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Difference between use Interface and class in java

`public class Main { public static void main(String[] args) { Vehicle vehicle = new Vehicle(“Dodge “,”Black”,1000); Moveable moveable = (Moveable)vehicle;//it’s an interface vehicle.Move(); moveable.Move(); } }` why recommended that it’s better create an instance of interface rather an object of class? if we use interface should reduce complexity but there isn’t any difference between object […]