lsp (Incorrecto) ******************************/
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public static void LiskovIncorrectTest() {
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Vehiculo cocheElectrico = new CocheElectrico();
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acelerarYFrenar(cocheElectrico);
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((CocheElectrico) cocheElectrico).recargarBateria();
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}
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public static void acelerarYFrenar(Vehiculo vehiculo) {
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vehiculo.acelerar();
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vehiculo.frenar();
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}
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static class Vehiculo {
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public void acelerar() {
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System.out.println("El vehículo está acelerando.");
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}
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public void frenar() {
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System.out.println("El vehículo está frenando.");
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}
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}
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// Subclase CocheEléctrico que viola LSP
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static class CocheElectrico extends Vehiculo {
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@Override
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public void acelerar() {
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System.out.println("El coche eléctrico está acelerando silenciosamente.");
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}
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@Override
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public void frenar() {
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System.out.println("El coche eléctrico está frenando regenerativamente.");
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}
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// Método adicional que viola el LSP
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public void recargarBateria() {
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System.out.println("Recargando la batería del coche eléctrico.");
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}
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}
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/****************************** ejemplo con lsp (Correcto) ******************************/
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static void libraryLSP(){
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LibraryManager libraryManager = new LibraryManager();
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UserManager userManager = new UserManager();
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LoanManagerLsp loanManager = new LoanManagerLsp();
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libraryManager.registerBook(new PhysicalBook("1984", "George Orwell", 3));
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libraryManager.registerBook(new EBookLsp("Clean Code", "Robert Martin"));
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userManager.registerUser("John Doe", "001", "johndoe@example.com");
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User user = userManager.findUserById("001");
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BookLsp book1 = libraryManager.findBookByTitle("1984");
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BookLsp book2 = libraryManager.findBookByTitle("Clean Code");
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loanManager.borrowBook(user, book1);
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loanManager.borrowBook(user, book2);
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loanManager.returnBook(user, book1);
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loanManager.returnBook(user, book2);
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}
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static abstract class BookLsp{
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protected String title;
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protected String author;
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public BookLsp(){
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}
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public BookLsp(String title, String author){
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this.title = title;
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this.author = author;
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}
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public String getTitle() {
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return title;
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}
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public abstract boolean isAvailable();
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public abstract void borrow();
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public abstract void returnBook();
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}
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static class PhysicalBook extends BookLsp{
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private int copies;
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public PhysicalBook(){
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}
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public PhysicalBook(String title, String author, int copies){
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super(title, author);
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this.copies = copies;
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}
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@Override
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public boolean isAvailable(){
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return copies > 0;
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}
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@Override
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public void borrow(){
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if(copies > 0){
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copies--;
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}
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}
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@Override
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public void returnBook(){
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copies++;
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}
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}
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static class EBookLsp extends BookLsp {
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public EBookLsp(String title, String author) {
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super(title, author);
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}
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@Override
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public boolean isAvailable() {
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return true; // Siempre disponible
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}
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@Override
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public void borrow() {
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System.out.println("Descargando eBook...");
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}
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@Override
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public void returnBook() {
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System.out.println("El eBook ha sido devuelto.");
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}
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}
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static class LibraryManager{
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private List<BookLsp> books = new ArrayList<>();
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public void registerBook(BookLsp book){
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books.add(book);
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System.out.println("Libro registrado: " + book.getTitle());
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}
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public BookLsp findBookByTitle(String title){
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return books.stream().filter(b -> b.getTitle().equals(title)).findFirst().orElse(null);
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}
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}
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static class UserManager{
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private List<User> users = new ArrayList<>();
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public void registerUser(String name, String id, String email){
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users.add(new User(name, id, email));
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System.out.println("Usuario registrado: " + name);
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}
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public User findUserById(String id){
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return users.stream().filter(u -> u.getId().equals(id)).findFirst().orElse(null);
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}
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}
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static class LoanManagerLsp{
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private Map<User, List<BookLsp>> borrowedBooks = new HashMap<>();
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public void borrowBook(User user, BookLsp book){
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if(book.isAvailable()){
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borrowedBooks.computeIfAbsent(user, k -> new ArrayList<>()).add(book);
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book.borrow();
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System.out.println("Libro prestado: " + book.getTitle() + " a " + user.getName());
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} else {
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System.out.println("El libro no está disponible para préstamo.");
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}
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}
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public void returnBook(User user, BookLsp book) {
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List<BookLsp> borrowed = borrowedBooks.get(user);
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if (borrowed != null && borrowed.contains(book)) {
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borrowed.remove(book);
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book.returnBook();
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System.out.println("Libro devuelto: " + book.getTitle());
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} else {
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System.out.println("No se pudo devolver el libro.");
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}
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}
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}
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static class User{
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private String name;
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private String id;
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private String email;
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public User(){
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}
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public User(String name, String id, String email){
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this.name = name;
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this.id = id;
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this.email = email;
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}
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public String getName() {
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return name;
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}
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public String getId() {
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return id;
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}
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}
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/****************************** ejemplo sin lsp (Incorrecto) ******************************/
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public static void libraryManagementSystemLiskovViolation(){
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Book physicalBook = new Book("1984", "George Orwell", 3);
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EBook ebook = new EBook("Digital Fortress", "Dan Brown", "www.download.com");
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LoanManager loanManager = new LoanManager();
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loanManager.borrowBook(physicalBook);
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loanManager.borrowBook(ebook);
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}
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static class Book{
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private String title;
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private String author;
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private int copies;
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public Book(){
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}
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public Book(String title, String author, int copies){
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this.title = title;
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this.author = author;
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this.copies = copies;
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}
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public String getTitle() {
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return title;
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}
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public int getCopies() {
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return copies;
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}
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public void setCopies(int copies) {
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this.copies = copies;
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}
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public void borrow(){
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if (copies > 0){
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copies--;
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System.out.println("Libro prestado: " + title);
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} else {
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System.out.println("No hay copias disponibles de: " + title);
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}
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}
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}
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static class EBook extends Book {
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private String downloadLink;
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public EBook(String title, String author,String downloadLink) {
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super(title, author, 1);
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this.downloadLink = downloadLink;
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}
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@Override
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public void borrow(){
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System.out.println("No se puede prestar el eBook, pero puedes descargarlo aquí: " + downloadLink);
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}
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}
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static class LoanManager{
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public void borrowBook(Book book){
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book.borrow();
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}
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}
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}

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