
Head First Java: A Brain-Friendly Guide, 3rd Edition
- Length: 752 pages
- Edition: 3
- Language: English
- Publisher: O'Reilly Media
- Publication Date: 2022-06-21
- ISBN-10: 1491910771
- ISBN-13: 9781491910771
- Sales Rank: #26169 (See Top 100 Books)
see https://ragadamed.com.br/2024/09/18/p41kiarmo What will you learn from this book?
https://www.drcarolineedwards.com/2024/09/18/hxvtuxq96tventer Ready to learn Java? This book combines puzzles, strong visuals, mysteries, and soul-searching interviews with famous Java objects to engage you in many different ways. It’s fast, it’s fun, and it’s effective. And despite its playful appearance, Head First Java is serious stuff: a complete introduction to object-oriented programming and Java. You’ll learn everything from the fundamentals to advanced topics.
https://semnul.com/creative-mathematics/?p=ejrxmfqvusee url The new third edition brings the book up-to-date for Java 8-17, including major recent updates to the Java language and development platform. Java has seen some deep code-level changes and more modern approaches, requiring even more careful study and implementation. So learning the Head First way is more important than ever.
Order Valium From Mexicohttps://trevabrandonscharf.com/ehq44t0 https://traffordhistory.org/lookingback/ssur0dttcmw What’s so special about this book?
https://livingpraying.com/opyocwymb6phttps://marcosgerente.com.br/qgijefu If you’ve read a Head First book, you know what to expect–a visually rich format designed for the way your brain works. If you haven’t, you’re in for a treat. With this book, you’ll learn Java through a multi-sensory experience that engages your mind rather than a text-heavy approach that puts you to sleep.
https://www.thoughtleaderlife.com/2fswrvh5https://www.parolacce.org/2024/09/18/7gv8jc5filb Other books in O’Reilly’s Head First series Table of Contents (the real thing) How to Use This Book: Intro Who is this book for? Who should probably back away from this book? We know what you’re thinking And we know what your brain is thinking Metacognition: thinking about thinking Here’s what WE did: Here’s what YOU can do to bend your brain into submission What you need for this book: Last-minute things you need to know: Technical Reviewers for the 3rd Edition Other people to acknowledge for the 3rd Edition Technical Editors for the 2nd Edition Other people to credit, for the 2nd Edition Just when you thought there wouldn’t be any more acknowledgments* 1. Breaking the Surface: Dive In: A Quick Dip The way Java works What you’ll do in Java A very brief history of Java Speed and memory usage Code structure in Java What goes in a source file? What goes in a class? What goes in a method? Anatomy of a class Writing a class with a main() What can you say in the main method? Looping and looping and... Simple boolean tests Example of a while loop Conditional branching Coding a serious business application Monday morning at Bob’s Java-enabled house Phrase-O-Matic How it works Exercise Code Magnets BE the Compiler JavaCross Mixed Messages Pool Puzzle Exercise Solutions Sharpen your pencil Code Magnets BE the Compiler Pool Puzzle JavaCross Mixed Messages 2. A Trip to Objectville: Classes and Objects Chair Wars (or How Objects Can Change Your Life) At Laura’s desk At Brad’s laptop at the cafe Back at Laura’s desk At Brad’s laptop at the beach Back at Laura’s desk At Brad’s laptop on his lawn chair at the Telluride Bluegrass Festival So, Brad the OO guy got the chair and desk, right? What about the Amoeba rotate()? The suspense is killing me. Who got the chair and desk? When you design a class, think about the objects that will be created from that class type. Think about: What’s the difference between a class and an object? A class is not an object (but it’s used to construct them) Making your first object Making and testing Movie objects Quick! Get out of main! The two uses of main: The Guessing Game Running the Guessing Game Exercise BE the Compiler Code Magnets Pool Puzzle Who Am I? Exercise Solutions Code Magnets BE the Compiler Puzzle Solutions Who Am I? 3. Know Your Variables: Primitives and References Declaring a variable “I’d like a double mocha, no, make it an int.” Primitive Types You really don’t want to spill that... Back away from that keyword! This table reserved Controlling your Dog object An object reference is just another variable value Java Exposed Life on the garbage-collectible heap Life and death on the heap An array is like a tray of cups Arrays are objects too Make an array of Dogs Control your Dog (with a reference variable) What happens if the Dog is in a Dog array? A Dog example Exercise BE the Compiler Code Magnets Pool Puzzle A Heap o’ Trouble The case of the pilfered references Five-Minute Mystery Exercise Solutions Sharpen your pencil Code Magnets BE the Compiler Puzzle Solutions Five-Minute Mystery A Heap o’ Trouble 4. How Objects Behave: Methods Use Instance Variables Remember: a class describes what an object knows and what an object does Can every object of that type have different method behavior? The size affects the bark You can