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

By Scott Davis

Each recipe in Groovy Recipes starts off with a concise code instance for a fast commence, through in-depth rationalization in simple English. those recipes gets you to-to-speed in a fab surroundings quickly.

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

As an extra bonus, this ebook additionally covers Grails. you may be surprised at how fast you could have a firstclass internet program up and operating from flooring 0. Grails comprises every little thing you wish in one zip file⎯a net server (Jetty), a database (HSQLDB), Spring, Hibernate, even a fab model of Ant referred to as GANT. We hide every little thing from getting a simple web site in position to complex good points that take you past HTML into the realm of internet providers: leisure, JSON, Atom, Podcasting, and lots more and plenty a lot more.

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Groovy blurs the syntactic distinction between Lists and Arrays, allowing you to use the style that is most pleasing to you. each{lang -> println lang } ===> Java Groovy JRuby Iterating through a List is such a common activity that Groovy gives you a convenient way to do it. In the first example, you use the default name for the iterator variable, it. In the second example, you explicitly name the variable lang. Of course, all the traditional Java ways of iterating over a List are still available to you.

Class returns null instead of the class type. Why? Because your Map doesn’t contain an element named class. getClass(). Of course, getClass() works across all classes, so this might be the safest form of the call to make if you want it to work 100% of the time. For more information, see the sidebar on page 73. kid2 = "Susie" ===> {dad=John, mom=Jane, kid=Timmy, kid2=Susie} You can use the traditional Java put() method to add an element to the Map. Groovy shortens this to the same dotted notation you use for getting elements.

CompareTo(b) This syntactic sugar shows up throughout the GDK5 (Groovy enhancements to the JDK). List. add("foo")) or in the new Groovy way (list << "foo"). Of course, you can add these methods to your own classes as well. leftShift(item) becomes order << item in Groovy. DATE, 7) ever did. 5. groovy:2) //notice that we can call size() //without throwing a NullPointerException //thanks to the safe dereferencing ? size() ===> null Null references can appear unexpectedly. doSomething(); } This is tedious (and verbose) if receiving a null reference isn’t as catastrophic as the compiler would like you to believe.

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