Here's an example code for the class representing an airplane, which extends from the `Vehicle` class and implements the `Flying` interface:

```
public class Airplane extends Vehicle implements Flying {
    private double altitude;
    private boolean isFlying;
    
    public Airplane(String make, String model, int year, double weight) {
        super(make, model, year, weight);
        altitude = 0;
        isFlying = false;
    }
    
    // Implement the methods from the Flying interface
    public void takeOff() {
        isFlying = true;
        System.out.println("The airplane has taken off.");
    }
    
    public void land() {
        isFlying = false;
        altitude = 0;
        System.out.println("The airplane has landed.");
    }
    
    public void increaseAltitude(double meters) {
        if (isFlying) {
            altitude += meters;
            System.out.println("The airplane has increased its altitude by " + meters + " meters.");
        } else {
            System.out.println("The airplane needs to take off first.");
        }
    }
    
    public void decreaseAltitude(double meters) {
        if (isFlying) {
            altitude -= meters;
            System.out.println("The airplane has decreased its altitude by " + meters + " meters.");
        } else {
            System.out.println("The airplane needs to take off first.");
        }
    }
    
    // Implement any other methods specific to the Airplane class
    // ...
}
```

In the code above, the `Airplane` class has a `double` attribute called `altitude` to represent its current altitude, and a `boolean` attribute called `isFlying` to indicate whether the airplane is currently flying or not. The class also has a constructor that calls the constructor of its superclass, passing the necessary parameters.

The class implements the `Flying` interface, which defines four methods (`takeOff()`, `land()`, `increaseAltitude(double meters)`, and `decreaseAltitude(double meters)`). These methods are implemented to reflect the behavior of an airplane when flying.

Finally, the class can also have other methods specific to airplanes, depending on the requirements of the application.
Costruisci una classe per rappresentare un aeroplano. Estende Veicolo e interfaccia Volante.