com/codegym/task/task15/task1529/Helicopter.java:4: error: com.codegym.task.task15.task1529.Helicopter is not abstract and does not override abstract method fly() in com.codegym.task.task15.task1529.CanFly public class Helicopter implements CanFly { ^ com/codegym/task/task15/task1529/Plane.java:4: error: com.codegym.task.task15.task1529.Plane is not abstract and does not override abstract method fly() in com.codegym.task.task15.task1529.CanFly public class Plane implements CanFly { ^