Patron Dependency Injection

src/main/java/org/example/designpatterns/dependencyinjection/App.java

+package org.example.designpatterns.dependencyinjection;
+
+import org.example.designpatterns.dependencyinjection.dao.*;
+
+public class App {
+    public static void main(String[] args) {
+        IConnection cx1 = new ConnectionMySQL("jponte", "7482", "localhost");
+        IConnection cx2 = new ConnectionPostgreSQL("jponte", "7482", "192.168.1.1");
+
+        IPersonaDAO dao1 = new PersonaDAOImpl();
+        dao1.setConnection(cx1);
+        dao1.listarTodos();
+
+        IPersonaDAO dao2= new PersonaDAOImpl();
+        dao2.setConnection(cx2);
+        dao2.listarTodos();
+    }
+}

src/main/java/org/example/designpatterns/dependencyinjection/dao/ConnectionMySQL.java

+package org.example.designpatterns.dependencyinjection.dao;
+
+public class ConnectionMySQL implements IConnection {
+    private String usuario;
+    private String clave;
+    private String host;
+
+    public ConnectionMySQL(String usuario, String clave, String host) {
+        this.usuario = usuario;
+        this.clave = clave;
+        this.host = host;
+    }
+
+    @Override
+    public void conectar() {
+        System.out.println("Conectando con MySQL...");
+    }
+}

src/main/java/org/example/designpatterns/dependencyinjection/dao/ConnectionPostgreSQL.java

+package org.example.designpatterns.dependencyinjection.dao;
+
+public class ConnectionPostgreSQL implements IConnection {
+    private String usuario;
+    private String clave;
+    private String host;
+
+    public ConnectionPostgreSQL(String usuario, String clave, String host) {
+        this.usuario = usuario;
+        this.clave = clave;
+        this.host = host;
+    }
+
+    @Override
+    public void conectar() {
+        System.out.println("Conectando con PostgreSQL...");
+    }
+}

src/main/java/org/example/designpatterns/dependencyinjection/dao/ICRUD.java

+package org.example.designpatterns.dependencyinjection.dao;
+
+import java.util.List;
+
+public interface ICRUD<T> {
+
+    List<T> listarTodos();
+    T leerPorId(int id);
+    void registrar(T persona);
+    void actualizar(T persona);
+    void eliminar(int id);
+}

src/main/java/org/example/designpatterns/dependencyinjection/dao/IConnection.java

+package org.example.designpatterns.dependencyinjection.dao;
+
+public interface IConnection {
+
+    void conectar();
+}

src/main/java/org/example/designpatterns/dependencyinjection/dao/IPersonaDAO.java

+package org.example.designpatterns.dependencyinjection.dao;
+
+import org.example.designpatterns.dependencyinjection.model.Persona;
+
+
+public interface IPersonaDAO extends ICRUD<Persona> {
+    void mostrarNombre(Persona persona);
+    void setConnection(IConnection connection);
+}

src/main/java/org/example/designpatterns/dependencyinjection/dao/PersonaDAOImpl.java

+package org.example.designpatterns.dependencyinjection.dao;
+
+import org.example.designpatterns.dependencyinjection.model.Persona;
+
+import java.util.List;
+
+public class PersonaDAOImpl implements IPersonaDAO {
+
+    private IConnection connection;
+
+    /*public PersonaDAOImpl(IConnection connection) {
+        this.connection = connection;
+    }*/
+
+    public void setConnection(IConnection connection) {
+        this.connection = connection;
+    }
+
+    @Override
+    public List<Persona> listarTodos() {
+        this.connection.conectar();
+        System.out.println("Listando.....");
+
+        return null;
+    }
+
+    @Override
+    public Persona leerPorId(int id) {
+        return null;
+    }
+
+    @Override
+    public void registrar(Persona persona) {
+        System.out.println("Persona " + persona.getNombres() + " registrada");
+    }
+
+    @Override
+    public void actualizar(Persona persona) {
+        System.out.println("Persona " + persona.getNombres() + " actualizada");
+    }
+
+    @Override
+    public void eliminar(int id) {
+        System.out.println("id " + id + " eliminado");
+    }
+
+    @Override
+    public void mostrarNombre(Persona per) {
+        System.out.println("Los nombres de la persona son : " + per.getNombres());
+    }
+}

src/main/java/org/example/designpatterns/dependencyinjection/model/Persona.java

+package org.example.designpatterns.dependencyinjection.model;
+
+public class Persona {
+    private int id;
+    private String nombres;
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+    public String getNombres() {
+        return nombres;
+    }
+
+    public void setNombres(String nombres) {
+        this.nombres = nombres;
+    }
+}