neda/WS-03-advanced-oop-test
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advanced oop

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neda
2026-07-19 06:45:15 +03:30
parent 6cb8f9a8d8
commit ca9a3af22e
8 changed files with 410 additions and 203 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_26" project-jdk-name="26" project-jdk-type="JavaSDK">
<output url="file://$PROJECT_DIR$/out" />
</component>
</project>
src/main/java/org/Main.java
+124 -93
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@@ -1,126 +1,157 @@
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(...);
// ============================================================
ElectricCar tesla =
new ElectricCar(
"Tesla",
"Model 3",
2024,
6000,
5,
75,
80
);
GasCar toyota =
new GasCar(
"Toyota",
"Camry",
2022,
15000,
5,
60,
"Petrol"
);
SportsCar ferrari =
new SportsCar(
"Ferrari",
"488",
2023,
7000,
2,
90,
"Premium Petrol",
3.2
);
Vehicle[] vehicles =
{
tesla,
toyota,
ferrari
};
System.out.println("=== Vehicle Information ===");
for(Vehicle v : vehicles){
v.basicInfo();
System.out.println();
}
System.out.println("=== Inspection ===");
// ============================================================
// 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){
VehicleInspector.inspect(v);
System.out.println();
}
// ============================================================
// 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.
// ============================================================
Serviceable[] serviceables =
{
tesla,
toyota,
ferrari
};
// ============================================================
// TODO 4:
// Use VehicleInspector to inspect each vehicle:
//
// VehicleInspector.inspect(v);
//
// Purpose:
// • Demonstrate the use of `instanceof`
// • Show subclass‑specific inspection messages
// ============================================================
System.out.println("=== Service Check ===");
for(Serviceable s : serviceables){
// ============================================================
// 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;
//
// ============================================================
Vehicle v = (Vehicle)s;
if(s.needsService(v)){
// ============================================================
// 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(
v.getBrand()
+ " "
+ v.getModel()
+ " needs service"
);
s.performService();
}
else{
System.out.println(
v.getBrand()
+ " "
+ v.getModel()
+ " does not need service"
);
}
System.out.println();
}
System.out.println(
"=== Workshop Completed ==="
);
}
}
src/main/java/org/model/Car.java
+40 -25
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@@ -1,41 +1,56 @@
package org.model;
/*
* Car extends Vehicle.
* This class SHOULD implement Serviceable.
*
* Service logic for Car:
* - needsService(): return true if mileage > 10,000
* - performService(): print "General car service completed"
*/
import org.behavior.Serviceable;
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
super(brand, model, year, mileage);
this.seats = seats;
}
// TODO: Override getEnergyType() → return "Unknown"
// TODO: Override showDetails()
// Print brand, model, year, mileage, and number of seats
/*
* 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"
*/
public int getSeats(){
return seats;
}
@Override
public String getEnergyType() {
return "Unknown";
}
@Override
public void showDetails(){
System.out.println(
"Brand: " + getBrand()
+ "\nModel: " + getModel()
+ "\nYear: " + getYear()
+ "\nMileage: " + getMileage()
+ "\nSeats: " + 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
+63 -18
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@@ -1,39 +1,84 @@
package org.model;
/*
* ElectricCar extends Car.
* It already inherits Serviceable from Car.
