Java Fundamentals

Test your knowledge of Java syntax,variables,and control structures.

1. What is the entry point of a Java program?

main method start method run method init method

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

class Class object Object

3. What is the default value of an int instance variable?

0 null 1 undefined

4. Which of these is a primitive data type in Java?

String Integer int ArrayList

5. What does the 'static' keyword mean for a method?

Belongs to the class Belongs to the object Can't be overridden Must return void

6. Which operator is used for string concatenation in Java?

+ & && |

7. What is the output of System.out.println(5 + 2 + "Java");?

"7Java" "52Java" "Java7" "Java52"

8. Which loop structure is best for when you don't know the number of iterations in advance?

for while do-while enhanced for

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

extends implements inherit super

10. What is the superclass of all classes in Java?

Object Class Super Root

11. Which of the following are valid Java identifiers?

myVar 1var var-1 $var _var

12. Which keywords are used for access control in Java?

public private protected internal package

13. Which of these are checked exceptions?

NullPointerException IOException ArithmeticException SQLException ClassNotFoundException

14. Which of the following interfaces extend the Iterable interface, allowing traversal with an enhanced for-loop?

Collection List Map Set Queue

15. Which of these are valid ways to create a String in Java?

new String("hello") "hello" String.create("hello") String.valueOf("hello") "hello".intern()

16. Java is a case-sensitive language.

True False

17. The 'final' keyword can be applied to a class, method, and variable.

True False

18. A constructor can return a value.

True False

19. What keyword is used to handle exceptions in Java (starts the block where exceptions may occur)?

20. Name the standard method used to print a line of text to the console (full method name).

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