send things to a method You can get things back from a method You can send more than one thing to a method Calling a two-parameter method and sending it two arguments You can pass variables into a method, as long as the variable type matches the parameter type Java is pass-by-value. That means pass-by-copy. Reminder: Java cares about type! Cool things you can do with parameters and return types Encapsulation Do it or risk humiliation and ridicule. Hide the data Java Exposed Encapsulating the GoodDog class How do objects in an array behave? Declaring and initializing instance variables The difference between instance and local variables Comparing variables (primitives or references) Exercise BE the Compiler Who Am I? Mixed Messages Pool Puzzle Five-Minute Mystery Exercise Solutions Sharpen your pencil BE the Compiler Who Am I? Puzzle Solutions Five-Minute Mystery Mixed Messages 5. Extra-Strength Methods: Writing A Program Let’s build a Battleship-style game: “Sink a Startup” First, a high-level design The “Simple Startup Game” a gentler introduction Developing a Class The three things we’ll write for each class: Writing the method implementations Writing test code for the SimpleStartup class Based on this prep code: Here’s what we should test: Test code for the SimpleStartup class The checkYourself() method Just the new stuff Final code for SimpleStartup and SimpleStartupTestDrive Prep code for the SimpleStartupGame class Everything happens in main() The game’s main() method random() and getUserInput() One last class: GameHelper Let’s play What’s this? A bug ? Gasp! More about for loops Regular (non-enhanced) for loops Trips through a loop Difference between for and while The enhanced for loop Casting primitives Exercise BE the JVM Code Magnets JavaCross Mixed Messages Exercise Solutions Be the JVM Code Magnets Puzzle Solutions JavaCross Mixed Messages 6. Using the Java Library: Get to Know the Java API In our last chapter, we left you with the cliff-hanger: a bug How it’s supposed to look How the bug looks So what happened? How do we fix it? Option one is too clunky Option two is a little better, but still pretty clunky Wake up and smell the library Some things you can do with ArrayList Java Exposed Solution Sharpen your pencil Comparing ArrayList to a regular array Let’s fix the Startup code New and improved Startup class Let’s build the REAL game: “Sink a Startup” What needs to change? Who does what in the StartupBust game (and when) Prep code for the real StartupBust class The final version of the Startup class Super powerful Boolean expressions Ready-Bake Code Using the Library (the Java API) You have to know the full name* of the class you want to use in your code. How to discover the API Browse a book Use the HTML API docs Using the class documentation Exercise Code Magnets JavaCross Exercise Solutions Code Magnets JavaCross 7. Better Living in Objectville: Inheritance and Polymorphism Chair Wars Revisited... What about the Amoeba rotate()? Understanding Inheritance An inheritance example: Let’s design the inheritance tree for an Animal simulation program Using inheritance to avoid duplicating code in subclasses Do all animals eat the same way? Which methods should we override? Looking for more inheritance opportunities Which method is called? Designing an Inheritance Tree Using IS-A and HAS-A But wait! There’s more! How do you know if you’ve got your inheritance right? When designing with inheritance, are you using or abusing? So what does all this inheritance really buy you? Inheritance lets you guarantee that all classes grouped under a certain supertype have all the methods that the supertype has* Keeping the contract: rules for overriding Overloading a method Exercise Mixed Messages BE the Compiler Exercise Solutions BE the Compiler Mixed Messages Pool Puzzle 8. Serious Polymorphism: Interfaces and Abstract Classes Did we forget about something when we designed this? The compiler won’t let you instantiate an abstract class Abstract vs. Concrete Abstract methods You MUST implement all abstract methods Polymorphism in action Uh-oh, now we need to keep Cats, too What about non-Animals? Why not make a class generic enough to take anything? So what’s in this ultra-super-megaclass Object? Using polymorphic references of type Object has a price... When a Dog won’t act like a Dog Objects don’t bark Get in touch with your inner Object Polymorphism means “many forms.” Casting an object reference back to its real type. What if you need to change the contract? Let’s explore some design options for reusing some of our existing classes in a PetShop program Interface to the rescue! Making and implementing the Pet interface Invoking the superclass version of a method Exercise Pool Puzzle Exercise Solutions What’s the Picture ? What’s the Declaration? Pool Puzzle 9. Life and Death of an Object: Constructors and Garbage Collection The Stack and the Heap: where things live Methods are stacked A stack scenario What about local variables that are objects? If local variables live on the stack, where do instance variables live? The miracle of object creation