深入学习Java：Head First Java第二版英文原版
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收藏 40.57MB PDF 举报 "Head First Java是第二版的一本英文教材，被广泛认为是学习Java编程的优秀资源，尤其适合初学者。此教材并非扫描版，而是付费电子版，由Sun Microsystems的前董事长、总裁兼CEO Scott McNealy推荐，强调了Java技术在软件开发中的普及性和学习Java的重要性。同时，它得到了IBM Almaden Research Center的Dr. Dan Russell以及Software Development Magazine的Warren Keuffel等专业人士的高度评价，他们赞赏其独特且生动的教学风格，能够将复杂的编程概念以有趣和易于理解的方式呈现出来。"
在"Head First Java"这本书中，作者Kathy Sierra和Bert Bates采用了独特的教学方法，旨在让读者快速、深入地掌握Java编程语言。这本教材不仅关注理论知识，还涵盖了大量实践内容，避免了传统教科书常见的“留给读者的练习”形式，使得学习过程既有趣又实用。书中通过图形化和互动性的设计，使阅读体验更接近于使用图形用户界面（GUI），帮助读者以一种轻松、好奇的心态去探索Java世界。
在内容上，"Head First Java"涵盖了Java语言的基础知识，如变量、数据类型、控制结构（条件语句和循环）、类与对象的概念，以及封装、继承和多态等面向对象编程的核心原则。此外，还深入讲解了异常处理、集合框架、输入输出流、线程并发、网络编程和Java的特殊特性，如对象序列化和网络启动协议等高级主题。
通过本书，读者不仅能了解到Java编程的基本语法，还能掌握如何设计和实现具有实际功能的程序。更重要的是，它培养了读者解决问题和分析问题的能力，使学习者能够逐步成长为熟练的Java开发者。"Head First Java"是一本寓教于乐，全面而深入的Java编程入门教程，无论对于自学还是课堂教学，都是不可多得的资源。
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11
Risky Behavior
Stuff happens. The file isn’t there. The server is down. No matter how good a
programmer you are, you can’t control everything. When you write a risky method, you need
code to handle the bad things that might happen. But how do you know when a method is
risky? Where do you put the code to handle the exceptional situation? In this chapter, we’re
going to build a MIDI Music Player, that uses the risky JavaSound API, so we better find out.
12
A Very Graphic Story
Face it, you need to make GUIs. Even if you believe that for the rest of your
life you’ll write only server-side code, sooner or later you’ll need to write tools, and you’ll
want a graphical interface. We’ll spend two chapters on GUIs, and learn more language
features including Event Handling and Inner Classes. We’ll put a button on the screen,
we’ll paint on the screen, we’ll display a jpeg image, and we’ll even do some animation.
class with a
risky method
class with a
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s
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x
c
e
p
t
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b
a
c
k
class Cow {
void moo() {
if (serverDown){
explode();
}
}
}
your code
your code
class Bar {
void go() {
moo();
}
int stuff() {
x.beep();
}
}
calls risky method
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class MyOuter {
class MyInner {
void go() {
}
}
}
The outer and inner objects
are now intimately linked.
These two objects on the
heap have a special bond. The
inner can use the outer’s
variables (and vice-versa).
i
n
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Your fi rst GUI 355
Getting a user event 357
Implement a listener interface 358
Getting a button’s ActionEvent 360
Putting graphics on a GUI 363
Fun with paintComponent() 365
The Graphics2D object 366
Putting more than one button on a screen 370
Inner classes to the rescue (make your listener an inner class) 376
Animation (move it, paint it, move it, paint it, move it, paint it...) 382
Code Kitchen (painting graphics with the beat of the music) 386
Exercises and puzzles 394
Making a music machine (the BeatBox) 316
What if you need to call risky code? 319
Exceptions say “something bad may have happened...” 320
The compiler guarantees (it checks) that you’re aware of the risks 321
Catching exceptions using a try/catch (skateboarder) 322
Flow control in try/catch blocks 326
The fi nally block (no matter what happens, turn off the oven!) 327
Catching multiple exceptions (the order matters) 329
Declaring an exception (just duck it) 335
Handle or declare law 337
Code Kitchen (making sounds) 339
Exercises and puzzles 348
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