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Do tasks and learn OOP concepts like Interfaces, Inheritance, Polymorphism, and Abstraction. #4

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faraz_ardeh wants to merge 1 commits from faraz_ardeh/WS-03-advanced-oop:develop into master
pull from: faraz_ardeh/WS-03-advanced-oop:develop
merge into: :master
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8 changed files with 217 additions and 138 deletions
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src/main/java/org/Main.java
+51 -96
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@@ -1,126 +1,81 @@
package org;
import org.behavior.Serviceable;
import org.model.*;
import org.util.VehicleInspector;
public class Main {
public static void main(String[] args) {
// ============================================================
// TODO 1:
// Create one instance of each vehicle type:
// - ElectricCar
// - GasCar
// - SportsCar
//
// Requirements:
// • Use the constructors you created in each class.
// • Provide realistic values (brand, model, year, mileage, etc.).
// • Store them in variables such as:
// ElectricCar tesla = new ElectricCar(...);
// TODO 1: Create vehicle instances
// ============================================================
ElectricCar tesla = new ElectricCar(
"Tesla", "Model S", 2022, 1000,
5, 100, 75
);
GasCar toyota = new GasCar(
"Toyota", "Corolla", 2018, 85000,
5, 50, "Petrol"
);
SportsCar ferrari = new SportsCar(
"Ferrari", "F8 Tributo", 2021, 12000,
2, 60, "Premium", 2.9
);
HybridCar prius = new HybridCar(
"Toyota", "Prius", 2023, 15000,
5, 40, 60
);
// ============================================================
// TODO 2:
// Create an array of Vehicle:
// Vehicle[] vehicles = { ... };
//
// This array MUST contain the objects created above.
// This demonstrates **polymorphism** because all different
// subclasses (ElectricCar, GasCar, SportsCar) are stored
// as their parent type (Vehicle).
// TODO 2: Create array of Vehicle (polymorphism)
// ============================================================
Vehicle[] vehicles = { tesla, toyota, ferrari, prius };
// ============================================================
// TODO 3:
// Loop through the Vehicle[] array and:
// • Call v.basicInfo();
// • Print a blank line after each.
//
// Purpose:
// Demonstrate that all subclasses share the same Vehicle
// behavior and can call inherited methods.
// TODO 3: Loop through vehicles and print basic info
// ============================================================
System.out.println("=== Vehicle Basic Info ===");
for (Vehicle v : vehicles) {
v.basicInfo();
System.out.println();
}
// ============================================================
// TODO 4:
// Use VehicleInspector to inspect each vehicle:
//
// VehicleInspector.inspect(v);
//
// Purpose:
// • Demonstrate the use of `instanceof`
// • Show subclass‑specific inspection messages
// TODO 4: Inspect each vehicle using VehicleInspector
// ============================================================
System.out.println("=== Vehicle Inspection ===");
for (Vehicle v : vehicles) {
VehicleInspector.inspect(v);
System.out.println();
}
// ============================================================
// TODO 5:
// Create an array of Serviceable:
// Serviceable[] serviceables = { ... };
//
// This demonstrates **interface‑based polymorphism**.
// Every Car subtype implements Serviceable.
//
// IMPORTANT:
// • You must cast to Vehicle when needed:
// Vehicle v = (Vehicle) s;
//
// TODO 5: Create array of Serviceable
// ============================================================
Serviceable[] serviceables = { tesla, toyota, ferrari, prius };
// ============================================================
// TODO 6:
// Loop through the Serviceable[] array:
//
// Steps inside loop:
//
// 1. Cast the current object to Vehicle:
// Vehicle v = (Vehicle) s;
//
// 2. Check:
// if (s.needsService(v)) { ... }
//
// 3. If true:
// - Print a message showing brand + model
// - Call s.performService();
//
// 4. Otherwise:
// - Print that the car does not need service
//
// Add blank lines between each item for readability.
// TODO 6: Loop through serviceables and perform service
// ============================================================
System.out.println("=== Service Check ===");
for (Serviceable s : serviceables) {
Vehicle v = (Vehicle) s;
if (s.needsService(v)) {
System.out.println(v.getBrand() + " " + v.getModel() + " needs service:");
s.performService();
} else {
System.out.println(v.getBrand() + " " + v.getModel() + " does not need service.");
}
System.out.println();
}
// ============================================================
// TODO 7 (Optional):
// After everything is done, print a final message:
//
// System.out.println("=== Workshop Completed ===");
//
// TODO 7: Final message
// ============================================================
System.out.println("=== Workshop Completed ===");
}
}
src/main/java/org/model/Car.java
+20 -15
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@@ -18,24 +18,29 @@ public abstract class Car extends Vehicle implements Serviceable {
public Car(String brand, String model, int year,
double mileage, int seats) {
// TODO: Call super constructor
super(brand, model, year, mileage);
this.seats = seats;
}
// TODO: Override getEnergyType() → return "Unknown"
public int getSeats() { return seats; }
// TODO: Override showDetails()
// Print brand, model, year, mileage, and number of seats
@Override
public String getEnergyType() { return "Unknown"; }
/*
* Implement Serviceable methods:
*
* needsService(Vehicle v):
* - Check the mileage of the current car
* - If mileage > 10000 return true
* - Otherwise return false
*
* performService():
* - Print: "General car service completed"
*/
@Override
public void showDetails() {
