Syntax Quiz - Languages Java

Free practice quiz: Syntax (Languages Java). 51 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This Languages Java practice quiz has 51 multiple-choice questions on Syntax, and 51 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.

Sample questions

1. Which keyword is used to declare a class in Java?

   1. function
   2. class
   3. object
   4. prototype
   Show answer

   Answer: B. class

   In Java, the `class` keyword is used to define a blueprint for creating objects, encapsulating data (fields) and methods (behavior).

2. Which operator is used for equality comparison in Java?

   1. =
   2. ==
   3. !=
   4. >=
   Show answer

   Answer: B. ==

   The double equals sign (`==`) is the equality comparison operator in Java. A single equals sign (`=`) is used for assignment.

3. Which keyword is used to refer to the current instance of a class within a method?

   1. super
   2. this
   3. self
   4. current
   Show answer

   Answer: B. this

   The `this` keyword refers to the current object or instance of the class. It's often used to disambiguate between instance variables and local variables or parameters with the same name.

4. Which operator is used for incrementing a variable by one in Java?

   1. +
   2. ++
   3. --
   4. +=
   Show answer

   Answer: B. ++

   The `++` operator is the increment operator. It increases the value of a variable by 1. The `--` operator is for decrementing.

5. Which keyword is used to make a class or member accessible from any other class?

   1. private
   2. protected
   3. default (no keyword)
   4. public
   Show answer

   Answer: D. public

   The `public` access modifier makes a class, method, or variable accessible from any other class, regardless of its package.

More questions in this quiz

Answers and explanations are in the full quiz.

1. What is the correct syntax for declaring a public static void method named 'main' that accepts an array of strings?
2. Which symbol is used to terminate a statement in Java?
3. What is the correct way to declare an integer variable named 'count' and initialize it to 10?
4. Which of the following is a valid Java identifier?
5. What is the syntax for a single-line comment in Java?
6. Which keyword is used to return a value from a method?
7. What is the correct syntax for creating a new object of a class called 'MyClass'?
8. Which statement correctly declares and initializes a boolean variable 'isActive' to true?
9. What is the correct syntax for accessing a member variable 'name' of an object 'person'?
10. What is the correct way to declare a constant integer named 'MAX_VALUE' and assign it the value 100?
11. Which keyword is used to import a package in Java?
12. What is the correct syntax for a multi-line comment in Java?
13. Which data type is used to store a single character in Java?
14. What is the syntax for an if-else statement in Java?
15. Which keyword is used to create an anonymous inner class?
16. What is the correct way to declare an array of integers named 'numbers' with a size of 5?
17. Which keyword is used to define a method that does not return any value?
18. What is the correct syntax for a do-while loop in Java?
19. What is the syntax for accessing an element at index 2 in an array named 'myArray'?
20. Which operator is used for logical AND in Java?
21. What is the correct syntax for declaring a floating-point variable named 'pi' and initializing it to 3.14?
22. Which keyword is used to inherit from a superclass in Java?
23. What is the syntax for a for loop that iterates from 0 to 9?
24. Which keyword is used to specify that a method belongs to the class itself rather than an instance of the class?
25. What is the correct syntax for a switch statement in Java?
26. Which keyword is used to explicitly call a superclass constructor from a subclass constructor?
27. What is the correct syntax for defining a method that returns an integer and is named 'getValue'?
28. What is the correct syntax for declaring a String variable 'message' and initializing it with 'Hello'?
29. Which keyword is used to declare an abstract method?
30. What is the correct syntax for accessing a static member variable 'count' of a class 'MyClass'?
31. Which keyword is used to indicate that a class cannot be subclassed?
32. What is the correct syntax for an enhanced for loop (for-each loop) in Java for an array of integers 'numbers'?
33. Which keyword is used to define an interface in Java?
34. What is the correct syntax for a while loop in Java?
35. Which keyword is used to implement an interface in Java?
36. What is the correct syntax for a logical OR operator in Java?
37. What is the correct syntax for a try-catch block in Java for exception handling?
38. Which keyword is used to explicitly prevent a method from being overridden by subclasses?
39. What is the correct syntax for a ternary operator in Java, assigning the larger of 'a' and 'b' to 'max'?
40. Which keyword is used to indicate that a method belongs to an interface and must be implemented by implementing classes?
41. What is the correct syntax for asserting that an object 'obj' is not null?
42. What is the correct syntax for casting a double variable 'd' to an integer type?
43. Which keyword is used to define a package for a Java class?
44. What is the correct syntax for accessing a method 'display' of an object 'obj' that returns nothing?
45. Which keyword is used to throw an exception explicitly in Java?
46. What is the correct syntax for declaring a method that accepts two integer parameters, 'a' and 'b', and returns their sum?

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