Head First Java 3rd：幽默教学的Java编程经典

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"《Head First Java 第三版》(英文版)是一本广受好评的Java编程入门经典教材。本书以其独特、趣味性的教学风格备受赞誉，不仅适合初学者，也对长期从事Java教学的专业人士具有吸引力。作者通过清晰易懂的方式讲解了Java Streams和Lambda表达式等高级概念，将功能性编程的理念融入幽默和时尚元素中，使得学习过程充满乐趣。读者表示，阅读这本书仿佛重新发现了对Java编程的热情，甚至想要从头开始学习。第三版在保留原有优点的基础上，针对2022年的Java技术发展做了更新，涵盖了Java程序员必备的核心知识，包括但不限于基础语法、面向对象编程、集合框架、并发编程以及现代特性如Java Stream API和函数式编程。书中丰富的插图和实例使得复杂概念变得生动可笑，有助于读者轻松理解和记忆。 Dr.Heinz M. Kabutz，一位知名的Java专家，高度评价了这本书，称其为Java学习者的宝藏，尤其是对于那些初次接触Java或希望提升技能的人来说，它是一本不可或缺的参考资料。无论是教学还是个人自学，Head First Java第三版都以其独特的教学方法和深度内容，让学习Java成为一件既有趣又高效的事情。"

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Dedication

From Kathy and Bert:

To our brains, for always being there

(despite shaky evidence)

From Trisha:

To Isra, for always being there

(with a surfeit of evidence)

Table of Contents (the real thing)
1. How to Use This Book: Intro
Your brain on Java. Here you are trying to learn something, while here
your brain is doing you a favor by making sure the learning doesn’t
stick. Your brain’s thinking, “Better leave room for more important
things, like which wild animals to avoid and whether naked
snowboarding is a bad idea.” So how do you trick your brain into
thinking that your life depends on knowing Java?
a. “Who is this book for?”
b. “We know what you’re thinking”
c. “Metacognition: thinking about thinking”
d. “Here’s what WE did:”
e. “Here’s what YOU can do to bend your brain into submission”
f. “What you need for this book:”
g. “Last-minute things you need to know:”
2. Chapter 1
Java takes you to new places. From its humble release to the public as
the (wimpy) version 1.02, Java seduced programmers with its friendly
syntax, object-oriented features, memory management, and best of all—
the promise of portability. We’ll take a quick dip and write some code,
compile it, and run it. We’re talking syntax, loops, branching, and what
makes Java so cool. Dive in.
a. “The way Java works”
b. “What you’ll do in Java”

c. “A very brief history of Java”
d. “Code structure in Java”
e. “Writing a class with a main()”
f. “Simple boolean tests”
g. “Conditional branching”
h. “Coding a serious business application”
i. “Phrase-O-Matic”
j. “Exercise”
k. “Exercise Solutions”
3. Chapter 2
I was told there would be objects. In Chapter 1, we put all of our code
in the main() method. That’s not exactly object-oriented. So now we’ve
got to leave that procedural world behind and start making some objects
of our own. We’ll look at what makes object-oriented (OO)
development in Java so much fun. We’ll look at the difference between
a class and an object. We’ll look at how objects can improve your life.
a. “Chair Wars”
b. “Making your first object”
c. “Making and testing Movie objects”
d. “Quick! Get out of main!”
e. “Running the Guessing Game”
f. “Exercise”
g. “Exercise Solutions”
4. Chapter 3

Variables come in two flavors: primitive and reference. There’s gotta
be more to life than integers, Strings, and arrays. What if you have a
PetOwner object with a Dog instance variable? Or a Car with an
Engine? In this chapter we’ll unwrap the mysteries of Java types and
look at what you can declare as a variable, what you can put in a
variable, and what you can do with a variable. And we’ll finally see
what life is truly like on the garbage-collectible heap.
a. “Declaring a variable”
b. ““I’d like a double mocha, no, make it an int.””
c. “Back away from that keyword!”
d. “Controlling your Dog object”
e. “An object reference is just another variable value”
f. “Life on the garbage-collectible heap”
g. “An array is like a tray of cups”
h. “A Dog example”
i. “Exercise”
j. “Exercise Solutions”
5. Chapter 4
State affects behavior, behavior affects state. We know that objects
have state and behavior, represented by instance variables and
methods. Now we’ll look at how state and behavior are related. An
object’s behavior uses an object’s unique state. In other words,
methods use instance variable values. Like, “if dog weight is less than
14 pounds, make yippy sound, else...” Let’s go change some state!
a. “Remember: a class describes what an object knows and what an
object does”

b. “The size affects the bark”
c. “You can send things to a method”
d. “You can get things back from a method”
e. “You can send more than one thing to a method”
f. “Cool things you can do with parameters and return types”
g. “Encapsulation”
h. “How do objects in an array behave?”
i. “Declaring and initializing instance variables”
j. “Comparing variables (primitives or references)”
k. “Exercise”
l. “Exercise Solutions”
6. Chapter 5
Let’s put some muscle in our methods. You dabbled with variables,
played with a few objects, and wrote a little code. But you need more
tools. Like operators. And loops. Might be useful to generate random
numbers. And turn a String into an int, yeah, that would be cool. And
why don’t we learn it all by building something real, to see what it’s
like to write (and test) a program from scratch. Maybe a game, like
Sink a Startup (similar to Battleship).
a. “Let’s build a Battleship-style game: “Sink a Startup””
b. “Developing a Class”
c. “Writing the method implementations”
d. “Writing test code for the SimpleStartup class”
e. “The checkYourself() method”