From 429bcc7b3d9fb2d5a1e234ce2e3935af0496a0bf Mon Sep 17 00:00:00 2001
From: Oleksii Aleshchenko <alexey.aleshchenko@gmail.com>
Date: Thu, 2 Mar 2023 15:26:42 +0200
Subject: [PATCH] add polymorphism example

---
 .../polymorphism/ElectricEngine.java          | 13 +++++++++
 .../polymorphism/Engine.java                  |  9 ++++++
 .../polymorphism/FuelEngine.java              |  9 ++++++
 .../polymorphism/Main.java                    | 26 +++++++++++++++++
 .../polymorphism/enhanced/ElectricEngine.java | 19 +++++++++++++
 .../polymorphism/enhanced/Engine.java         |  9 ++++++
 .../polymorphism/enhanced/FuelEngine.java     | 10 +++++++
 .../polymorphism/enhanced/Main.java           | 28 +++++++++++++++++++
 8 files changed, 123 insertions(+)
 create mode 100644 src/encapsulationInheritancePolymorphism/polymorphism/ElectricEngine.java
 create mode 100644 src/encapsulationInheritancePolymorphism/polymorphism/Engine.java
 create mode 100644 src/encapsulationInheritancePolymorphism/polymorphism/FuelEngine.java
 create mode 100644 src/encapsulationInheritancePolymorphism/polymorphism/Main.java
 create mode 100644 src/encapsulationInheritancePolymorphism/polymorphism/enhanced/ElectricEngine.java
 create mode 100644 src/encapsulationInheritancePolymorphism/polymorphism/enhanced/Engine.java
 create mode 100644 src/encapsulationInheritancePolymorphism/polymorphism/enhanced/FuelEngine.java
 create mode 100644 src/encapsulationInheritancePolymorphism/polymorphism/enhanced/Main.java

diff --git a/src/encapsulationInheritancePolymorphism/polymorphism/ElectricEngine.java b/src/encapsulationInheritancePolymorphism/polymorphism/ElectricEngine.java
new file mode 100644
index 0000000..17341fd
--- /dev/null
+++ b/src/encapsulationInheritancePolymorphism/polymorphism/ElectricEngine.java
@@ -0,0 +1,13 @@
+package encapsulationInheritancePolymorphism.polymorphism;
+
+public class ElectricEngine extends Engine {
+    private String batteryType;
+
+    public int getPower() {
+        return 20;
+    }
+
+    /*private class Engine {
+        private int power;
+    }*/
+}
diff --git a/src/encapsulationInheritancePolymorphism/polymorphism/Engine.java b/src/encapsulationInheritancePolymorphism/polymorphism/Engine.java
new file mode 100644
index 0000000..074855b
--- /dev/null
+++ b/src/encapsulationInheritancePolymorphism/polymorphism/Engine.java
@@ -0,0 +1,9 @@
+package encapsulationInheritancePolymorphism.polymorphism;
+
+public class Engine {
+    private int power;
+
+    public int getPower() {
+        return power;
+    }
+}
diff --git a/src/encapsulationInheritancePolymorphism/polymorphism/FuelEngine.java b/src/encapsulationInheritancePolymorphism/polymorphism/FuelEngine.java
new file mode 100644
index 0000000..e31177e
--- /dev/null
+++ b/src/encapsulationInheritancePolymorphism/polymorphism/FuelEngine.java
@@ -0,0 +1,9 @@
+package encapsulationInheritancePolymorphism.polymorphism;
+
+public class FuelEngine extends Engine {
+    private String fuelType;
+
+    public int getPower() {
+        return 50;
+    }
+}
diff --git a/src/encapsulationInheritancePolymorphism/polymorphism/Main.java b/src/encapsulationInheritancePolymorphism/polymorphism/Main.java
new file mode 100644
index 0000000..a9ec705
--- /dev/null
+++ b/src/encapsulationInheritancePolymorphism/polymorphism/Main.java
@@ -0,0 +1,26 @@
+package encapsulationInheritancePolymorphism.polymorphism;
+
+/*import encapsulationInheritancePolymorphism.inheritance.ElectricEngine;
+import encapsulationInheritancePolymorphism.inheritance.FuelEngine;*/
+
+public class Main {
+    public static void main(String[] args) {
+        /*encapsulationInheritancePolymorphism.inheritance.*/ElectricEngine electricEngine = new ElectricEngine(); // створення нового об'єкту (екземпляру) класу ElectricEngine