Construct a Duck Initializing the state of a new Duck Using the constructor to initialize important Duck state* Make it easy to make a Duck Be sure you have a no-arg constructor Doesn’t the compiler always make a no-arg constructor for you? No! Nanoreview: four things to remember about constructors Wait a minute...we never DID talk about superclasses and inheritance and how that all fits in with constructors The role of superclass constructors in an object’s life Making a Hippo means making the Animal and Object parts too... How do you invoke a superclass constructor? Can the child exist before the parents? Superclass constructors with arguments Invoking one overloaded constructor from another Now we know how an object is born, but how long does an object live? What about reference variables? Exercise BE the Garbage Collector Popular Objects Five-Minute Mystery Exercise Solutions Be the Garbage Collector Popular Objects Five-Minute Mystery 10. Numbers Matter: Numbers and Statics MATH methods: as close as you’ll ever get to a global method The difference between regular (non-static) and static methods What it means to have a class with static methods Static methods can’t use non-static (instance) variables! Static methods can’t use non-static methods, either! Static variable: value is the same for ALL instances of the class Initializing a static variable static final variables are constants final isn’t just for static variables... Math methods Wrapping a primitive Java will Autobox primitives for you Autoboxing works almost everywhere But wait! There’s more! Wrappers have static utility methods too! And now in reverse...turning a primitive number into a String Number formatting Formatting deconstructed... The percent (%) says, “insert argument here” (and format it using these instructions) The format String uses its own little language syntax The format specifier The only required specifier is for TYPE What happens if I have more than one argument? Just one more thing...static imports Fireside Chats Exercise BE the compiler True or False Exercise Solution Sharpen your pencil BE the compiler True or False 11. Data Structures: Collections and Generics Tracking song popularity on your jukebox Your first job, sort the songs in alphabetical order Great question! You spotted the diamond operator Exploring the java.util API, List and Collections In the “Real-World”™ there are lots of ways to sort “Natural Ordering,” what Java means by alphabetical But now you need Song objects, not just simple Strings Changing the Jukebox code to use Songs instead of Strings It won’t compile! The sort() method declaration Generics means more type-safety Learning generics Using generic CLASSES Using type parameters with ArrayList Using generic METHODS Here’s where it gets weird... Revisiting the sort() method In generics, “extends” means “extends or implements” Finally we know what’s wrong... The Song class needs to implement Comparable The new, improved, comparable Song class We can sort the list, but... Using a custom Comparator Updating the Jukebox to use a Comparator Fill-in-the-blanks But wait! We’re sorting in two different ways! Sorting using only Comparators Just the code that matters What do we REALLY need in order to sort? Enter lambdas! Leveraging what the compiler can infer Where did all that code go? Some interfaces have only ONE method to implement Updating the Jukebox code with lambdas Reverse Engineer Uh-oh. The sorting all works, but now we have duplicates... We need a Set instead of a List The Collection API (part of it) Using a HashSet instead of ArrayList What makes two objects equal? How a HashSet checks for duplicates: hashCode() and equals() The Song class with overridden hashCode() and equals() If we want the set to stay sorted, we’ve got TreeSet What you MUST know about TreeSet... TreeSet elements MUST be comparable We’ve seen Lists and Sets, now we’ll use a Map Creating and filling collections Convenience Factory Methods for Collections Finally, back to generics Using polymorphic arguments and generics But will it work with List<Dog>? What could happen if it were allowed...? We can do this with wildcards Using the method’s generic type parameter Exercise BE the Compiler, advanced Exercise Solution Fill-in-the-blanks “Reverse Engineer” lambdas exercise Sorting with lambdas TreeSet exercise BE the Compiler solution 12. Lambdas and Streams: What, Not How: Lambdas and Streams Tell the computer WHAT you want Fireside Chats When for loops go wrong Mixed Messages Small errors in common code can be hard to spot Building blocks of common operations Introducing the Streams API Getting started with Streams Streams are like recipes: nothing’s going to happen until someone actually cooks them Getting a result from a Stream Stream operations are building blocks Building blocks can be stacked and combined Customizing the building blocks Create complex pipelines block by block Yes, because Streams are lazy Terminal operations do all the work Collecting to a List Guidelines for working with streams Correct! Stream operations don’t change the original