Java Basics for Beginners

Review your understanding of Java syntax,data types,and control structures.

1. Which of the following is a primitive data type in Java?

String int ArrayList Object

2. Which access modifiers are available in Java?

public private protected internal default (no modifier)

3. Java is a case-sensitive language.

True False

4. What symbol is used to denote a single-line comment in Java?

5. What is the correct signature for the main method in a Java program?

public static void main(String args) public void main(String[] args) public static void main(String[] args) static public void Main(String[] args)

6. Which loop structures are supported in Java?

for while do-while repeat loop

7. Primitive data types in Java can hold the value 'null'.

True False

8. What keyword is used to create an instance of a class?

9. Which operator is used for logical AND in Java?

& && | ||

10. Which statements can exit a loop prematurely?

break continue return exit stop

11. Method overloading allows multiple methods with the same name but different parameters.

True False

12. What is the default value of an uninitialized boolean variable?

13. How do you correctly declare an array of integers in Java?

int[] numbers; int numbers[]; Both A and B int numbers[5];

14. Which of the following are Java keywords?

class interface enum struct goto

15. Static members belong to the class, not individual instances.

True False

16. What is the output of: System.out.println(3 + 4 * 2);

17. Which keyword is used to inherit a class in Java?

extends implements inherits super

18. Which method returns the length of a String?

length() size() getLength() length size

19. Java is a purely object-oriented programming language.

True False

20. What does JVM stand for?

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