Lessons

You've reached Level 36

"Hi, Amigo!" "Hi, Bilaabo!" "You're already a solid programmer. So, today we're going to have a lesson on MVC." "MVC stands for Model—View—Controller. It's an architectural design pattern for large applications, where the application is split into three parts." "The first part contains all of the application's business logic. This part is called the model. It contains the code that does everything ..."

"There you are." "I thought about it and decided to teach you one more small lesson that will be very helpful for you. Until you work as a programmer, you likely never encounter some special terminology, so I want to introduce you to several common concepts now." "About 10 years ago, Enterprise Java Beans (EJB) became widely used." "What does JavaBeans mean?" "JavaBeans basically means coffee ..."

"Hi, Amigo!" "Hi, Ellie!" "Today we're going to wrap our heads around the structure of collections once and for all." "I've waited a long time for this." "You already know what collections are, and you know how to work with them. It's time to organize your knowledge into a strict system. Then many 'why' and 'how' questions will go away, and most things will become obvious ..."

"Hi, Amigo." "Hi, Diego. What's with the Chinese characters with a button in the center?" "It's the famous MVC design pattern! You have to know it. So, go wrap your head around the MVC pattern real quick. I think you'll understand what the characters mean after you finish the task. I'll give you one easy task and another large and more difficult task. When you solve the easy one, move on to the large one ..."

"If you think that we're all done with the List interface, then you're mistaken. We're just getting started. Let me tell you about the LinkedList and ArrayList collections." "I'll start with the ArrayList collection." "Here is how this collection's inheritance diagram looks ..."

"Hi, Amigo!" "Hello, Rishi!" "I found my old notes over there and prepared some interesting material for you. I think you'll be interested in hearing it." "Let's hear it. You always find something interesting that later proves to be very useful." "OK. Today I want to tell you about trees, so I will begin with graphs." "A graph is a system of points and lines that connect them. The points are called the vertices ..."

"Well, how is your processor?" "It's OK. I sat in liquid nitrogen for an hour, so now I'm as good as new!" "Great. Then let's continue." "Set collections." Mathematically speaking, a set is a group of unique elements. Thus, in programming, a Set is a collection of unique elements, i.e. a collection that doesn't let you store identical elements. "I don't know if Ellie showed you Set's inheritance hierarchy. If not, here it is ..."

"Hi, Amigo!" "Let's continue our lessons on how to google." "Here are some exercises ..."