JAVA Practice Questions
Topics Covered:
Java Basics, OOP, Data Types, Control Structures, Exceptions, Collections, Threads, and more
30 Questions
Practice Questions
1. What is the entry point of a Java program?
2. Which keyword is used to define a class in Java?
3. How do you declare an array of integers in Java?
4. What is the default value of an uninitialized int variable in Java?
5. Which method is used to compare the contents of two strings in Java?
6. What does JVM stand for in Java?
7. Which collection class in Java stores unique elements?
8. Which exception is thrown when dividing by zero in Java?
9. What is the purpose of the 'finally' block in Java exception handling?
10. Which keyword is used to inherit a class in Java?
11. Which keyword is used to implement an interface in Java?
12. Which of the following is NOT a primitive data type in Java?
13. What is the size (in bits) of an int in Java?
14. Which operator is used for string concatenation in Java?
15. Which method is used to start a new thread in Java?
16. Which keyword is used to create a new object in Java?
17. What is the output of the following code snippet?
System.out.println(10 + 20 + "30");
18. Which method converts a String to an int in Java?
19. Which concept allows method overloading in Java?
20. Which keyword prevents a class from being subclassed in Java?
21. What does the 'static' keyword signify when applied to a variable in Java?
22. How do you declare an abstract class in Java?
23. Which interface is used to iterate over a collection in Java?
24. What is the output of the following code snippet?
System.out.println(3 + 4 * 2);
25. Which package contains the core Java classes that are automatically imported?
26. Which of the following is a marker interface in Java?
27. Which loop structure is NOT available in Java?
28. What does the keyword 'this' refer to in a Java class?
29. Which of the following statements about Java is true?
30. Which construct is used for exception handling in Java?
