Groovy Interview Questions

What do you know about JVM (java virtual machine)?

Ans : JVM stands for Java virtual machine and they are considered to be an important component of Groovy runs. So Groovy needs the JVM to perform many java-based tasks. 

What do you mean by Groovy?

Ans : Groovy is basically an object-oriented programming language and it has been a top choice for many programmers to write and execute their Java codes. The reason behind its popularity is its customization features to any extent. And also last but not the least, the best user interface services. So it is very easy to develop applications with the help of the Groovy user interface.

What are the true reasons behind Groovy popularity?

Ans : Here we would like to mention a few reasons behind its popularity among other java programming languages.

• Groovy can be used for scripting like log configuration.
• It is not a fully object-oriented programming language.
• It mainly uses Java libraries and multiple inheritance.
• It offers native support for various markup languages like HTML (hypertext markup language) and XML (extended markup language). 
• It has a public modifier.
• It supports tools like Gradle and Spack 
• It also consists of tools that support other programs to run. For example Grails and Java

Could you please mention the benefits of using Groovy?

Ans : Below are the primary advantages of using Groovy;

• Compile and execute with all the java libraries that include a part of the COAT JAVA installation.
• It offers very light syntax while writing a program
• Offers several examples in the software center.
• Less work is required during the time of processing HIPO files as input.

What are the limitations of the Groovy language?

Ans : Here are the few disadvantages of using the Groovy language:

• Having to use GROOT means not having all the plotting and fitting power associated with ROOT as GROOT is a smaller subset of the ROOTs plotting and fitting.
• Need to know JAVA which is less common for psychic-based analysis

Explain the concept of thin documentation in Groovy?

Ans : This is a very common issue in almost all object-oriented languages. The real problem behind this inaccuracy is that Groovy doesn’t provide detailed documentation on the projects or code. Therefore you will get limited documentation with no information regarding programming codes or run-time errors

How can you run the script in Groovy?

Ans : Running script is a nit a big deal for many programmers. All the plain scripts are very easy to run on a Groovy, and one good thing is that there is no need for programmers to declare any class or methods which consume extra time. At the beginning of any script, that enables the programmers to use import values. This process is very similar to implementing them in a class. In case you want to declare a function outside the class, you can make use of the command “def

Name a few infrastructures that can be used along with Groovy?

Ans :The following are the name of a few infrastructures that can be used along with Groovy;

• App servers
• Servlet (java servlet) containers
• Databases having JDBC drivers
• All other java based programs. 

Do you really think that Groovy is a simple language than others if so give reasons?

Ans : Yes, most of the developers agree that Groovy is a simple language to use and code. The reasons are as follows;

• Users can enjoy a simple declaration of all the arrays, maps as well as ranges. 
• This makes programmers proceed with multiple tasks and they can expect effective outcomes s

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. Is it possible for you to integrate with other applications that are not based on Java?

Ans : Yes, this is possible. However, only one problem with Groovy integration is that it offers limited features that cannot be used to handle complex programming.

. What are the basic requirements for Groovy?

Ans : The primary requirements that are needed for Groovy are as follows:

• The Java 1.4 version.
• The Groovy. Jar 
• The ASM libraries

. What do you mean by Groovy applications?

Ans : Apache Groovy is one of the powerful approaches used in the different modules. The very first thing that comes to mind is adjoining the different modules of java. It doesn't matter the size but they can be easily combined with the different Java modules. In addition to this, all the existing java applications can be extended through Groovy very simply. This process also makes it easier to develop java-based applications without any error. There are several other applications available, but they are quite common.

. What are the features Groovy JDK equipped with?

Ans : Below are the common features that Groovy JDK (java development kit) is equipped with;

• Using Groovy is simple as it does not require any complex things to implement the applications.
• It doesn't matter which operating system you are using and what are the components of the server, it is easily made up to perform various tasks as per the requirements.
• In addition to this, there are other features available to run the application smoothly based on Java. 

. Compare the old version of the Groovy with the new version?

Ans : When it comes to the new version, there are a lot of advanced features that are quite simple to use when compared to the older version. With the help of the new version, it is also possible to stream arrays and objects of object-oriented methods used in the older version. In addition to this, a lot of run time errors have been eliminated at various stages and commands also have been improved for smooth operations.

. Suppose you are running something on Groovy, is it possible for you to add any data or for the classpath?

Ans : The answer would be yes it is possible. To perform this task, a $classpath variable can be considered. Some programmers also build the $HOME- -> a.groovy - ->lib directory for this. It can simply be defined in the $HOME and users can keep up the pace at every stage

. What do you know about listeners and closures in Groovy?

