Error in task or my code?

Question about the task

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Hi, here is my code. I think that I understand what mean implementations, do you see any mistake here? Thank a lot of help.

The Car and Bus classes implement the Vehicle interface. However, their implementations of some of its methods are the same.
Implement these methods as default in the Vehicle interface itself, and then remove them from the Car and Bus classes.

Requirements:

The Vehicle interface should implement the default void start() method.
The Vehicle interface should implement the default void stop() method.
The Car class should not implement the void start() and void stop() methods.
The Bus class should not implement the void start() and void stop() methods.

package en.codegym.task.pro.task17.task1716; public abstract class Bus implements Vehicle { public abstract void start(); public void move() { System.out.println("I'm driving at an average speed of 50 km/h."); } public abstract void stop(); }

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michal9696

Level 18 , Poland, Poland

2 September 2022, 19:05

Hi, I needed to remove those method. This task was easy but solution wasn't clear ;)

Guadalupe Gagnon

Level 37 , Tampa, United States

2 September 2022, 18:24

solution

Normally all methods that are defined in an interface are required in any class that implements that interface. The default keyword modifies this behavior in that the methods that are default are no longer required to be in classes implementing the interface. It is not required but you can add them If you want, in this case they would over rider the default implementation. I think your confusion is just a translation error. Implementation can either mean that you code a block of code for the method (this is what you did by "not" implementing the block of code); or it can mean actually exist in the class, which I believe the task is asking for. Remove the method completely from both classes where the interface already has a default implementation. If you made any changes to the code not specified in the conditions I would restore the code by resetting the task first.