Contoh penggunaan Constructor, Inheritance, dan Encapsulation

per2_Engine.java

package per2;

public class Engine {
    private String manufacturer;
    private double engineDisplacement;
    private String fuelType;
    private int yearProduction;

    public Engine (
            String manufacturer,
            double engineDisplacement,
            String fuelType,
            int yearProduction
    ) {
        this.manufacturer = manufacturer;
        this.engineDisplacement = engineDisplacement;
        this.fuelType = fuelType;
        this.yearProduction = yearProduction;
    }

    public String getManufacturer() {
        return manufacturer;
    }

    public double getEngineDisplacement() {
        return engineDisplacement;
    }

    public String getFuelType() {
        return fuelType;
    }

    public int getYearProduction() {
        return yearProduction;
    }
}

per2_EngineFunctions.java

package per2;

public class EngineFunctions {
    Engine engine;

    public void setEngine(Engine engine) {
        this.engine = engine;
    }

    public void printManufacturer() {
        System.out.println("Manufactured by: " + engine.getManufacturer());
    }

    public void printEngineDispacment() {
        System.out.println(engine.getEngineDisplacement() + " cc");
    }

    public void printFuelType() {
        System.out.println("This engine using " + engine.getFuelType() + " fuel");
    }

    public void printYearProduction() {
        System.out.println("Production " + engine.getYearProduction());
    }
}

per2_Mobil.java

package per2;

public class Mobil extends EngineFunctions{
    public Mobil (Engine engine) {
        setEngine(engine);
    }

    public static void main(String[] args) {
        Engine engine = new Engine("Honda", 2200, "Gasoline", 2019);
        Mobil mobil = new Mobil(engine);

        System.out.println("Here are the specifications of your car: ");
        mobil.printManufacturer();
        mobil.printYearProduction();
        mobil.printEngineDispacment();
        mobil.printFuelType();
    }
}