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Java Coding Interview Questions: 75+ Most asked Java coding

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Java Coding Questions on Numbers

  1. Program to reverse a number in java with explanation
  2. Armstrong Number Program in Java
  3. Prime Number program in java
  4. Fibonacci series program in Java using iteration
  5. Fibonacci Series Program in Java using Recursion
  6. Palindrome Program in Java using Iteration
  7. Palindrome Program in Java using Recursion
  8. Find Greatest among three numbers in Java
  9. Sum of digits of Given Number in Java
  10. Java program to sum the digits of a number using recursion
  11. Java Program to Swap two number without using third Variable
  12. Java Program to Swap two number using third Variable
  13. Java Program to find Prime Factor of a given number
  14. Java Program to add two numbers without addition operator
  15. Perfect number program in Java
  16. Java Program to find Average of array
  17. Java Program to Calculate Average of Numbers
  18. Factorial Program in Java using for loop Iterative method
  19. Factorial program in Java using recursion
  20. Even and Odd number Program in Java
  21. Java Program to Print First n Prime Number
  22. Java program to Print Prime Number in Given Range
  23. Java Program to calculate Power using POW() method
  24. Calculate Power Without using POW method in Java
  25. Java Program to Calculate Square of number
  26. Java Program to Calculate the Cube of a Number
  27. Java Program to Calculate Square root of Number
  28. LCM Program in Java with Explanations
  29. H.C.F. or G.C.D. Of Two Number Program in Java
  30. Java Program to find GCD of two Numbers using Recursion
  31. Java Program to Check Given year is leap or not
  32. Convert Celsius into Fahrenheit Program in Java
  33. Convert Fahrenheit into Celsius Program in Java
  34. Calculate Simple Interest Program in Java

Java Coding Questions on String

  1. Java Program to remove a given character from string
  2. Java Program to Count Occurrence of given character in String
  3. Java Program to Check Given Strings are Anagram or not
  4. Java Program to check given string is Palindrome or not
  5. Java Program to check character is Vowel or Consonant
  6. Java Program to check given Character is digit or not
  7. Replace Spaces of String with a Character in Java
  8. Java Program to Convert Lowercase Character to Uppercase Character
  9. Java Program to Convert Lowercase vowel into Uppercase in String
  10. Java Program to remove Vowels from the String
  11. Java Program to Count Vowels and Consonants in the String
  12. Java Program to Print Maximum Occurred Character in String
  13. Java Program to Replace First Occurrence Vowel with ‘-‘ in a String
  14. Java Program to Remove All the blank Spaces in String
  15. Java Program to Concatenate two Strings
  16. Java Program to Remove Duplicates From String
  17. Java Program to Find Sum of Integers in the String
  18. Java Program to Print non Repeating Characters in String
  19. Java Program to Sort String in Ascending Order
  20. Java Program to Sort String Character in Descending order

Java Coding Questions on Array

  1. Java program to Find missing number in array
  2. Java Program to Count the duplicate numbers in an array
  3. Find All Pairs in Array whose Sum is Equal to given number Using Java
  4. Java Program to print first duplicate number in an array of 1-100
  5. Java Program to find the missing number in a second array
  6. Java program to compare two arrays equal or not in size
  7. Java program to find the largest and smallest number in Array
  8. Java program to find Second Largest number in Array
  9. Java Program to find top two Distinct largest number in Array
  10. Java Program to Print Array in Reverse Order
  11. Reverse Array without using Second Array or inplace Reversal Java Program
  12. Java Program to Print Length of an Array
  13. Java Program to Insert Element At the End of Array
  14. Java Program to Insert Element in Array at given Location
  15. Java Program to Delete Element at End of Array
  16. Java Program to Delete a given Element of Array
  17. Java Program to Delete Element of Array At Given Location
  18. Java Program to Find the Sum of Array Elements
  19. Java Program to Print All Even Numbers in Array
  20. Java Program to Print Odd Numbers from Array
  21. Java Program to Perform Left Rotation on Array Elements by Two
  22. Java Program to Perform Right Rotation on Array Elements by Two
  23. Java Program to remove duplicate elements in an array