BASIC (Mostly Practice in LABS)

1. Hello World / Basic I/O Program

• Simple input output using Scanner.

2. Check Even or Odd

• Number system basics.

3. Check Prime Number

• Most repeated program.

4. Fibonacci Series

• Iterative + Recursive (viva favourite).

5. Factorial of a Number

• Iterative + Recursive.

6. Palindrome Number 

• Reverse number logic. ( 121, 11, 99 )

7. Armstrong Number

• 153 → 1³ + 5³ + 3³ = 153.

8. Reverse a Number

• Loop + logic building.

9. Sum of Digits

• Simple while loop.

10. Swap Two Numbers

• With third variable + without third variable.

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Strings (Most Asked in Viva)

11. Check Palindrome String

• Very common.

12. Count Vowels & Consonants in String

13. Reverse a String

• Without using inbuilt methods.

14. Find Frequency of Characters in String

• Interview-level logic.

15. Remove Whitespaces From String

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Arrays (High Scoring Questions)

16. Find Largest & Smallest in Array

17. Sort Array

• Bubble sort (most asked)

• Selection sort

• Insertion sort

18. Linear Search & Binary Search

• Binary search viva favourite.

19. Merge Two Arrays

20. Find Duplicate Elements in Array

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Object-Oriented Concepts (Internal Examiner Loves This)

21. Program to Demonstrate Class & Object

22. Inheritance Example

• Single + Multilevel.

23. Method Overloading & Overriding Program

24. Abstract Class Example

25. Interface Example

• Multiple inheritance via interface.

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Exception Handling & File Handling

26. Try–Catch Demo Program

• Divide by zero.

27. Custom Exception Program

28. Read/Write File in Java

• Using FileInputStream & FileOutputStream.

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Collections (New Syllabus Trend)

29. ArrayList Operations

• Add, remove, update, iterate.

30. HashMap Example

• Key-value basic operations.

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🎯 Bonus Programs (Frequently Asked in External Viva)

• Prime numbers in a range

• Matrix addition

• Matrix multiplication

• Pattern printing (star patterns)

• Calculator using switch

• Sort names alphabetically

• Bank Account OOP mini-task

• Thread creation program