Question

How can i print the array in VehicleTest.java with out the hashcode behind the array element?

Vehicle.java

public abstract class Vehicle {
    // class that can describe many vehicle types
    abstract public double GetCarbonFootPrint();
}

Car.java

public class Car extends Vehicle{

    private double gallon;

    public Car()
    {
        this.gallon = 0;// set gallon to 0
    }

    public Car(double gallon)
    {
        this.gallon = gallon;
    }

    @Override
    public double GetCarbonFootPrint() {
        return (this.gallon * 20);// carbon footprint is #gallons*20
    }
}

Bicycle.java

public class Bicycle extends Vehicle{

    @Override
    public double GetCarbonFootPrint() {
        return 0; // carbon footprint is always 0
    }
}

VehicleTest.java

import java.util.Arrays;

public class VehicleTest {

    public static void main(String[]args)
    {
        // array to hold each vehicle
        Vehicle vehicles[] = new Vehicle[2];

        vehicles[0] = new Car(40);
        vehicles[1] = new Bicycle();
        // loop to display results of each vehicles footprint
        for(int i = 0; i < vehicles.length; i++)
        {
            System.out.println("Carbon Footprint for " + vehicles[i] + ": "
                    + String.format("%.2f", vehicles[i].GetCarbonFootPrint()));
        }
    }
}

OUTPUT

Carbon Footprint for Car@1e67b872: 800.00
Carbon Footprint for Bicycle@60addb54: 0.00

Answer 1

//Vehicle.java
public abstract class Vehicle {
    // class that can describe many vehicle types
    abstract public double GetCarbonFootPrint();
}

/////////////////////////////////////////////////////////

//Car.java
public class Car extends Vehicle{

    private double gallon;

    public Car()
    {
        this.gallon = 0;// set gallon to 0
    }

    public Car(double gallon)
    {
        this.gallon = gallon;
    }

    @Override
    public double GetCarbonFootPrint() {
        return (this.gallon * 20);// carbon footprint is #gallons*20
    }

    @Override
    public String toString() {
        return "Car{" +
                "gallon=" + gallon +
                '}';
    }
}

/////////////////////////////////////////////////////////

//Bicycle.java
public class Bicycle extends Vehicle{

    @Override
    public double GetCarbonFootPrint() {
        return 0; // carbon footprint is always 0
    }

    @Override
    public String toString() {
        return "Bicycle{}";
    }
}

/////////////////////////////////////////////////////////

//VehicleTest.java
public class VehicleTest {

    public static void main(String[]args)
    {
        // array to hold each vehicle
        Vehicle vehicles[] = new Vehicle[2];

        vehicles[0] = new Car(40);
        vehicles[1] = new Bicycle();
        // loop to display results of each vehicles footprint
        for(int i = 0; i < vehicles.length; i++)
        {
            System.out.println("Carbon Footprint for " + vehicles[i] + ": "
                    + String.format("%.2f", vehicles[i].GetCarbonFootPrint()));
        }
    }
}

/////////////////////////////////////////////////////////