Java 8 default methods

Starting from Java 8, a method which is defined in an interface can have a default implementation:

For example:

interface Descriptive {
    default String desc() {
        return "fantastic";
class Item implements Descriptive {
    // the method "desc" is not implemented here
Item item = new Item();
item.desc(); // "fantastic"
class Book implements Descriptive {
    public String desc() {
        return "Cool book!";
Book book = new Book();
book.desc(); // "Cool book!"
Using default methods in interfaces

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