By Venkat Subramaniam
Groovy brings you the easiest of either worlds: a versatile, hugely effective, agile, dynamic language that runs at the wealthy framework of the Java Platform. Groovy preserves the Java semantics and extends the JDK to provide you precise dynamic language features. Programming Groovy 2 can help you, the skilled Java developer, examine and benefit from the most recent model of this wealthy dynamic language. you are going to move from the fundamentals of Groovy to the newest advances within the language, together with strategies for variety checking, tail-call and memoization optimizations, assemble time metaprogramming, and fluent interfaces to create DSLs.
You do not need to depart the wealthy Java Platform to use Groovy. Groovy preserves Java's semantics and extends the JDK, so programming in Groovy appears like the Java language has been augmented; it is like operating with a lighter, extra stylish Java. in case you are an skilled Java developer who desires to learn the way Groovy works, you will discover precisely what you wish during this book.
You'll commence with the basics of programming in Groovy and the way it really works with Java, after which you are going to discover complex techniques similar to unit trying out with mock gadgets, utilizing developers, operating with databases and XML, and growing DSLs. you will grasp Groovy's strong but advanced run-time and compile-time metaprogramming features.
Much has developed within the Groovy language because the book of the 1st variation of Programming Groovy. Programming Groovy 2 might help you study and follow Groovy's new good points. developing DSLs is less complicated now, and Groovy's already-powerful metaprogramming amenities have more advantageous much more. you will see tips on how to paintings with closures, together with tail name optimization and memoization. The booklet additionally covers Groovy's new static compilation feature.
Whether you are studying the fundamentals of the language or drawn to getting informed with the recent gains, Programming Groovy 2 has you covered.
What You Need
To paintings at the examples within the publication you would like Groovy 2.0.5 and Java JDK five or higher.
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Extra info for Programming Groovy 2_ Dynamic Productivity for the Java Developer
Sample text
Tom, Jerry, and null If the excess variable is a primitive type, something that can’t be set to null, then Groovy will throw an exception—this is a new behavior. x. As you can see, Groovy makes it quite easy to send and receive multiple parameters. 6 Implementing Interfaces In Groovy we can morph a map or a block of code into interfaces, which lets us implement interfaces with multiple methods quickly. In this section, you’ll see a Java way of implementing interfaces, and then you’ll learn how to take advantage of Groovy’s facilities.
So, in this case, the expression if (obj) evaluates as t rue only if o bj is not n ull and the collection has at least one element; look at the following code example: lst0 = null println lst0 ? 'lst0 true' : 'lst0 false' lst1 = [1, 2, 3] println lst1 ? 'lst1 true' : 'lst1 false' lst2 = [] println lst2 ? 'lst2 true' : 'lst2 false' We can check our understanding of how Groovy handles boolean for Collections with the following output: lst0 false lst1 true lst2 false Collections are not the only things that receive special boolean treatment.
Lst1 true' : 'lst1 false' lst2 = [] println lst2 ? 'lst2 true' : 'lst2 false' We can check our understanding of how Groovy handles boolean for Collections with the following output: lst0 false lst1 true lst2 false Collections are not the only things that receive special boolean treatment. To see the types that get special treatment and how Groovy evaluates their truth, refer to the following table: Table 1. Types and Their Special Treatment for Boolean Evaluation Type Collection Character Condition for Truth True Not empty Value not 0 CharSequence Enumeration Iterator Length greater than 0 Has more elements Has next Number Map Double value not 0 Not empty At least one match Length greater than 0 Reference not null Boolean Matcher Object[] Any other type In addition to enjoying the built-in Groovy truth conventions, we can write our own boolean conversions easily by implementing an asBoolean method in our classes.
Programming Groovy 2_ Dynamic Productivity for the Java Developer by Venkat Subramaniam
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