diff --git a/core-java/src/main/java/com/baeldung/methodoverloadingoverriding/application/Application.java b/core-java/src/main/java/com/baeldung/methodoverloadingoverriding/application/Application.java
new file mode 100644
index 0000000000..6e023e9fa8
--- /dev/null
+++ b/core-java/src/main/java/com/baeldung/methodoverloadingoverriding/application/Application.java
@@ -0,0 +1,26 @@
+package com.baeldung.methodoverloadingoverriding.application;
+
+import com.baeldung.methodoverloadingoverriding.model.Car;
+import com.baeldung.methodoverloadingoverriding.model.Vehicle;
+import com.baeldung.methodoverloadingoverriding.util.Multiplier;
+
+public class Application {
+    
+    public static void main(String[] args) {
+        Multiplier multiplier = new Multiplier();
+        System.out.println(multiplier.multiply(10, 10));
+        System.out.println(multiplier.multiply(10, 10, 10));
+        System.out.println(multiplier.multiply(10, 10.5));
+        System.out.println(multiplier.multiply(10.5, 10.5));
+        
+        Vehicle vehicle = new Vehicle();
+        System.out.println(vehicle.accelerate(100));
+        System.out.println(vehicle.run());
+        System.out.println(vehicle.stop());
+        
+        Vehicle car = new Car();
+        System.out.println(car.accelerate(80));
+        System.out.println(car.run());
+        System.out.println(car.stop());
+    }
+}
diff --git a/core-java/src/main/java/com/baeldung/methodoverloadingoverriding/model/Car.java b/core-java/src/main/java/com/baeldung/methodoverloadingoverriding/model/Car.java
new file mode 100644
index 0000000000..aa5bdcaec9
--- /dev/null
+++ b/core-java/src/main/java/com/baeldung/methodoverloadingoverriding/model/Car.java
@@ -0,0 +1,9 @@
+package com.baeldung.methodoverloadingoverriding.model;
+
+public class Car extends Vehicle {
+
+    @Override
+    public String accelerate(long mph) {
+        return "The car accelerates at : " + mph + " MPH.";
+    }
+}
diff --git a/core-java/src/main/java/com/baeldung/methodoverloadingoverriding/model/Vehicle.java b/core-java/src/main/java/com/baeldung/methodoverloadingoverriding/model/Vehicle.java
new file mode 100644
index 0000000000..eb59e8ca23
--- /dev/null
+++ b/core-java/src/main/java/com/baeldung/methodoverloadingoverriding/model/Vehicle.java
@@ -0,0 +1,16 @@
+package com.baeldung.methodoverloadingoverriding.model;
+
+public class Vehicle {
+    
+    public String accelerate(long mph) {
+        return "The vehicle accelerates at : " + mph + " MPH.";
+    }
+    
+    public String stop() {
+        return "The vehicle has stopped.";
+    }
+    
+    public String run() {
+        return "The vehicle is running.";
+    }
+}
diff --git a/core-java/src/main/java/com/baeldung/methodoverloadingoverriding/util/Multiplier.java b/core-java/src/main/java/com/baeldung/methodoverloadingoverriding/util/Multiplier.java
new file mode 100644
index 0000000000..c43e61c78f
--- /dev/null
+++ b/core-java/src/main/java/com/baeldung/methodoverloadingoverriding/util/Multiplier.java
@@ -0,0 +1,16 @@
+package com.baeldung.methodoverloadingoverriding.util;
+
+public class Multiplier {
+    
+    public int multiply(int a, int b) {
+        return a * b;
+    }
+    
+    public int multiply(int a, int b, int c) {
+        return a * b * c;
+    }
+    
+    public double multiply(double a, double b) {
+        return a * b;
+    }
+}
diff --git a/core-java/src/test/java/com/baeldung/methodoverloadingoverriding/test/MethodOverloadingUnitTest.java b/core-java/src/test/java/com/baeldung/methodoverloadingoverriding/test/MethodOverloadingUnitTest.java
new file mode 100644
index 0000000000..081a30c34a
--- /dev/null
+++ b/core-java/src/test/java/com/baeldung/methodoverloadingoverriding/test/MethodOverloadingUnitTest.java
@@ -0,0 +1,41 @@
+package com.baeldung.methodoverloadingoverriding.test;
+
+import com.baeldung.methodoverloadingoverriding.util.Multiplier;
