Merge pull request #10716 from KarthickSridhar/article_interface_vs_abstract_class

[ BAEL-4935 ] - Article - Interface vs Abstract Class in Java

core-java-modules/core-java-lang-oop-patterns/src/main/java/com/baeldung/interfacevsabstractclass/Car.java

@@ -0,0 +1,42 @@
+package com.baeldung.interfacevsabstractclass;
+
+public class Car extends Vehicle {
+
+    public Car(String vechicleName) {
+        super(vechicleName);
+    }
+
+    public Car(String vechicleName, String vehicleModel) {
+        super(vechicleName, vehicleModel);
+    }
+
+    public Car(String vechicleName, String vehicleModel, Long makeYear) {
+        super(vechicleName, vehicleModel, makeYear);
+    }
+
+    @Override
+    protected void start() {
+        // code implementation details on starting a car.
+    }
+
+    @Override
+    protected void stop() {
+        // code implementation details on stopping a car.
+    }
+
+    @Override
+    protected void drive() {
+        // code implementation details on start driving a car.
+    }
+
+    @Override
+    protected void changeGear() {
+        // code implementation details on changing the car gear.
+    }
+
+    @Override
+    protected void reverse() {
+        // code implementation details on reverse driving a car.
+    }
+
+}

core-java-modules/core-java-lang-oop-patterns/src/main/java/com/baeldung/interfacevsabstractclass/ImageSender.java

@@ -0,0 +1,12 @@
+package com.baeldung.interfacevsabstractclass;
+
+import java.io.File;
+
+public class ImageSender implements Sender {
+
+    @Override
+    public void send(File fileToBeSent) {
+        // image sending implementation code.
+    }
+
+}

core-java-modules/core-java-lang-oop-patterns/src/main/java/com/baeldung/interfacevsabstractclass/Sender.java

@@ -0,0 +1,8 @@
+package com.baeldung.interfacevsabstractclass;
+
+import java.io.File;
+
+public interface Sender {
+
+    void send(File fileToBeSent);
+}

core-java-modules/core-java-lang-oop-patterns/src/main/java/com/baeldung/interfacevsabstractclass/Vehicle.java

@@ -0,0 +1,57 @@
+package com.baeldung.interfacevsabstractclass;
+
+public abstract class Vehicle {
+
+    private String vehicleName;
+    private String vehicleModel;
+    private Long makeYear;
+
+    public Vehicle(String vehicleName) {
+        this.vehicleName = vehicleName;
+    }
+
+    public Vehicle(String vehicleName, String vehicleModel) {
+        this(vehicleName);
+        this.vehicleModel = vehicleModel;
+    }
+
+    public Vehicle(String vechicleName, String vehicleModel, Long makeYear) {
+        this(vechicleName, vehicleModel);
+        this.makeYear = makeYear;
+    }
+
+    public String getVehicleName() {
+        return vehicleName;
+    }
+
+    public void setVehicleName(String vehicleName) {
+        this.vehicleName = vehicleName;
+    }
+
+    public String getVehicleModel() {
+        return vehicleModel;
+    }
+
+    public void setVehicleModel(String vehicleModel) {
+        this.vehicleModel = vehicleModel;
+    }
+
+    public Long getMakeYear() {
+        return makeYear;
+    }
+
+    public void setMakeYear(Long makeYear) {
+        this.makeYear = makeYear;
+    }
+
+    protected abstract void start();
+
+    protected abstract void stop();
+
+    protected abstract void drive();
+
+    protected abstract void changeGear();
+
+    protected abstract void reverse();
+
+}

core-java-modules/core-java-lang-oop-patterns/src/main/java/com/baeldung/interfacevsabstractclass/VideoSender.java

@@ -0,0 +1,12 @@
+package com.baeldung.interfacevsabstractclass;
+
+import java.io.File;
+
+public class VideoSender implements Sender {
+
+    @Override
+    public void send(File fileToBeSent) {
+        // video sending implementation code
+    }
+
+}

core-java-modules/core-java-lang-oop-patterns/src/test/java/com/baeldung/interfacevsabstractclass/SenderUnitTest.java

@@ -0,0 +1,23 @@
+package com.baeldung.interfacevsabstractclass;
+
+import static org.junit.jupiter.api.Assertions.*;
+import org.junit.jupiter.api.Test;
+
+import com.baeldung.interfacevsabstractclass.ImageSender;
+import com.baeldung.interfacevsabstractclass.Sender;
+
+import java.io.File;
+
+class SenderUnitTest {
+
+    public final static String IMAGE_FILE_PATH = "/sample_image_file_path/photo.jpg";
+
+    @Test
+    void givenImageUploaded_whenButtonClicked_thenSendImage() {
+        File imageFile = new File(IMAGE_FILE_PATH);
+
+        Sender sender = new ImageSender();
+        sender.send(imageFile);
+    }
+
+}

core-java-modules/core-java-lang-oop-patterns/src/test/java/com/baeldung/interfacevsabstractclass/VehicleUnitTest.java

@@ -0,0 +1,22 @@
+package com.baeldung.interfacevsabstractclass;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import org.junit.jupiter.api.Test;
+
+import com.baeldung.interfacevsabstractclass.Car;
+import com.baeldung.interfacevsabstractclass.Vehicle;
+
+class VehicleUnitTest {
+
+    @Test
+    void givenVehicle_whenNeedToDrive_thenStart() {
+        Vehicle car = new Car("BMW");
+
+        car.start();
+        car.drive();
+        car.changeGear();
+        car.stop();
+    }
+
+}