Java Programs Frequently Asked In Java Written Test

Here are my list of Java Programs interview questions and answers, which is good to prepare before appearing on any Java interviews. As I said Java coding questions are mostly based on programming, logical analysis and problem solving skill , so better to get it right in first place.

Any way you may be able to solve and find answers of these Java coding questions by yourself and you can get many alternative ways to solve these problem. Some times knowing more than one way to solve any programming question or coding problem in Java also helps to impress interviewer.

The basic programs code asked many times In Java Interviews:

1. How to reverse Singly Linked List?

2. Find out duplicate number between 1 to N numbers?

3. Find out middle index where sum of both ends are equal?

4. Write a singleton class?

5. Write a program to create deadlock between two threads?

6. Write a program to reverse a string using recursive algorithm?

7. Write a program to reverse a number?

8. Write a program to convert decimal number to binary format?

9. Write a program to find perfect number or not?

10. Write a program to implement ArrayList?

11. Write a program to find maximum repeated words from a file?

12. Write a program to find out duplicate characters in a string?

13. Write a program to find top two maximum numbers in a array?

14. Write a program to sort a map by value?

15. Write a program to find common elements between two arrays?

16. How to swap two numbers without using temporary variable?

17. Write a program to print fibonacci series?

18. Write a program to find sum of each digit in the given number using recursion?

19. Write a program to check the given number is a prime number or not?

20. Write a program to find the given number is Armstrong number or not?

21. Write a program to convert binary to decimal number?

22. Write a program to check the given number is binary number or not?

23. Write a program for Bubble Sort in java?

24. Write a program for Insertion Sort in java?

25. Write a program to implement hashcode and equals?

26. How to get distinct elements from an array by avoiding duplicate elements?

27. Write a program to get distinct word list from the given file?

28. Write a program to get a line with max word count from the given file?

29. Write a program to convert string to number without using Integer.parseInt() method?

30. Write a program to find two lines with max characters in descending order?

31. Write a program to find the sum of the first 1000 prime numbers?

32. Find longest substring without repeating characters?

33. Write a program to remove duplicates from sorted array?

34. How to sort a Stack using a temporary Stack?

35. How to Get The Prime Numbers Between a Given Range?

36. Write A Java Program That Prints All The Values Given At Command-Line?

37. Write A Java Program To Count The Number Of Words Present In A String?