Lessons

"Hi, Amigo!" "Now it's time for the main event. We'll get acquainted with the Class class and touch on Reflection. As you probably already realized, everything in Java is an object. And what does an object need? What does each object have that defines what it's all about?" "A class!" "Right! Well done. Each object has a class. But getting back to objects... Some objects entirely contain an entity, while others simply help manage it ..."

"Hi, Amigo!" "I can teach you my special skill: avoiding unnecessary work." "Hmm. I like how this is starting." "Remember, it's impossible to know everything. And it's not necessary. But, if you can quickly find the information you need, then you're golden." "Java is growing so quickly, because Java programmers use each other's work. The Internet has millions of Java libraries that are well written, debugged, documented, and license free ..."

"Greetings, Amigo! I'm glad you came to visit. Are you having success?" "Hello, Professor Noodles! I think there are a few topics that I still haven't entirely figured out... Learning will become more interesting but also more difficult, right?" "Yes, it will, my friend. I prepared some things ..."

"Hi, Amigo!" "I've got an idea. When I sleep with someone ugly, I'll call it 'sexual charity' so I don't feel so embarrassed." "Ahh, I see, you're a philanthropist..."

"I almost forgot. Here are some potential interview questions that we covered in this level ..."

"Hi, Amigo!" "Hello, Captain Squirrels, sir!" "Now we're going to learn how to write big projects. Accordingly, we're introducing a new type of task: the «big task». It's one big task, broken up into many small ones. When solving each «small task» you'll add new code to your existing code, instead of writing something from scratch. The federation's future is in your hands" "Yes, sir!" "The goal of the first five «big tasks» is to learn how to write ..."

You've leveled up!

Today Bilaabo will tell you about mutable and immutable objects.

"Hi, Amigo!" "But, Bilaabo, you've already said hello." "Really? Well, I still like starting each lesson with that phrase." "Today we're going to study the String class in depth." "But, I already know everything about it. I even know that the String class is immutable." "The String class has 46 methods. How many of them do you know?" "No more than ten. Actually, probably about 5 max." "Then listen up." "Java's creators noticed that most ..."

"Hi, Amigo!" "Hi, Ellie." "I'm going to tell you about substrings. A substring is a part of a string. And the most common operation performed on strings (after combining several strings together) is obtaining a substring." How do I get part of a String? "The substring method returns part of a String. This method has two versions." "The first version returns the substring specified by starting and ending indices. But the character at the ending index ..."

"Check out some other things you can do with substrings: How do I find a substring? The indexOf and lastIndexOf methods let you search for strings within strings. There are 4 versions of these methods: The indexOf method looks for a string in a specified String. The method can search for the string from the beginning of the specified String, or starting from some index (the second method). If the string is found, then the method returns ..."

"Hi, Amigo!" "You won't believe it. I just finished all the tasks for you!" "Sweet! Thanks, Diego." "But I'm not going to give them to you. So, you do them—it will make you smarter ..."