Ans : Groovy does not support all types of asynchronous inner classes. Users need to be more conscious about the class that they are going to use while defining the functions. In the Groovy also, you will get to see two different types of classes, firstly listeners. In the listeners, the closures can be considered as an adapter for the listener that offers no limit for the inner class implementations. Whereas the closures are nothing but a process of determining the actions that are extremely easy to use.

. Is there any limit on appending the jars that are available in the groovy?

Ans : No there is no such limit, programmers can make them available in any number whenever they need them.

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. What is the importance of using ExpendoMeta class in Groovy?

Ans : Expendometa class is a powerful option available in Groovy. With the help of this class, the programmers can able to add and consider properties, constructors, methods, and operations to perform various tasks. By default, ExpendoMeta cannot be inherited and users need to call it whenever they required it. 

The following command is used to declare ExpendoMeta class;

ExpandoMetaClass.enabledglobally()”.

. What factors do you need to take care of while declaring Groovy strings?

Ans : Below are the important factors you need to take care of them;

• All the expressions which are used in Groovy must be declared using the ${}.
• The next step is, it should be joined by double-quotes. 
• However, if the strings are regular, you can use a single quote.
• The Square bracket [] in the Groovy can be applied in a very general manner.
• Also, users need to remember one thing that is Groovy string is also known as Gstring.

. In Groovy, from the database how can you derive a single class?

Ans : This can be done with the help of the following command;

Println “Row; ColumnA = $”.

There is another option that is also available to do so manually but it is a complex one and there are certain sets of modifications required which will never be performed by programmers

. What is querying in Groovy? Why there is a need for it?

Ans : Querying in Groovy is basically an approach that is used to detect whether the set of commands is compatible with the required operations or not. Also, it can be considered when users need to verify or cross-examine something. The Groovy is an approach that has support for the various queries and the same thing can be handled. The primary task of Querying in Groovy is to ensure error-free outcomes under every situation.

. What does the AST stand for?

Ans : AST in Groovy stands for Abstract syntax trees.

. Explain the AST builder in Groovy?

Ans : In DSL (data syntax language), the codes, as well as strings, are extremely useful factors. This type of task is reliable and there is nothing much that the users need to do. While building AST, sometimes this process might take several hours that depend on the exact number of tasks that are under a tree structure and how they are to be handled.

. Can we include one Groovy script into another Groovy?

Ans : Yes, it is possible. To perform this operation, you need to follow the below codes.

Evaluate(new file (“../tools/Tools.groovy”))

Always remember one thing, place the code on the top of the script for copying the contents.

. What do you mean by Groovysh?

. How could you retrieve a single value from a database using the Groovy?

Ans : The following are the command is used to retrieve a single value from a database using the Groovy;

row = sql.firstRow ('select columnA, column from tableName')

println "Row: columnA = $ {row.columnA} and column = ${row.columnB}"

wing are the command is used to retrieve a single value from a database using the Groovy;

. Explain how you can query in Groovy with code example?

Ans : Let’s have a look into a simple example where we can query the database in Groovy:

import groovy.sql.sql


sql = Sql.newInstance ('jdbc: jtds: sqlserver://serverName/dbName-Class;domain=domainName','username','password','net.sourceforge.jtds.jdbc.driver')


sql.eachRow ('select * from tableName') {print "$it.id--${it.firstName} –"  }

. Explain GroovyDoc comment?

Ans : Like other multiline comments, Groovydoc comments are multiline but it starts with a /** and ends with */. These comments are related to

• Type definitions (classes, interfaces, enums, and annotations).
• Fields and properties definition.
• Methods definitions.

. Explain the bitwise operators in Groovy?

Ans : Bitwise operators in Groovy can be implemented on a BYTE or an INT a return and INT. There are four types of bitwise operators in Groovy;

• &: bitwise “and”
• I : bitwise “or”
• A : bitwise “xor”
• ~ : bitwise negation

. When “propertymissing(string) “ method is called?

Ans : The propertymissing(string) method is called when no getter method for a given property can be detected by the Groovy runtime.

nal thoughts:

As per the latest reports, an average salary for any Groovy developer earns Rs. 8, 00, 000, and the salary will increase for an experienced Groovy developer. Groovy is the popular choice of Java program due to its less complexity and coding. In this post, we have listed very important Groovy interview questions with Answres under the supervision of Groovy experts. The companies like PWC, IBM, TCS, Amazon, Facebook, and Instagram are showing keen interest to hire Groovy developers