MCQs on Groovy Syntax and Structure | Groovy

Groovy is a powerful, dynamic programming language that runs on the Java Virtual Machine (JVM). It’s designed to be concise and easy to learn, offering a flexible syntax for developers familiar with Java or other languages. In this quiz, we will focus on core Groovy concepts like syntax, structure, classes, variables, data types, and basic input/output operations.

MCQs: Groovy Syntax and Structure

Groovy Scripts and Classes

1. Which of the following is the correct way to declare a Groovy class?
   • a) class MyClass { ... }
   • b) Groovy class MyClass { ... }
   • c) def class MyClass { ... }
   • d) class: MyClass { ... }
2. What is the default visibility of a class in Groovy?
   • a) Public
   • b) Private
   • c) Protected
   • d) Package-private
3. How do you define a Groovy script?
   • a) A Groovy script has a .groovy extension.
   • b) A Groovy script uses the groovy keyword.
   • c) A Groovy script is enclosed in curly braces.
   • d) A Groovy script is a class without a main method.
4. In Groovy, how do you create a class with a constructor?
   • a) class MyClass { MyClass() { } }
   • b) class MyClass() { ... }
   • c) class MyClass { def MyClass() { } }
   • d) def class MyClass() { ... }
5. Which of the following is the correct way to instantiate an object of the class Car in Groovy?
   • a) new Car()
   • b) Car.new()
   • c) Car.create()
   • d) Car()

Declaring Variables and Data Types

6. What is the default data type for variables declared with def in Groovy?
   • a) Integer
   • b) String
   • c) Object
   • d) Boolean
7. How do you declare a variable in Groovy that holds an integer value of 5?
   • a) int x = 5
   • b) def x = 5
   • c) Integer x = 5
   • d) def Integer x = 5
8. Which of the following is a valid Groovy data type?
   • a) int
   • b) boolean
   • c) char
   • d) All of the above
9. What keyword is used to declare a constant in Groovy?
   • a) const
   • b) final
   • c) static
   • d) immutable
10. How would you declare a list in Groovy?
    • a) list = []
    • b) def list = [1, 2, 3]
    • c) list = new ArrayList()
    • d) list = (1, 2, 3)

Comments and Code Style

11. How do you write a single-line comment in Groovy?
    • a) /* Comment */
    • b) // Comment
    • c) # Comment
    • d) -- Comment
12. What is the purpose of @Grab annotation in Groovy?
    • a) To import a class
    • b) To grab dependencies dynamically
    • c) To define a package
    • d) To declare variables
13. Which of the following is the correct way to write a multi-line comment in Groovy?
    • a) /* Comment */
    • b) /** Comment **/
    • c) // Comment
    • d) """ Comment """
14. What does the @Override annotation do in Groovy?
    • a) It marks a method as deprecated
    • b) It indicates a method overrides a superclass method
    • c) It marks a class as abstract
    • d) It defines an interface method
15. How would you improve code readability in Groovy?
    • a) Using concise variable names
    • b) Adding comments
    • c) Avoiding excessive nesting
    • d) All of the above

Basic Input and Output

16. What is the correct way to print “Hello, Groovy” in Groovy?
    • a) print "Hello, Groovy"
    • b) println("Hello, Groovy")
    • c) echo "Hello, Groovy"
    • d) System.out.println("Hello, Groovy")
17. In Groovy, what method would you use to read input from the user?
    • a) readLine()
    • b) input()
    • c) System.in.read()
    • d) scanner.nextLine()
18. Which of the following will display the contents of a file in Groovy?
    • a) println new File("file.txt").text
    • b) File.read("file.txt")
    • c) display new File("file.txt")
    • d) print File.open("file.txt")
19. What function is used in Groovy to read a number from input?
    • a) readInt()
    • b) readLine()
    • c) nextInt()
    • d) parseInt()
20. How do you handle exceptions in Groovy?
    • a) try-catch-finally
    • b) catch-throw
    • c) throw-catch
    • d) handle-exception

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