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Download PDF by Scott Davis: Groovy Recipes Greasing the Wheels of Java

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 clarification in simple English. those recipes gets you to-to-speed in a fab atmosphere quickly.

You'll see tips on how to accelerate approximately each element of the improvement technique utilizing Groovy. Groovy makes mundane dossier administration initiatives like copying and renaming records trivial. studying and writing XML hasn't ever been more straightforward with XmlParsers and XmlBuilders. Breathe new existence into Arrays, Maps, and Lists with a couple of comfort equipment. yet Groovy does greater than simply ease conventional Java improvement: it brings glossy programming beneficial properties to the Java platform like closures, duck-typing, and metaprogramming.

As an further bonus, this publication additionally covers Grails. you can be surprised at how fast you could have a first class net program up and working from floor 0. Grails comprises every little thing you would like in one zip file⎯a internet server (Jetty), a database (HSQLDB), Spring, Hibernate, even a cool model of Ant known as GANT. We hide every thing from getting a simple site in position to complex gains that take you past HTML into the area of internet providers: relaxation, JSON, Atom, Podcasting, and masses a lot more.

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Objects in dynamically typed languages don’t have to satisfy the “contract” of the interface at compile time; they simply have to respond correctly to method calls at runtime. ) def d = new Duck() Alex Martelli, author of several best-selling Python books, coined the phrase duck typing4 to describe dynamically typed languages. Your variable doesn’t have to be formally declared of type Duck as long as it “walks” like a Duck and “quacks” like a Duck—in other words, it must respond to those method calls at runtime.

The nice thing about asking a class directly for its methods is that it is always up-to-date—Javadocs, on the other hand, can easily get out of sync with the live code. For more on class introspection, see Chapter 10, Metaprogramming, on page 181. At the beginning of this section, we discussed the null message that can be safely ignored if a command has no output. Unfortunately, this is another example of shell output that is more noise than information. each{println it} ... call() is applicable for argument types: ...

If I’m writing a DSL (as discussed in the sidebar on page 43), I tend to use fewer parentheses. If I’m writing more traditional Java/Groovy code, I’ll use them more often. 4 Optional Return Statements String getFullName(){ return "${firstName} ${lastName}" } //equivalent code String getFullName(){ "${firstName} ${lastName}" } The last line of a method in Groovy is an implicit return statement. We can explicitly use the return statement or safely leave it off. So, why are return statements optional?

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