深入理解Java7：核心技术与多语言编程

Java

programming

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CONTENTS

xiv

12.5 Code metrics with Maven and Jenkins 365

Installing Jenkins plugins 366

■

Making code consistent

with Checkstyle 367

■

Setting the quality bar with FindBugs 369

12.6 Leiningen 372

Getting started with Leiningen 372

■

Leiningen’s

architecture 373

■

Example—Hello Lein 373

REPL-oriented TDD with Leiningen 376

Packaging and deploying with Leiningen 377

12.7 Summary 379

Rapid web development 380

13.1 The problem with Java-based web frameworks 381

Why Java compilation is bad for rapid web development 382

Why static typing is bad for rapid web development 383

13.2 Criteria in selecting a web framework 383

13.3 Getting started with Grails 385

13.4 Grails quick-start project 386

Domain object creation 387

■

Test-driven development 388

Domain object persistence 390

■

Test data creation 391

Controllers 392

■

GSP/JSP views 393

Scaffolding and automatic UI creation 395

Rapid turnaround development 395

13.5 Further Grails exploration 396

Logging 396

■

GORM—object-relational mapping 397

Grails plugins 398

13.6 Getting started with Compojure 399

Hello World with Compojure 399

■

Ring and routes 401

Hiccup 402

13.7 A sample Compojure project—“Am I an Otter or Not?” 403

Setting up “Am I an Otter” 404

■

Core functions in

“Am I an Otter” 406

13.8 Summary 409

Staying well-grounded 410

14.1 What to expect in Java 8 411

Lambdas (a.k.a. closures) 411

Modularization (a.k.a. Jigsaw) 413

www.it-ebooks.info

FOREWORD

xviii

the time. This book shows you how to think about divide-and-conquer and how to

avoid some of the safety flaws.

When I saw the chapter on classloading, I thought they had gone a bit too far. Here

were the tricks that my friends and I had used to create magical code, laid bare for all to

learn! They explain how

javap

works, a little tool that can give you insight into the byte-

code generated by the Java compiler. They also cover the new

invokedynamic

and

explain how it differs from plain reflection.

One chapter that I particularly like is “Understanding performance tuning.” This

is the first book since Jack Shirazi’s Java Performance Tuning that has captured the

essence of how to make your system faster. I can summarize the chapter in three

words: “Measure, don’t guess.” This is the essence of good performance tuning. It’s

impossible for a human to guess which code is slow. Instead of offering a single coding

trick, this chapter explains performance from a hardware perspective. It also shows

you how to measure the performance. An interesting little benchmark tool is their

CacheTester

class, which shows the cost of cache misses.

Part 3 of the book explains polyglot programming on the

JVM

. Java is so much more

than a Java programming language. It’s also a platform on which other languages can run.

We’ve seen an explosion of different types of languages. Some are functional, some are

declarative. Some are ports (Jython and

uby), allowing other languages to run on the

JVM

. Languages can be dynamic (Groovy) or stable (Java and Scala). There are many

reasons to use a non-Java language on the

JVM

. If you’re starting a new project, look at

what’s available before deciding. You might save yourself a lot of boilerplate code.

Ben and Martijn show us three alternative languages: Groovy, Scala, and Clojure. In

my opinion, these are the most viable languages at the moment. The authors describe

the differences between these languages, how they compare to Java, and their special

features. The chapter on each language is just enough to help you figure out which you

should be using, without too much technical detail. Don’t expect a reference manual to

Groovy; do expect insight on which language is the right one for you.

Next, you’ll gain insight into how to do test-driven development and continuous

integration of your system. I found it amusing that the old faithful butler Hudson was

so quickly replaced with Jenkins. In any case, these are essential tools for managing

your project, along with tools like Checkstyle and FindBugs.

Studying this book will help you become a well-grounded Java developer. Not only

that, it will give you tips on how to stay well-grounded. Java is constantly changing. We’ll

see lambdas and modularization in the next version. New languages are being designed;

the concurrency constructs are being updated. Many of the things that you know are

true now might not be true in the future. The lesson is, don’t ever stop learning!

The other day I drove past the petrol station where Ben wanted to buy his beer.

Like so many companies in depressed Greece, it had closed. I never did find out if

they sold beer.

. H

EINZ

ABUTZ

AVA

PECIALISTS

’ N

EWSLETTER

www.it-ebooks.info

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