Groovy Interview Questions

Introduction to Groovy Interview Questions and Answers

Groovy is an object-oriented programming language that is based on the Java platform. It is Java syntax compatible and is from the Apache family of software. It is both static and dynamic language and is similar to Python, Ruby or Perl. Groovy can be used both as a programming language and as a scripting language. It is compatible with JVM bytecode and communicates well with Java code and libraries. The syntax is similar to Java in terms that both use curly brackets. It supports functions such as closures, multiline strings formats and expressions embedded strings. Groovy’ s main power lies in AST transformations which are triggered through annotations.

Most of the valid Java files can also work with Groovy files. These two languages are indeed similar, but the Groovy code is more compact, as it does not need many elements that Java needs. Because of this similarity, Groovy is easy to learn for Java programmers if they start with familiar Java syntax first and then keep on acquiring Groovy programming concepts and syntax.

Now, if you are looking for a job related to Groovy, you need to prepare for the 2021 Groovy Interview Questions. Every interview is different from the different job profiles, but still, to clear the interview, you need to have a good and clear knowledge of Groovy. Here, we have prepared the important Groovy Interview Questions and Answers, which will help you succeed in your interview.

In this 2021 Groovy Interview Questions article, we shall present the 10 most important Groovy interview questions. These questions will help students build their concepts around Groovy and help them ace the interview.

Part 1 – Groovy Interview Questions (Basic)

This first part covers basic Interview Questions and Answers:

1. What do you understand by the concept of thin documentation in Groovy?

Answer:
Thin documentation refers to a lack of proper or detailed documentation. This issue is with many Object-Oriented languages. Groovy programmers often complain about a lack of detailed documentation on the project or code. The documentation is limited in scope, and there is no information or very little information regarding the complex processes and run-time errors.

2. List down some of the advantages of Groovy.

Answer:
As Groovy is an object-oriented programming language used for JVM, it is quite useful. Advantages of groovy are provided below:

• Its syntax is similar to the Java language syntax.
• Because it is based on Java, so it has access to a rich collection of Java libraries.
• It is fully object-oriented.
• It can be easily integrated with the existing interface.
• Groovy code is reusable and assignable.
• Groovy supports operator overloading.
• With Groovy’s declaration of Maps, arrays, ranges, and regular expressions are possible.
• It ensures efficient navigation of objects.

3. Describe the limitations of the Groovy programming language?

Answer:
Limitations are listed below:

• It is a little slower than the many other object-oriented programming languages.
• More memory is required than in other languages.
• Groovy is a little slow while starting up.
• Java dependency is a factor. If one does not know Java, Groovy can be difficult to learn.
• It has thin documentation.

Let us move to the next Groovy Interview Questions.

4. Mention important features that Groovy JDK offers.

Answer:
Some of the important features offered by groovy JDK are provided as follows:

• Collection of literals: -The literal syntax and its initialization are easy and readable I Groovy, whereas in Java, these are difficult and cumbersome.
• Groovy Beans property: – Java lacks direct syntactic support even though it is based on JavaBeans’ concept for structure. In Groovy, a field can be declared as a property or as trivial, and it can access the same too.
• This feature was presented in groovy from the beginning. It was there in its collection framework.
• JDK enhancements: – Many operators and classes and additional methods have also been introduced by the latest versions of Groovy.

5. Explain how a string is expressed in Groovy?

Answer:
A groovy string is called Gstring.

• Groovy string supports double quotes; for regular strings single quote is used.
• G-string may contain Groovy Expressions as in ${}
• Square bracket syntax can also be applied. For Example: charAt(i)

Part 2 – Groovy Interview Questions (Advanced)

This first part covers advanced Interview Questions and Answers.

6. Explain the need for closures and listeners in groovy.

Answer:
Closure in Groovy is defined as the open and anonymous block of code that takes arguments and returns a value that can be assigned to a variable. Thus, closures reference the variables that are declared in the surrounding scope. Groovy does not support anonymous inner classes. With the help of closures, inline listeners can be determined. Listener closures are used as listener adapters in groovy.

7. Provide important differences between Groovy and Java?

Answer:
The important difference between Java and Groovy are as below: –

• Packages and classes in Groovy are imported by default when an application starts or code is executed; the import statement explicitly need not be used.
• In Java, methods are chosencompile-timetime, whereas, in Groovy, methods are chosen at runtime based on the argument type.
• In Groovy, {} block is reserved for closures. Hence array literals cannot be built with this syntax.
• Similar to Java, omitting a modifier on a field does not change a package-private field.
• Groovy does not support Automatic Resource Management or ARM block from Java 7.
• Groovy does not support Java 8 lambdas. It is considered as anonymous inner classes.

8. Explain how comments are written in GroovyDoc?

Answer:
jhujnu8Similar to multiline comments, GroovyDoc comments are also multiline, but there is one difference. A comment starts with a /** and ends with */.

Such comments are related to the following: –

• Type definitions such as classes, interfaces, annotations, and enums definitions
• Methods definitions
• Fields and properties definitions

9. What are the uses of Groovy?

Answer:
Groovy Uses:

• It provides a familiar syntax for Java programmers.
• It can use a rich stock of Java Libraries.
• It can easily integrate with existing infrastructure such as App Servers, Servlet Containers, Loads of databases with JDBC drivers, etc.
• Groovy is fully Object Oriented.
• It provides reusable and assignable pieces of code and is extensible.
• In Groovy, Operators can be overloaded.

10. Mention some of the Groovy applications?

Answer:
Apache Groovy is a powerful approach. It has huge and wide applications in some of the essential modules. When it comes to grouping or adjoining different java modules, Groovy is considered first of all. In combination, size does not matter, actually. Moreover, almost all Java applications currently exist can be extended via Groovy, which is too easy. Groovy’s ability to develop Java-based applications without any error is probably its most unique selling point. Apart from this, several other Groovy applications are quite common. A lot of developers highly prefers it.

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