JDK8新特性之接口默认方法与静态方法

default void forEach(Consumer<? super T> action) {
    Objects.requireNonNull(action);
    for (T t : this) {
        action.accept(t);
    }
}

public static void main(String[] args) {
    IUserInterface userInterface = new UserServiceImpl();
    System.out.println(userInterface.getDefaultUser1());
    System.out.println(IUserInterface.getDefaultUser2());
}

interface IUserInterface {

    default User getDefaultUser1() {
        return new User("Susan1", 11);
    }

    static User getDefaultUser2() {
        return new User("Susan2", 22);
    }

}

static class UserServiceImpl implements IUserInterface {

}