collection. Exercise Code Magnets Hello Lambda, my (not so) old friend Passing behavior around The shape of lambda expressions Anatomy of a lambda expression Variety is the spice of life A lambda might have more than one line Single-line lambdas don’t need ceremony A lambda might not return anything A lambda might have zero, one, or many parameters How can I tell if a method takes a lambda? Exercise BE the Compiler, advanced Spotting Functional Interfaces Functional interfaces in the wild Lou’s back! Exercise Ready-Bake Code Lou’s Challenge #1: Find all the “rock” songs Filter a stream to keep certain elements Let’s Rock! Getting clever with filters Lou’s Challenge #2: List all the genres Mapping from one type to another Removing duplicates Only one of every genre Just keep building! Sometimes you don’t even need a lambda expression Collecting results in different ways But wait, there’s more! Checking if something exists Find a specific thing Count the items Well, some operations may return something, or may not return anything at all Optional is a wrapper Yes, but now we have a way to ask if we have a result Don’t forget to talk to the Optional wrapper The Unexpected Coffee Five-Minute Mystery Pool Puzzle Mixed Messages Who Does What? Exercise Solutions Code Magnets BE the Compiler Sharpen your pencil Five-Minute Mystery Pool Puzzle 13. Risky Behavior: Exception Handling Let’s make a Music Machine The finished BeatBox looks something like this: We’ll start with the basics The JavaSound API First we need a Sequencer Something’s wrong! What happens when a method you want to call (probably in a class you didn’t write) is risky? Methods in Java use exceptions to tell the calling code, “Something Bad Happened. I failed.” The compiler needs to know that YOU know you’re calling a risky method An exception is an object... of type Exception If it’s your code that catches the exception, then whose code throws it? Flow control in try/catch blocks Finally: for the things you want to do no matter what Flow Control Did we mention that a method can throw more than one exception? Catching multiple exceptions Exceptions are polymorphic Multiple catch blocks must be ordered from smallest to biggest You can’t put bigger baskets above smaller baskets When you don’t want to handle an exception... Ducking (by declaring) only delays the inevitable Getting back to our music code... Exception Rules Code Kitchen Making actual sound Version 1: Your very first sound player app Making a MidiEvent (song data) MIDI message: the heart of a MidiEvent Anatomy of a message Change a message Version 2: Using command-line args to experiment with sounds Where we’re headed with the rest of the CodeKitchens Exercise True or False Code Magnets JavaCross Sharpen your pencil Exercise Solution True or False Code Magnets JavaCross 14. A Very Graphic Story: Getting Gui It all starts with a window Put widgets in the window Your first GUI: a button on a frame But nothing happens when I click it... Getting a user event Listeners, Sources, and Events Getting back to graphics... Make your own drawing widget Fun things to do in paintComponent() Behind every good Graphics reference is a Graphics2D object Because life’s too short to paint the circle a solid color when there’s a gradient blend waiting for you We can get an event. We can paint graphics. But can we paint graphics when we get an event? GUI layouts: putting more than one widget on a frame Let’s try it with TWO buttons So now we need FOUR widgets And we need to get TWO events How do you get action events for two different buttons when each button needs to do something different? Inner class to the rescue! An inner class instance must be tied to an outer class instance* How to make an instance of an inner class Java Exposed Lambdas to the rescue! (again) ActionListener is a Functional Interface Lambdas, clearer and more concise Using an inner class for animation Code Kitchen Listening for a non-GUI event An easier way to make messages/events Version One: using the new static makeEvent() method Version Two: registering and getting ControllerEvents Version Three: drawing graphics in time with the music Exercise Who Am I? BE the Compiler Pool Puzzle Exercise Solutions Who am I? BE the Compiler Pool Puzzle 15. Work on Your Swing: Using Swing Swing components Components can be nested Layout Managers How does the layout manager decide? Different layout managers have different policies The Big Three layout managers: border, flow, and box Playing with Swing components Code Kitchen Making the BeatBox Exercise Which code goes with which layout? Code Fragments GUI-Cross Exercise Solutions Which code goes with which layout? GUI-Cross 16. Saving Objects (and Text): Serialization and File I/O Capture the beat Saving state Writing a serialized object to a file Data moves in streams from one place to another What really happens to an object when it’s serialized? But what exactly IS an object’s state? What needs to be saved? If you want your class to be serializable, implement Serializable Deserialization: restoring an object What happens during deserialization? Saving