09. Exercise: Interfaces

Exercise: Interfaces

Create the Vehicle interface

Task Description:

Let's get some practice with interfaces. First, follow these steps to create an interface named Vehicle:

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Create a Car subclass

Task Description:

Next, you will be creating a subclass to the Vehicle interface named Car:

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Solution

ND079 C1 L3 A07b Interface Solution

Here is the solution for creating the Vehicle interface. You might have noticed that when you created the Car subclass and implemented the Vehicle interface that InteliJ gave you an error. The error should have been describing that you need to override the Vehicle methods.

One other thing to note is that that Interfaces are types just like classes are types!

public interface Vehicle {

    public String getType();

    public String getSpeed();

    public String getColor();

}
public class Car implements Vehicle {
    private String type;
    private String speed;
    private String color;

    public Car(String type, String speed, String color) {
        super();
        this.type = type;
        this.speed = speed;
        this.color = color;
    }

    @Override
    public String getType() {
        return type;
    }

    @Override
    public String getSpeed() {
        return speed;
    }

    @Override
    public String getColor() {
        return color;
    }

}

In the solution video I demonstrated how classes can implement more than one interface. Here is the Production interface I used in the video. This was not required for the exercise, I just wanted to show you for demonstration purposes. 

public interface Production {

    public String location;

}

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