Groovy Interview Questions

Important Interview Question in Groovy .

• Compare Java with Apache Groovy 

1. Groovy is a scripting language 
2. Less syntax
3. default access modifier is public 
4. automatic getters and setters
5. does not support ARM introduced in java 7
6. allows variable substitution inside double quotes 
7. does not support anonymous inner class , lambda , use closure instead .
8. groovy supports operator overloading 

• What is AST transformations.

 the ability to customize the Abstract Syntax Tree representing your programs before the compiler walks this tree to generate Java bytecode .

• Explain closure in groovy

A closure in Groovy is an open, anonymous, block of code that can take arguments, return a value and be assigned to a variable

{ [closureParameters -> ] statements }

• Explain GRAPE 

Grape stands for the Groovy Adaptable (Advanced) Packaging Engine

Grape helps you download and cache external dependencies from within your script with a set of simple annotations.

@Grab('org.apache.httpcomponents:httpclient:4.2.1')

• What is the use of @GrabResolver 

By default GRAPE uses Maven Central Repository , if we need to add our own repository we can use  @GrabResolver  .