+import org.junit.BeforeClass;
+import org.junit.Test;
+import static org.assertj.core.api.Assertions.*;
+
+public class MethodOverloadingUnitTest {
+    
+    private static Multiplier multiplier;
+    
+    @BeforeClass
+    public static void setUpMultiplierInstance() {
+        multiplier = new Multiplier();
+    }
+ 
+    @Test
+    public void givenMultiplierInstance_whenCalledMultiplyWithTwoIntegers_thenOneAssertion() {
+        assertThat(multiplier.multiply(10, 10)).isEqualTo(100);
+    }
+    
+    @Test
+    public void givenMultiplierInstance_whenCalledMultiplyWithTreeIntegers_thenOneAssertion() {
+        assertThat(multiplier.multiply(10, 10, 10)).isEqualTo(1000);
+    }
+    
+    @Test
+    public void givenMultiplierInstance_whenCalledMultiplyWithIntDouble_thenOneAssertion() {
+        assertThat(multiplier.multiply(10, 10.5)).isEqualTo(105.0);
+    }
+    
+    @Test
+    public void givenMultiplierInstance_whenCalledMultiplyWithDoubleDouble_thenOneAssertion() {
+        assertThat(multiplier.multiply(10.5, 10.5)).isEqualTo(110.25);
+    }
+    
+    @Test
+    public void givenMultiplierInstance_whenCalledMultiplyWithIntIntAndMatching_thenNoTypePromotion() {
+        assertThat(multiplier.multiply(10, 10)).isEqualTo(100);
+    }
+}
diff --git a/core-java/src/test/java/com/baeldung/methodoverloadingoverriding/test/MethodOverridingUnitTest.java b/core-java/src/test/java/com/baeldung/methodoverloadingoverriding/test/MethodOverridingUnitTest.java
new file mode 100644
index 0000000000..554ac121bc
--- /dev/null
+++ b/core-java/src/test/java/com/baeldung/methodoverloadingoverriding/test/MethodOverridingUnitTest.java
@@ -0,0 +1,68 @@
+package com.baeldung.methodoverloadingoverriding.test;
+
+import com.baeldung.methodoverloadingoverriding.model.Car;
+import com.baeldung.methodoverloadingoverriding.model.Vehicle;
+import org.junit.BeforeClass;
+import org.junit.Test;
+import static org.assertj.core.api.Assertions.*;
+
+public class MethodOverridingUnitTest {
+    
+    private static Vehicle vehicle;
+    private static Car car;
+    
+    @BeforeClass
+    public static void setUpVehicleInstance() {
+        vehicle = new Vehicle();
+    }
+    
+    @BeforeClass
+    public static void setUpCarInstance() {
+        car = new Car();
+    }
+    
+    @Test
+    public void givenVehicleInstance_whenCalledAccelerate_thenOneAssertion() {
+        assertThat(vehicle.accelerate(100)).isEqualTo("The vehicle accelerates at : 100 MPH.");
+    }
+    
+    @Test
+    public void givenVehicleInstance_whenCalledRun_thenOneAssertion() {
+        assertThat(vehicle.run()).isEqualTo("The vehicle is running.");
+    }
+    
+    @Test
+    public void givenVehicleInstance_whenCalledStop_thenOneAssertion() {
+        assertThat(vehicle.stop()).isEqualTo("The vehicle has stopped.");
+    }
+    
+    @Test
+    public void givenCarInstance_whenCalledAccelerate_thenOneAssertion() {
+        assertThat(car.accelerate(80)).isEqualTo("The car accelerates at : 80 MPH.");
+    }
+    
+    @Test
+    public void givenCarInstance_whenCalledRun_thenOneAssertion() {
+        assertThat(car.run()).isEqualTo("The vehicle is running.");
+    }
+    
+    @Test
+    public void givenCarInstance_whenCalledStop_thenOneAssertion() {
+        assertThat(car.stop()).isEqualTo("The vehicle has stopped.");
+    }
+    
+    @Test
+    public void givenVehicleCarInstances_whenCalledAccelerateWithSameArgument_thenNotEqual() {
+        assertThat(vehicle.accelerate(100)).isNotEqualTo(car.accelerate(100));
+    }
+    
+    @Test
+    public void givenVehicleCarInstances_whenCalledRun_thenEqual() {
+        assertThat(vehicle.run()).isEqualTo(car.run());
+    }
+    
+    @Test
+    public void givenVehicleCarInstances_whenCalledStop_thenEqual() {
+        assertThat(vehicle.stop()).isEqualTo(car.stop());
+    }
+}