Java8 Static Defaults

Static Default Methods

An interface can also have static helper methods from Java 8 onwards.
A class is implementing two interfaces with same static methods. i.e. You may add a method with the same signature in an implementing class, you’re not truly overriding the static interface method.
Being a static method you do not need object reference to call that method.
The static method can only be called through the interface or class type reference, not on instance.

EducationalBook.readingStories();

ComicBook.readingStories();

Example -

In interface EducationalBook.java

public interface EducationalBook {
   static void readingStories(){
        System.out.println("Reading Stories in Educational books!!!");
    }
}

In interface ComicBook.java

public interface ComicBook {
   static void readingStories(){
        System.out.println("Reading Stories in comic book!!!");
    }
}

In Class Book.java which implements multiple interfaces EducationalBook, ComicBook.

public class Book implements EducationalBook, ComicBook {

    public static void main(String args[]){
        EducationalBook.readingStories();
        ComicBook.readingStories();
    }
}

Output

Reading Stories in Educational books!!!
Reading Stories in comic book!!!

Example -Combining Multiple inheritance having Multiple Default method & Static Default method

In interface EducationalBook.java

public interface EducationalBook {
    default void read(){
        System.out.println("I am reading an Educational Book!");
    }

    static void readingStories(){
        System.out.println("Reading Stories in Educational books!!!");
    }
}

In interface ComicBook.java

public interface ComicBook {
    default void read(){
        System.out.println("I am reading a Comic Book!");
    }

    static void readingStories(){
        System.out.println("Reading Stories in comic book!!!");
    }
}

In Class Book.java which implements multiple interfaces EducationalBook, ComicBook.

public class Book implements EducationalBook, ComicBook {

    @Override
    public void read() {
        System.out.println("I read books like Educational books and Comic books!");
        EducationalBook.super.read();
        ComicBook.super.read();
        EducationalBook.readingStories();
        ComicBook.readingStories();
    }

    public static void main(String args[]){
        Book book = new Book();
        book.read();
    }
}

Output

I read books like Educational books and Comic books!
I am reading an Educational Book!
I am reading a Comic Book!
Reading Stories in Educational books!!!
Reading Stories in comic book!!!