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Complete VMS with polymorphism demonstration

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amirmohammad
2026-05-24 22:48:22 +03:30
parent 6cb8f9a8d8
commit 22726ea54d
8 changed files with 218 additions and 149 deletions
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.idea/misc.xml
Generated
+1 -1
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@@ -8,7 +8,7 @@
</list>
</option>
</component>
<component name="ProjectRootManager" version="2" languageLevel="JDK_21" default="true" project-jdk-name="21" project-jdk-type="JavaSDK">
<component name="ProjectRootManager" version="2" languageLevel="JDK_25" default="true" project-jdk-name="25" project-jdk-type="JavaSDK">
<output url="file://$PROJECT_DIR$/out" />
</component>
</project>
src/main/java/org/Main.java
+41 -103
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@@ -1,124 +1,62 @@
package org;
import org.model.Vehicle;
import org.model.ElectricCar;
import org.model.GasCar;
import org.model.SportsCar;
import org.util.VehicleInspector;
import org.behavior.Serviceable;
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(...);
// ============================================================
ElectricCar tesla = new ElectricCar(
"Tesla", "Model S", 2022, 1000,
100, 550, 50
);
GasCar toyota = new GasCar(
"Toyota", "Corolla", 2018, 85000,
5, 50, "Petrol"
);
SportsCar ferrari = new SportsCar(
"Ferrari", "F8 Tributo", 2021, 12000,
2, 3.9, "oil", 710
);
Vehicle[] vehicles = {tesla , toyota , ferrari};
// ============================================================
// 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).
// ============================================================
for (Vehicle v : vehicles) {
v.basicInfo();
System.out.println();
}
for (Vehicle v : vehicles) {
VehicleInspector.inspect(v);
}
Serviceable[] serviceables = {tesla, toyota, ferrari};
for (Serviceable s : serviceables) {
Vehicle v = (Vehicle) s;
// ============================================================
// 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.
// ============================================================
v.basicInfo();
if (s.needsService(v)) {
System.out.println(v.getBrand() + " " + v.getModel());
System.out.print("Performing service: ");
s.performService();
} else {
System.out.println(v.getBrand() + " " + v.getModel() + " does NOT need service");
}
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 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 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 7 (Optional):
// After everything is done, print a final message:
//
// System.out.println("=== Workshop Completed ===");
//
// ============================================================
System.out.println("=== Workshop Completed ===");
src/main/java/org/model/Car.java
+31 -18
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@@ -11,31 +11,44 @@ package org.model;
import org.behavior.Serviceable;
import java.lang.classfile.Superclass;
public abstract class Car extends Vehicle implements Serviceable {
private int seats;
public Car(String brand, String model, int year,
double mileage, int seats) {
// TODO: Call super constructor
public Car(String brand, String model, int year, double mileage, int seats) {
super(brand, model, year, mileage);
this.seats = seats;
}
// TODO: Override getEnergyType() → return "Unknown"
@Override
public String getEnergyType(){
return "Unknown";
}
// TODO: Override showDetails()
// Print brand, model, year, mileage, and number of seats
@Override
public void showDetails(){
System.out.print(
getYear() + " " + getBrand() + " " + getModel() +
" | Mileage: " + getMileage() +
" | Energy: " + getEnergyType() +
" | Seats: " + seats
);
System.out.println();
}
public boolean needsService(Vehicle v) {
if(getMileage() > 10000) {
return true;
}
else {
return false;
}
}
public void performService() {
System.out.println("General car service completed");
}
/*
* 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"
*/
}
src/main/java/org/model/ElectricCar.java
+42 -7
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@@ -27,13 +27,48 @@ 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.print(
" | battery Capacity: " + batteryCapacity +
" | charge Level: " + chargeLevel
);
System.out.println();
}
@Override
public void charge(double amount) {
if (amount <= 0) {
System.out.println("Error");
}
// TODO: Implement charge(double amount)
// Validate negative
// Cap at 100
if (this.chargeLevel + amount > 100) {
this.chargeLevel = 100;
}
else {
this.chargeLevel += amount;
}
}
@Override
public boolean needsService(Vehicle v) {
if(getMileage() > 8000) {
return true;
}
else {
return false;
}
}
@Override
public void performService() {
System.out.println("Battery system checked");
this.chargeLevel = 100;
}
}
src/main/java/org/model/GasCar.java
+41 -7
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@@ -27,13 +27,47 @@ 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
public void refuel(double amount) {
if (amount <= 0) {
System.out.println("Error");
return;
}
// TODO: Override showDetails()
// Call super.showDetails()
// Print fuel level and fuel type
if (this.fuelLevel + amount > 100) {
this.fuelLevel = 100;
} else {
this.fuelLevel += amount;
}
}
@Override
public void showDetails() {
super.showDetails();
System.out.print(
" | fuel type: " + fuelType +
" | fuel level: " + fuelLevel
);
System.out.println();
}
@Override
public boolean needsService(Vehicle v) {
if(getMileage() > 12000) {
return true;
}
else {
return false;
}
}
@Override
public void performService() {
System.out.println("Engine oil changed");
this.fuelLevel = 100;
}
}
src/main/java/org/model/SportsCar.java
+22 -3
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@@ -23,8 +23,27 @@ public class SportsCar extends GasCar {
this.zeroToHundred = zeroToHundred;
}
@Override
public void showDetails() {
super.showDetails();
System.out.print(
" | acceleration time: " + this.zeroToHundred
);
System.out.println();
}
// TODO: Override showDetails()
// Call super.showDetails()
// Print acceleration time
@Override
public boolean needsService(Vehicle v) {
if(getMileage() > 5000) {
return true;
}
else {
return false;
}
}
@Override
public void performService() {
System.out.println("High-performance brake system checked");
}
}
src/main/java/org/model/Vehicle.java
+28 -5
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@@ -20,13 +20,36 @@ public abstract class Vehicle {
this.mileage = mileage;
}
// TODO: Create getters for all fields
public String getBrand() {
// TODO: Implement addMileage(double km)
// If km is negative → print error
// Otherwise increase mileage
return brand;
}
// TODO: Declare abstract method getEnergyType()
public String getModel() {
return model;
}
public int getYear() {
return year;
}
public double getMileage() {
return mileage;
}
public void addMileage(double km) {
if ( km < 0 ) {
System.out.println("Error: Mileage cannot be negative!");
return;
}
this.mileage += km;
}
public abstract String getEnergyType();
public void basicInfo() {
System.out.println(
src/main/java/org/util/VehicleInspector.java
+12 -5
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@@ -2,7 +2,9 @@ package org.util;
import org.*;
import org.model.Vehicle;
import org.model.ElectricCar;
import org.model.SportsCar;
import org.model.GasCar;
/*
* Utility class to inspect vehicles.
* Demonstrates instanceof and polymorphism.
@@ -14,9 +16,14 @@ 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 SportsCar) {
System.out.println("→ Check brakes and performance");
}
else if (v instanceof ElectricCar) {
System.out.println("→ Check battery system");
}
else if (v instanceof GasCar) {
System.out.println("→ Check engine and oil");
}
}
}