+        /*encapsulationInheritancePolymorphism.inheritance.*/FuelEngine fuelEngine = new FuelEngine();
+
+        Engine engine1 = fuelEngine;
+
+        Engine[] engines = {
+                electricEngine,
+                fuelEngine
+        };
+
+        for (Engine engine : engines) {
+            System.out.println(engine.getPower());
+        }
+
+        /*for (int i = 0; i < engines.length; i++) {
+            System.out.println(engines[i].getPower());
+        }*/
+    }
+}
diff --git a/src/encapsulationInheritancePolymorphism/polymorphism/enhanced/ElectricEngine.java b/src/encapsulationInheritancePolymorphism/polymorphism/enhanced/ElectricEngine.java
new file mode 100644
index 0000000..1d6db51
--- /dev/null
+++ b/src/encapsulationInheritancePolymorphism/polymorphism/enhanced/ElectricEngine.java
@@ -0,0 +1,19 @@
+package encapsulationInheritancePolymorphism.polymorphism.enhanced;
+
+public class ElectricEngine extends Engine {
+    private String batteryType;
+    private int chargeLevel = 9;
+    private int criticalChargeLevel = 10;
+    private float coefficientCriticalPowerCut = 0.1f;
+
+    @Override
+    public int getPower() {
+        return chargeLevel > criticalChargeLevel
+                ? super.getPower()
+                : (int) (super.getPower() * coefficientCriticalPowerCut);
+    }
+
+    /*private class Engine {
+        private int power;
+    }*/
+}
diff --git a/src/encapsulationInheritancePolymorphism/polymorphism/enhanced/Engine.java b/src/encapsulationInheritancePolymorphism/polymorphism/enhanced/Engine.java
new file mode 100644
index 0000000..310f9ce
--- /dev/null
+++ b/src/encapsulationInheritancePolymorphism/polymorphism/enhanced/Engine.java
@@ -0,0 +1,9 @@
+package encapsulationInheritancePolymorphism.polymorphism.enhanced;
+
+public class Engine {
+    private int power = 100;
+
+    public int getPower() {
+        return power;
+    }
+}
diff --git a/src/encapsulationInheritancePolymorphism/polymorphism/enhanced/FuelEngine.java b/src/encapsulationInheritancePolymorphism/polymorphism/enhanced/FuelEngine.java
new file mode 100644
index 0000000..ad07d84
--- /dev/null
+++ b/src/encapsulationInheritancePolymorphism/polymorphism/enhanced/FuelEngine.java
@@ -0,0 +1,10 @@
+package encapsulationInheritancePolymorphism.polymorphism.enhanced;
+
+public class FuelEngine extends Engine {
+    private String fuelType;
+
+    /*public int getPower() {
+        return 50;
+    }*/
+
+}
diff --git a/src/encapsulationInheritancePolymorphism/polymorphism/enhanced/Main.java b/src/encapsulationInheritancePolymorphism/polymorphism/enhanced/Main.java
new file mode 100644
index 0000000..dcec9b1
--- /dev/null
+++ b/src/encapsulationInheritancePolymorphism/polymorphism/enhanced/Main.java
@@ -0,0 +1,28 @@
+package encapsulationInheritancePolymorphism.polymorphism.enhanced;
+
+/*import encapsulationInheritancePolymorphism.inheritance.ElectricEngine;
+import encapsulationInheritancePolymorphism.inheritance.FuelEngine;*/
+
+public class Main {
+    public static void main(String[] args) {
+        /*encapsulationInheritancePolymorphism.inheritance.*/
+        ElectricEngine electricEngine = new ElectricEngine(); // створення нового об'єкту (екземпляру) класу ElectricEngine
+        /*encapsulationInheritancePolymorphism.inheritance.*/
+        FuelEngine fuelEngine = new FuelEngine();
+
+        Engine engine1 = fuelEngine;
+
+        Engine[] engines = {
+                electricEngine,
+                fuelEngine
+        };
+
+        for (Engine engine : engines) {
+            System.out.println(engine.getPower());
+        }
+
+        /*for (int i = 0; i < engines.length; i++) {
+            System.out.println(engines[i].getPower());
+        }*/
+    }
+}