System.out.println("Brand: " + getBrand() + " | Model: " + getModel() +
" | Year: " + getYear() + " | Mileage: " + getMileage() +
" | Seats: " + seats);
}
@Override
public boolean needsService(Vehicle v) {
return v.getMileage() > 10000;
}
@Override
public void performService() {
System.out.println("General car service completed");
}
}
src/main/java/org/model/ElectricCar.java
+26 -7
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@@ -27,13 +27,32 @@ public class ElectricCar extends Car implements Chargeable {
this.chargeLevel = chargeLevel;
}
// TODO: Override getEnergyType() → return "Electric"
@Override
public String getEnergyType() { return "Electric"; }
// TODO: Override showDetails()
// Call super.showDetails()
// Print battery capacity and charge level
@Override
public void showDetails() {
super.showDetails();
System.out.println("Battery Capacity: " + batteryCapacity + " kWh | Charge Level: " + chargeLevel + "%");
}
// TODO: Implement charge(double amount)
// Validate negative
// Cap at 100
@Override
public void charge(double amount) {
if (amount < 0) {
System.out.println("Error: charge amount cannot be negative.");
return;
}
chargeLevel = Math.min(100, chargeLevel + amount);
}
@Override
public boolean needsService(Vehicle v) {
return v.getMileage() > 8000;
}
@Override
public void performService() {
System.out.println("Battery system checked");
chargeLevel = 100;
}
}
src/main/java/org/model/GasCar.java
+26 -7
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@@ -27,13 +27,32 @@ public class GasCar extends Car implements Refuelable {
this.fuelType = fuelType;
}
// TODO: Override getEnergyType() → return fuelType + " (Gas)"
@Override
public String getEnergyType() { return fuelType + " (Gas)"; }
// TODO: Implement refuel(double amount)
// Validate amount
// Cap at 100
@Override
public void refuel(double amount) {
if (amount < 0) {
System.out.println("Error: refuel amount cannot be negative.");
return;
}
fuelLevel = Math.min(100, fuelLevel + amount);
}
// TODO: Override showDetails()
// Call super.showDetails()
// Print fuel level and fuel type
@Override
public void showDetails() {
super.showDetails();
System.out.println("Fuel Level: " + fuelLevel + "% | Fuel Type: " + fuelType);
}
@Override
public boolean needsService(Vehicle v) {
return v.getMileage() > 12000;
}
@Override
public void performService() {
System.out.println("Engine oil changed");
fuelLevel = 100;
}
}
src/main/java/org/model/HybridCar.java
+57
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@@ -0,0 +1,57 @@
package org.model;
import org.behavior.Chargeable;
import org.behavior.Refuelable;
public class HybridCar extends Car implements Refuelable, Chargeable {
private double fuelLevel;
private double chargeLevel;
public HybridCar(String brand, String model, int year,
double mileage, int seats,
double fuelLevel, double chargeLevel) {
super(brand, model, year, mileage, seats);
this.fuelLevel = fuelLevel;
this.chargeLevel = chargeLevel;
}
@Override
public String getEnergyType() { return "Hybrid"; }
@Override
public void refuel(double amount) {
if (amount < 0) {
System.out.println("Error: refuel amount cannot be negative.");
return;
}
fuelLevel = Math.min(100, fuelLevel + amount);
}
@Override
public void charge(double amount) {
if (amount < 0) {
System.out.println("Error: charge amount cannot be negative.");
return;
}
chargeLevel = Math.min(100, chargeLevel + amount);
}
@Override
public void showDetails() {
super.showDetails();
System.out.println("Fuel Level: " + fuelLevel + "% | Charge Level: " + chargeLevel + "%");
}
@Override
public boolean needsService(Vehicle v) {
return v.getMileage() > 10000;
}
@Override
public void performService() {
System.out.println("Engine oil changed and battery system checked");
fuelLevel = 100;
chargeLevel = 100;
}
}
src/main/java/org/model/SportsCar.java
+15 -3
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@@ -24,7 +24,19 @@ public class SportsCar extends GasCar {
this.zeroToHundred = zeroToHundred;
}
// TODO: Override showDetails()
// Call super.showDetails()
// Print acceleration time
@Override
public void showDetails() {
super.showDetails();
System.out.println("0-100 km/h: " + zeroToHundred + "s");
}
@Override
public boolean needsService(Vehicle v) {
return v.getMileage() > 5000;
}
@Override
public void performService() {
System.out.println("High-performance brake system checked");
}
}
src/main/java/org/model/Vehicle.java
+12 -5
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@@ -20,13 +20,20 @@ public abstract class Vehicle {
this.mileage = mileage;
}
// TODO: Create getters for all fields
public String getBrand() { return brand; }
public String getModel() { return model; }
public int getYear() { return year; }
public double getMileage() { return mileage; }
// TODO: Implement addMileage(double km)
// If km is negative → print error
// Otherwise increase mileage
public void addMileage(double km) {
if (km < 0) {
System.out.println("Error: mileage cannot be negative.");
} else {
mileage += km;
}
}
// TODO: Declare abstract method getEnergyType()
public abstract String getEnergyType();
public void basicInfo() {
System.out.println(
src/main/java/org/util/VehicleInspector.java
+10 -5
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@@ -1,6 +1,8 @@
package org.util;
import org.*;
import org.model.ElectricCar;
import org.model.GasCar;
import org.model.SportsCar;
import org.model.Vehicle;
/*
@@ -14,9 +16,12 @@ public class VehicleInspector {
v.basicInfo();
// TODO:
// If ElectricCar → print "Check battery system"
// If SportsCar → print "Check brakes and performance"
// If GasCar → print "Check engine and oil"
if (v instanceof ElectricCar) {
System.out.println("Check battery system");
} else if (v instanceof SportsCar) {
System.out.println("Check brakes and performance");
} else if (v instanceof GasCar) {
System.out.println("Check engine and oil");
}
}
}