Java Programs Asked in Interview

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Java is a popular programming language, and questions related to Java are commonly encountered in technical interviews. Here's a compilation of Java programs that are frequently asked in interviews, ranging from basics to more challenging ones.

Well, this page includes the top 30+ frequently asked Java programs in interviews for beginners as well as experienced programmers.

30 Frequently Asked Java Programs in Interviews

All these Java programs have step-by-step explanations along with their output.

Java String Programs with Output

  1. Java Program to Find the First Non-repeated Character in a String
  2. Java Program to Check Palindrome String
  3. Java Program to Find Duplicate Characters in a String
  4. Java Program to Find Duplicate Words in a String
  5. Java Program to Find All the Permutations of a String
  6. Java Program to Count Occurrences of Words in a String
  7. Java Program to Count the Occurrences of Each Character
  8. Java Program to Count Vowels and Consonants in a String
  9. Java program to Count the Number of Duplicate Words in a String
  10. Java Program to Count Number of Words in Given String
  11. Java Program to Count the Number of Occurrences of Substring in a String
  12. Java Program to Count the Occurrences of Each Character in String
  13. Java Program to Merge Two String Arrays
  14. Java Program to Remove Duplicate Words from String
  15. Java Program to Reverse a String(5 ways)
  16. Java Program to Reverse Each Word of a String
  17. Java Program to Swap Two Strings
  18. How to Check if the String Contains Only Digits
  19. How to Check if the String Contains Only Letters
  20. How to Check If the String Contains Only Letters or Digits

Java Array Programs with Output

  1. Java Program to Reverse an Array Without Using Another Array
  2. Java Program to Find Duplicate Elements in an Array
  3. Java Program to Find Largest Number in an Array
  4. Java Program to Check the Equality of Two Arrays

Java Number Programs with Output

  1. Java Program to Find Sum of Natural Numbers
  2. Java Program to Reverse a Number
  3. Java Program to Find Prime Numbers
  4. Java Program to Check Armstrong Number
  5. Java Program to Count the Number of Digits in a Number
  6. Java Program for Prime Numbers Within a Range

Java Programs on OOP (Object-Oriented Programming) with Output

  1. Java Program to Calculate Salary of an Employee
  2. Java Program to Calculate Gross Salary of Employee

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