update polymorphism example

src/encapsulationInheritancePolymorphism/polymorphism/ElectricEngine.java

@@ -3,6 +3,7 @@ package encapsulationInheritancePolymorphism.polymorphism;
 public class ElectricEngine extends Engine {
     private String batteryType;
 
+    @Override
     public int getPower() {
         return 20;
     }

src/encapsulationInheritancePolymorphism/polymorphism/FuelEngine.java

@@ -3,6 +3,7 @@ package encapsulationInheritancePolymorphism.polymorphism;
 public class FuelEngine extends Engine {
     private String fuelType;
 
+    @Override
     public int getPower() {
         return 50;
     }

src/encapsulationInheritancePolymorphism/polymorphism/Main.java

@@ -22,5 +22,17 @@ public class Main {
         /*for (int i = 0; i < engines.length; i++) {
             System.out.println(engines[i].getPower());
         }*/
+
+//        +
+        int a = 1;
+        int b = 1;
+        int c = a + b;
+        System.out.println(c);
+
+
+        String sA = "1";
+        String sB = "1";
+        String sC = sA + sB;
+        System.out.println(sC);
     }
 }

src/encapsulationInheritancePolymorphism/polymorphism/overload/MyClassForOverloadExample.java

@@ -0,0 +1,17 @@
+package encapsulationInheritancePolymorphism.polymorphism.overload;
+
+public class MyClassForOverloadExample {
+    void myMethod(int a) {
+        System.out.println("Integer: " + a);
+    }
+
+    void myMethod(double a) {
+        System.out.println("Double: " + a);
+    }
+
+    public static void main(String[] args) {
+        MyClassForOverloadExample overload = new MyClassForOverloadExample();
+        overload.myMethod(1);
+        overload.myMethod(0.1);
+    }
+}