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Groovy is ...

An agile dynamic language for the Java Platform with many features that are inspired by languages like Python, Ruby and Smalltalk, making them available to Java developers using a Java-like syntax.

Developing web applications , writing shell scripts easily, writing concise, meaningful, test cases using Groovy's JUnit integration, or prototyping and producing real industrial strength applications have never been so concise and groovy.

Groovy works cleanly with all existing Java objects and libraries and compiles straight to Java bytecode in either application development or scripting mode.

// The Greeter class class Greeter
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h3. Groovy...

* is an agile and *dynamic language* for the *Java Virtual Machine*
* builds upon the strengths of Java but has *additional power features* inspired by languages like Python, Ruby and Smalltalk
* makes *modern programming features* available to Java developers with *almost-zero learning curve*
* provides the ability to *statically type check* and *statically compile* your code for robustness and performance
* supports *Domain-Specific Languages* and other compact syntax so your code becomes *easy to read and maintain*
* makes writing shell and build scripts easy with its *powerful processing primitives*, OO abilities and an Ant DSL
* increases developer productivity by *reducing scaffolding code* when developing web, GUI, database or console applications
* *simplifies testing* by supporting unit testing and mocking out-of-the-box
* seamlessly *integrates with all existing Java classes and libraries*
* compiles straight to Java bytecode so you can use it anywhere you can use Java

Experience Groovy 2.2

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Groovy 2.2 is the latest major and stable version of the popular alternative language for the JVM.

To learn more about the novelties, make sure to read the detailed release notes. In a nutshell, Groovy 2.2 offers

  • implicit closure coercion to single-method interfaces and abstract classes
  • a @Memoized transformation to cache the result of side-effect-free method invocations
  • a @BaseScript annotation to define the base script class used by a Groovy script
  • a new DelegatingBaseScript class for easily delegating property access and method calls to a custom object
  • a new log transformation for Log4J2
  • precompiled custom type checking extensions
  • various enhancements to Groovysh, the Groovy command-line shell
  • and various other enhancements and minor improvements, as well as performance improvements

"Groovy is like a super version of Java. It can leverage Java's enterprise capabilities but also has cool productivity features like closures, builders and dynamic typing. If you are a developer, tester or script guru, you have to love Groovy."

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A simple hello world script:

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def name='World'; println "Hello $name!"

A more sophisticated version using Object Orientation:

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class Greet {
  def name
  GreeterGreet(targetwho) {     name = targetwho[0].toUpperCase() +
           + target.substring(1)
             who[1..-1] }
  def salute() {     println "Hello ${name}$name!"   }

// Create a new object
g = new GreeterGreet('world')  // Output create object
g.salute()               // output "Hello World!"

Getting Started


Groovy provides powerful additional :



Enjoy making your code groovier !!!!*

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Leveraging existing Java libraries:

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import static org.apache.commons.lang.WordUtils.*

class Greeter extends Greet {
  Greeter(who) { name = capitalize(who) }

new Greeter('world').salute()

On the command line:

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groovy -e "println 'Hello ' + args[0]" World


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