Apache Groovy is an object-oriented programming language for the Java platform. It is developed by Guillaume Laforge (PMC Chair); Jochen Theodorou (Tech Lead); Paul King; Cedric Champeau and designed by James Strachan
Groovy is an object-oriented programming language which is used for Java Virtual Machine. It is a multi-faceted language for Java platform. It was designed by James Strachan in the year 2003. It is dynamic, powerful, and optionally typed with static compilation capability. Its syntax can be familiar and easy to learn. It has the ability to integrate smoothly with any java program. It is a domain specific language aimed at improving developer productivity. It is concise and with the help of this, powerful features including scripting capabilities can be delivered to your application.
Explain why closures and listeners are used in groovy.
The open and anonymous block of code that takes arguments returns a value and can be assigned to a variable is known as a closure in Groovy. It references the variables which are declared in its surrounding scope. We know that anonymous inner classes are not supported by Groovy. Inline listeners can be determined with the help of closures. In groovy, listener closures are used as listener adapters. In this only one method which is of interest is overridden.
Some of the features offered by groovy JDK are as follows:
The collection of literals. The literal syntax and its initialization are natural and highly readable unlike java in which they are cumbersome and unpleasant.
The Groovy Beans property. Although Java is based on the concept of JavaBeans as a structure, still it lacks a direct syntactic support. Whereas, groovy can declare a field as a property as trivial and can access it too.
This feature was presented in groovy since its first release especially in the collection framework.
GDK enhancements. Many operators for many of the classes and various additional methods have also been introduced by groovy.