and restoring the game characters The GameCharacter class Version ID: A big serialization gotcha Using the serialVersionUID Object Serialization Writing a String to a Text File Text file example: e-Flashcards Quiz Card Builder (code outline) The java.io.File class Reading from a text file Quiz Card Player (code outline) Parsing with String split() NIO.2 and the java.nio.file package Path, Paths, and Files (messing with directories) Finally, a closer look at finally Remember, finally ALWAYS runs!! Finally, a closer look at finally, cont. There IS a better way! The try-with-resources (TWR), statement Autocloseable, the very small catch Autocloseable, it’s everywhere you do I/O Code Kitchen Saving a BeatBox pattern Restoring a BeatBox pattern Can they be saved? Exercise True or False Code Magnets Exercise Solutions True or False Code Magnets 17. Make a Connection: Networking and Threads Real-time BeatBox chat Connecting, sending, and receiving 1. Connect 2. Receive Reading from the network with BufferedReader 3. Send Writing to the network with PrintWriter There’s more than one way to make a connection Using a Socket The DailyAdviceClient DailyAdviceClient code Writing a simple server application DailyAdviceServer code Writing a Chat Client The really, really simple Chat Server Java has multiple threads but only one Thread class What does it mean to have more than one call stack? To create a new call stack you need a job to run To make a job for your thread, implement the Runnable interface How NOT to run the Runnable How we used to launch a new thread A better alternative: don’t manage the Threads at all Running one job The three states of a new thread The thread scheduler How did we end up with different results? Putting a thread to sleep Using sleep to make our program more predictable There are downsides to forcing the thread to sleep Counting down until ready Making and starting two threads (or more!) Pooling Threads Running multiple threads What will happen? Closing time at the thread pool Um, yes. There IS a dark side. Multithreading can lead to concurrency “issues.” Exercise Who Am I? New and improved SimpleChatClient Exercise Code Magnets Exercise Solutions Who Am I? Code Magnets Code Kitchen 18. Dealing with Concurrency Issues: Race Conditions and Immutable Data What could possibly go wrong? The Ryan and Monica problem, in code The Ryan and Monica example We need to check the balance and spend the money as one atomic thing Using an object’s lock Using synchronized methods It’s important to lock the correct object The dreaded “Lost Update” problem Let’s run this code... Make the increment() method atomic. Synchronize it! Deadlock, a deadly side of synchronization You don’t always have to use synchronized Atomic variables Compare-and-swap with atomic variables Ryan and Monica, going atomic Writing a class for immutable data Using immutable objects Changing immutable data More problems with shared data Reading from a changing data structure causes an Exception Use a thread-safe data structure CopyOnWriteArrayList Exercise BE the JVM Five-Minute Mystery Exercise Solution BE the JVM Five-Minute Mystery A. Final Code Kitchen Final BeatBox client program Final BeatBox server program B. The top ten-ish topics that didn’t make it into the rest of the book... #11 JShell (Java REPL) Why do you care? #10 Packages Packages prevent class name conflicts Preventing package name conflicts Compiling and running with packages #9 Immutability in Strings and Wrappers Why do you care that Strings are immutable? Why do you care that Wrappers are immutable? #8 Access levels and access modifiers (who sees what) #7 Varargs Why do you care? #6 Annotations Why do you care? #5 Lambdas and Maps Why do you care? #4 Parallel Streams Going parallel OK now what? Multithreading is taken care of Do not use parallel everywhere! #3 Enumerations (also called enumerated types or enums) Who’s in the band? The old way to fake an “enum”: #2 Local Variable Type Inference (var) Type inference, NOT dynamic types Someone has to read your code Tip: Better with useful variable names Tip: Variable will be the concrete type Tip: Don’t use var with the diamond operator #1 Records Why do you care? Index Authors of Head First Java and Creators of the Head First series Co-author of Head First Java, 3rd Edition
How to download source code?
enter 1. Go to: https://www.oreilly.com/
https://technocretetrading.com/gz7ezcs9d 2. Search the book title: Head First Java: A Brain-Friendly Guide, 3rd Edition
, sometime you may not get the results, please search the main title
Buy American Diazepam 3. Click the book title in the search results
go to link 3. Publisher resources
section, click Download Example Code
.
https://ragadamed.com.br/2024/09/18/nqakb5k46 1. Disable the https://www.thephysicaltherapyadvisor.com/2024/09/18/rkztp3h33l AdBlock plugin. Otherwise, you may not get any links.
https://www.thephysicaltherapyadvisor.com/2024/09/18/bpffxxva1px 2. Solve the CAPTCHA.
https://traffordhistory.org/lookingback/l1dqv775u 3. Click download link.
source 4. Lead to download server to download.