Merge pull request mouredev#6385 from martinbohorquez/java#29

#29 - java

Roadmap/29 - SOLID ISP/java/martinbohorquez.java

@@ -0,0 +1,158 @@
+/**
+ * #29 SOLID: PRINCIPIO DE SEGREGACIÓN DE INTERFACES (ISP)
+ *
+ * @author martinbohorquez
+ */
+public class martinbohorquez {
+    public static void main(String[] args) {
+        incorrectISP();
+        correctISP();
+        /*
+         * DIFICULTAD EXTRA
+         */
+        testPrinter();
+
+    }
+
+    private static void incorrectISP() {
+        Worker humano = new Humano();
+        humano.work();
+        humano.eat();
+        Worker maquina = new Machine();
+        maquina.work();
+        maquina.eat();//incorrecto: no se implementa el método "eat()", pero se obliga a definir.
+    }
+
+    private static void correctISP() {
+        Human human = new Human();
+        human.work();
+        human.eat();
+        Robot robot = new Robot();
+        robot.work();
+//        robot.eat();//correcto: no se implementa ni existe el método "eat()" para Robot.
+    }
+
+    private static void testPrinter() {
+        Printer printer = new PrinterImpl();
+        String document = "doc.pdf";
+        printer.print(document);
+        ColorPrinter colorPrinter = new ColorPrinterImpl();
+        colorPrinter.printColor(document);
+        Multifunction multifunctionPrinter = new Multifunction();
+        multifunctionPrinter.print(document);
+        multifunctionPrinter.printColor(document);
+        multifunctionPrinter.scan(document);
+        multifunctionPrinter.sendFax(document);
+    }
+}
+
+interface Worker {
+    void work();
+
+    void eat();
+}
+
+class Humano implements Worker {
+    @Override
+    public void work() {
+        System.out.println("Trabajando!");
+    }
+
+    @Override
+    public void eat() {
+        System.out.println("Comiendo!");
+    }
+}
+
+class Machine implements Worker {
+    @Override
+    public void work() {
+        System.out.println("Trabajando!");
+    }
+
+    @Override
+    public void eat() {
+        // Robot no comen
+    }
+}
+
+interface Work {
+    void work();
+}
+
+interface Eat {
+    void eat();
+}
+
+class Human implements Work, Eat {
+    @Override
+    public void work() {
+        System.out.println("Trabajando!");
+    }
+
+    @Override
+    public void eat() {
+        System.out.println("Comiendo!");
+    }
+}
+
+class Robot implements Work {
+    @Override
+    public void work() {
+        System.out.println("Trabajando!");
+    }
+}
+
+interface Printer {
+    void print(String document);
+}
+
+interface ColorPrinter {
+    void printColor(String document);
+}
+
+interface Scanner {
+    String scan(String document);
+}
+
+interface Fax {
+    void sendFax(String document);
+}
+
+class PrinterImpl implements Printer {
+    @Override
+    public void print(String document) {
+        System.out.printf("Imprimiendo en blanco y negro el documento '%s'%n", document);
+    }
+}
+
+class ColorPrinterImpl implements ColorPrinter {
+    @Override
+    public void printColor(String document) {
+        System.out.printf("Imprimiendo a color el documento '%s'%n", document);
+    }
+}
+
+class Multifunction implements Printer, ColorPrinter, Scanner, Fax {
+
+    @Override
+    public void print(String document) {
+        System.out.printf("Imprimiendo en blanco y negro el documento '%s'%n", document);
+    }
+
+    @Override
+    public void printColor(String document) {
+        System.out.printf("Imprimiendo a color el documento '%s'%n", document);
+    }
+
+    @Override
+    public String scan(String document) {
+        System.out.printf("Escaneando el documento '%s'%n", document);
+        return "Documento " + document + " escaneado.";
+    }
+
+    @Override
+    public void sendFax(String document) {
+        System.out.printf("Enviando por fax el documento '%s'%n", document);
+    }
+}