programming_grails.pdf

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Programming Grails

Burt Beckwith

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Programming Grails

by Burt Beckwith

Printed in the United States of America.

Published by O’Reilly Media, Inc., 1005 Gravenstein Highway North, Sebastopol, CA 95472.

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Editors: Mike Loukides and Meghan Blanchette

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Interior Designer: David Futato

Illustrator: Robert Romano

May 2013:

First Edition

Revision History for the First Edition:

2013-04-22:

First release

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herein.

ISBN: 978-1-449-32393-6

[LSI]

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Table of Contents

Preface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xi

Introduction to Groovy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Installing Groovy 1

Groovy Console 2

Optional Typing 3

Collections and Maps 4

Properties 5

Using the AST Browser 7

Decompiling with JD-GUI 8

Decompiling with javap 8

Closures 8

Interface Coercion 11

Programmatic Closures 11

Owner, Delegate, and this 12

Groovy’s Contributions in the War Against Verbosity 13

Constructors 14

Checked Exceptions 15

Groovy Truth 15

Semicolons 16

Optional Return 16

Scope 16

Parentheses 16

Default Imports 16

Differences Between Java and Groovy 17

Array Initialization 17

in and def Keywords 17

do/while Loops 17

for Loops 17

iii

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