Lesson: Interface

By default yeni susmaya gore interface-lerin icindeki istenilen metod  public abstract sayilir. 

By default istenilen vairable public static final sayilir.

*** Be cautious:

package az.etibarli;

public interface Flyable {
    void fly();
}

package az.etibarli;

public class Parent implements Flyable{
    @Override
    public void fly() {
        System.out.println("Parent fly");
    }
}

package az.etibarli;

public class Child implements Flyable{
    @Override
    public void fly() {
        System.out.println("Child fly");
    }
}

package az.etibarli;

import java.sql.SQLException;

public class Main {
    public static void main(String[] args) throws SQLException {
        Parent parent = new Parent();
        Flyable flyable = parent;
        Child child = (Child) flyable;
        child.fly();
    }
}

-- Marker interface: bow bir interface-dir. Filter meqsedi ile qoyulur. Mes: Serializable. File yazib oxumaq ucun istifade olunur.