Crack Interview: Java 8 Coding Questions

In your interview preparation journey, we are here to help you as much we can so that you can crack the interview. Java 8 was officially released in March 18, 2014. It has introduces several new features and improvements to the Java programming language.

These updates have made Java more efficient, concise, and functional. And this updates is now adopting by IT industries. As a result, Java 8 coding questions are commonly asked in job interviews and programming competitions. This article aims to provide you with a list of coding questions for better practice of your java 8 concepts.

Java 8, with its introduction of lambdas, streams, and functional interfaces has now changed the coding approach of developers. Whether you’re fresher or experiences and preparing for a job interview or just willing to enhance your problem-solving skills, the below list of problem will really help you in your journey to begins.

Welcome to a comprehensive exploration of “Java 8 Coding Questions” – a series designed to unravel the intricacies of Java 8 through hands-on coding exercises. Let’s dive into the world of functional programming, lambda expressions, and stream processing as we sharpen our Java 8 skills one coding question at a time.

Number Based Java 8 Programs

1. Java 8 program to reverse an integer using stream.
2. Java 8 program to check Armstrong number using stream.
3. Java 8 program to check given number is prime or not using stream.
4. Java 8 program to print the Fibonacci series using stream.
5. Java 8 program to check Palindrome number using stream.
6. Write a program to find greatest among three integers using Java 8 using stream.
7. Write a program to find sum of digits of a number using Java 8 using stream.
8. Write a program using Java 8 to swap two numbers using stream.
9. Prime factors of a given integer using Java 8 using stream.
10. Perfect number program using Java 8 using stream.
11. Calculate the Average of Integer Array using Java 8.
12. Calculate factorial of given number using Java 8.
13. Java 8 program to check a given number is even or odd.
14. Print first n Prime Number using Java 8.
15. Print Prime Number in a given range using Java 8.
16. Find Smallest number among three using Java 8.
17. Java 8 program to calculate the power.
18. Java 8 program to calculate the square of a given number.
19. Calculate the cube of a given number using Java 8.
20. Calculate the square root of a given number using Java 8.
21. Java 8 program to calculate LCM of given two numbers.
22. Java 8 Program to find GCD or HCF of two numbers.
23. Check given year is a leap year or not using Java 8.
24. Java 8 Program to convert Celsius to Fahrenheit.
25. Java 8 Program to convert Fahrenheit to Celsius.
26. Calculate Simple Interest using Java 8.

String Based Java 8 Program

1. Remove a given character from a String.
2. Java 8 Program to count occurrence of a given character in a String.
3. Java 8 Program to count occurrence of all characters in a String.
4. String Anagram Program using Java 8.
5. String Palindrome Program in Java 8.
6. Check given character is vowel or consonant using Java 8.
7. Check given character is digit or not.
8. Replace the string space with a given character.
9. Lowercase character to uppercase character in String using Java 8.
10. Convert lowercase vowel to uppercase in String using Java 8.
11. Delete all vowels in a given string using Java 8.
12. Count Occurrence Of Vowels & Consonants in a String.
13. Print the highest frequency character in a String using Java 8.
14. Java 8 program to Replace First Occurrence Of Vowel With ‘-‘ in String.
15. Java 8 program to count alphabets, digits and special characters.
16. Java 8 program to remove blank space from string.
17. Java 8 program to Concatenate two strings.
18. Java 8 Program to remove repeated character from string.
19. Java 8 program to Calculate sum of integers in string.
20. Java 8 program to print all non repeating character in string.
21. Java 8 Program to sort characters of string in Ascending Order.
22. Java 8 Program to sort character of string in descending order.

Java 8 Coding Questions on Array

1. Find duplicate number in given array using Java 8.
2. Find all pairs whose sum is equal to given number using Java 8.
3. Java 8 Program to find missing number in first array if two array is given.
4. Compare two array is equal in size or not using Java 8.
5. Java 8 Program to find largest and smallest number in array.
6. Java 8 Program to find second highest number in an integer array.
7. Find top two maximum number in array using Java 8.
8. Java 8 program to reverse array.
9. Reverse array without using second array.
10. Java 8 Program to calculate length of an array.
11. Java 8 program to insert an element at end of an Array.
12. Insert element at a given location in Array using Java 8.
13. Java 8 Program to delete element at end of Array.
14. Java 8 Program to delete given element from Array.
15. Java 8 Program to delete element from array at given index.
16. Java 8 Program to find sum of array elements.
17. Java 8 Program to print all even numbers in array.
18. Java 8 Program to print all odd numbers in array.
19. Java 8 program to perform left rotation of array elements by two positions.
20. Java 8 program to perform right rotation in array by 2 positions.
21. Java 8 program to find all pairs in array of integers whose sum is equal to given number.
22. Java 8 Program to remove duplicate elements from array.