Groovy Recipes Greasing the Wheels of Java - download pdf or read online

By Scott Davis

ISBN-10: 0978739299

ISBN-13: 9780978739294

Each recipe in Groovy Recipes starts with a concise code instance for a fast begin, by way of in-depth rationalization in simple English. those recipes gets you to-to-speed in a cool atmosphere quickly.

You'll see how one can accelerate approximately each point of the improvement approach utilizing Groovy. Groovy makes mundane dossier administration initiatives like copying and renaming documents trivial. studying and writing XML hasn't ever been more straightforward with XmlParsers and XmlBuilders. Breathe new lifestyles into Arrays, Maps, and Lists with a couple of comfort tools. yet Groovy does greater than simply ease conventional Java improvement: it brings smooth programming gains to the Java platform like closures, duck-typing, and metaprogramming.

As an further bonus, this ebook additionally covers Grails. you may be surprised at how quick you could have a firstclass net program up and operating from floor 0. Grails comprises every thing you would like in one zip file⎯a net server (Jetty), a database (HSQLDB), Spring, Hibernate, even a cool model of Ant known as GANT. We disguise every little thing from getting a uncomplicated site in position to complex gains that take you past HTML into the realm of net providers: leisure, JSON, Atom, Podcasting, and masses a lot more.

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Groovy is a superset of Java. It is in no way meant to replace Java. In fact, Groovy would not exist without Java. Groovy is meant to be a better Java than Java, while all along supporting your legacy codebase. But Groovy does more than improve the existing language. Groovy introduces new classes such as Closure, Range, and GString. Groovy introduces the concept of safe dereferencing to avoid lengthy null-checking blocks. Groovy offers heredocs—a new special multiline String variable. Overall, Groovy “embraces and extends” Java in a positive way.

Import behaves just as it does in Java source code, allowing you to work with classes in other packages. If you are in the middle of defining a long class and mess up, clear returns you to a :000 state. To wipe an entire session clean, typing purge gets you back to the state you were in when you first started the shell. record saves everything you type to a file, allowing you to “play it back” later. history shows what the shell remembers you typing in. 5 Running the Groovy Console (groovyConsole) $ groovyConsole In addition to a text-based Groovy shell, Groovy also provides a graphical console.

For example, typing groovy xcode, groovy vi, or groovy [your IDE] into a search engine yields a number of hits from various people who have blogged about their successes (as well as their stumbling blocks, of course). 40 Chapter 3 New to Groovy Groovy is meant to complement Java, augment it, and in some cases give it a much needed face-lift. (Java was, after all, released way back in 1995. ) For example, some things that are required in Java are optional in Groovy: semicolons, datatypes, and even exception handling.

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Groovy Recipes Greasing the Wheels of Java by Scott Davis

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