*
* Service logic for ElectricCar:
* - needsService(): return true if mileage > 8000
* - performService():
* Print "Battery system checked"
* Reset chargeLevel to 100
*/
import org.behavior.Chargeable;
public class ElectricCar extends Car implements Chargeable {
private int batteryCapacity;
private double chargeLevel;
public ElectricCar(String brand, String model, int year,
double mileage, int seats,
int batteryCapacity, double chargeLevel) {
super(brand, model, year, mileage, seats);
this.batteryCapacity = batteryCapacity;
this.chargeLevel = chargeLevel;
}
// TODO: Override getEnergyType() → return "Electric"
// TODO: Override showDetails()
// Call super.showDetails()
// Print battery capacity and charge level
// TODO: Implement charge(double amount)
// Validate negative
// Cap at 100
@Override
public String getEnergyType(){
return "Electric";
}
@Override
public void showDetails(){
super.showDetails();
System.out.println(
"Battery Capacity: " + batteryCapacity
+ "\nCharge Level: " + chargeLevel
);
}
@Override
public void charge(double amount){
if(amount < 0){
System.out.println("Charge amount cannot be negative");
return;
}
chargeLevel += amount;
if(chargeLevel > 100){
chargeLevel = 100;
}
}
@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
+70 -18
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@@ -1,39 +1,91 @@
package org.model;
/*
* GasCar extends Car.
* Inherits Serviceable from Car.
*
* Service logic for GasCar:
* - needsService(): return true if mileage > 12000
* - performService():
* Print "Engine oil changed"
* Reset fuelLevel to 100
*/
import org.behavior.Refuelable;
public class GasCar extends Car implements Refuelable {
private double fuelLevel;
private String fuelType;
public GasCar(String brand, String model, int year,
double mileage, int seats,
double fuelLevel, String fuelType) {
super(brand, model, year, mileage, seats);
this.fuelLevel = fuelLevel;
this.fuelType = fuelType;
}
// TODO: Override getEnergyType() → return fuelType + " (Gas)"
// TODO: Implement refuel(double amount)
// Validate amount
// Cap at 100
// TODO: Override showDetails()
// Call super.showDetails()
// Print fuel level and fuel type
@Override
public String getEnergyType(){
return fuelType + " (Gas)";
}
@Override
public void refuel(double amount){
if(amount < 0){
System.out.println("Fuel amount cannot be negative");
return;
}
fuelLevel += amount;
if(fuelLevel > 100){
fuelLevel = 100;
}
}
@Override
public void showDetails(){
super.showDetails();
System.out.println(
"Fuel Level: " + fuelLevel
+ "\nFuel 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/SportsCar.java
+40 -13
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@@ -1,30 +1,57 @@
package org.model;
/*
* SportsCar extends GasCar.
*
* Special service logic for SportsCar:
* - needsService(): return true if mileage > 5000
* - performService():
* Print "High-performance brake system checked"
*/
public class SportsCar extends GasCar {
private double zeroToHundred;
public SportsCar(String brand, String model, int year,
double mileage, int seats,
double fuelLevel, String fuelType,
double zeroToHundred) {
super(brand, model, year, mileage, seats,
fuelLevel, fuelType);
super(brand, model, year, mileage,
seats, fuelLevel, fuelType);
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 + " seconds"
);
}
@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
+30 -11
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@@ -1,11 +1,5 @@
package org.model;
/*
* Abstract base class for all vehicles.
* This class DOES NOT implement Serviceable.
* Service behavior will be defined in concrete subclasses.
*/
public abstract class Vehicle {
private String brand;
@@ -20,13 +14,37 @@ public abstract class Vehicle {
this.mileage = mileage;
}
// TODO: Create getters for all fields
// TODO: Implement addMileage(double km)
// If km is negative → print error
// Otherwise increase mileage
public String getBrand() {
return brand;
}
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("Mileage cannot be negative");
return;
}
mileage += km;
}
public abstract String getEnergyType();
// TODO: Declare abstract method getEnergyType()
public void basicInfo() {
System.out.println(
@@ -36,5 +54,6 @@ public abstract class Vehicle {
);
}
public abstract void showDetails();
}
src/main/java/org/util/VehicleInspector.java
+28 -10
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@@ -1,22 +1,40 @@
package org.util;
import org.*;
import org.model.Vehicle;
/*
* Utility class to inspect vehicles.
* Demonstrates instanceof and polymorphism.
*/
import org.model.*;
public class VehicleInspector {
public static void inspect(Vehicle v){
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"
);
}
}
}