What am i missing?

Question about the task

All that moves

Java Core, Level 3, Lesson 2

Under discussion

Can somebody explain it to me?

1. Create a CanMove interface that has a speed method.
2. The speed method must return a Double and should not accept any arguments.
3. Make the CanFly interface inherit the CanMove interface.
4. Add the speed method to the CanFly interface.
5. The speed method must return a Double and accept one CanFly argument.

Requirements:

The Solution class must declare a CanMove interface.
The Solution class must declare a CanFly interface.
The CanFly interface must inherit the CanMove interface.
The CanMove interface must declare a speed method with no parameters and must return a Double.
The CanFly interface must declare a speed method with one CanFly parameter and must return a Double.

package com.codegym.task.task13.task1309; /* All that moves */ public class Solution { public static void main(String[] args) { } interface CanMove{ Double sped = 1.1; default Double speed(){ return sped; } } interface CanFly extends CanMove{ Double =1.2; default Double speed(){ return Double; } } }

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Kotlet

Level 28 , Wroclaw, Poland

8 August 2019, 13:52

useful

You don't need to declare double variable or creating default method. In CanMove interface the speed method should return double and accept no arguments so something like this

Double speed();

. In CanFly interface the overridden method speed must return Double and accept one parameter CanFly. So something like this:

Double speed(CanFly c);

ddi

Level 18 , Dortmund, Germany

8 August 2019, 14:23

Thanks i was exploring this solution afterwords, the problem was the argument CanFly "C" has i was trying CanFly or Double. Thank you!