Java Interview Programs

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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. Wrie 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?