Java 8 Interview Sample Coding Questions [Solution Improvement in progress]

This repository contains sample Java 8 coding questions that can be used for interview preparation. Each question focuses on a specific programming concept or problem-solving technique using Java 8 features.

List of Questions

1. Separate odd and even numbers in a list of integers

   Given a list of integers, write a Java 8 program to separate the odd and even numbers into two separate lists.

2. Remove duplicate elements from a list using Java 8 streams

   Write a Java 8 program to remove duplicate elements from a list using the stream API and lambda expressions.

3. Find the frequency of each character in a string using Java 8 streams

   Write a Java 8 program to find the frequency of each character in a given string using the stream API and collectors.

4. Find the frequency of each element in an array or a list

   Write a Java 8 program to find the frequency of each element in an array or a list using streams and collectors.

5. Sort a given list of decimals in reverse order

   Write a Java 8 program to sort a given list of decimal numbers in reverse order.

6. Join a list of strings with '[' as prefix, ']' as suffix, and ',' as delimiter

   Given a list of strings, write a Java 8 program to join the strings with '[' as a prefix, ']' as a suffix, and ',' as a delimiter.

7. Print the numbers from a given list of integers that are multiples of 5

   Write a Java 8 program to print the numbers from a given list of integers that are multiples of 5.

8. Find the maximum and minimum of a list of integers

   Given a list of integers, write a Java 8 program to find the maximum and minimum numbers in the list.

9. Merge two unsorted arrays into a single sorted array using Java 8 streams

   Write a Java 8 program to merge two unsorted arrays into a single sorted array using the stream API.

10. Merge two unsorted arrays into a single sorted array without duplicates

    Write a Java 8 program to merge two unsorted arrays into a single sorted array without duplicates.

11. Get the three maximum and three minimum numbers from a given list of integers

    Write a Java 8 program to get the three maximum and three minimum numbers from a given list of integers.

12. Check if two strings are anagrams or not using Java 8 streams

    Write a Java 8 program to check if two strings are anagrams or not using the stream API and lambda expressions.

13. Find the sum of all digits of a number in Java 8

    Write a Java 8 program to find the sum of all digits of a given number.

14. Find the second largest number in an integer array

    Write a Java 8 program to find the second largest number in an integer array.

15. Sort a list of strings according to the increasing order of their length

    Write a Java 8 program to sort a given list of strings according to the increasing order of their length.

16. Find the sum and average of all elements in an integer array

    Write a Java 8 program to find the sum and average of all elements in an integer array.

17. Find the common elements between two arrays

    Write a Java 8 program to find the common elements between two arrays using streams.

18. Reverse each word of a string using Java 8 streams

    Write a Java 8 program to reverse each word of a given string using the stream API and lambda expressions.

19. Find the sum of the first 10 natural numbers

    Write a Java 8 program to find the sum of the first 10 natural numbers using streams.

20. Reverse an integer array

    Write a Java 8 program to reverse an integer array.

21. Print the first 10 even numbers

    Write a Java 8 program to print the first 10 even numbers.

22. Find the most repeated element in an array

    Write a Java 8 program to find the most repeated element in an array.

23. Check if a string is a palindrome using Java 8 streams

    Write a Java 8 program to check if a given string is a palindrome using the stream API and lambda expressions.

24. Find strings in a list that start with a number

    Given a list of strings, write a Java 8 program to find the strings that start with a number.

25. Extract duplicate elements from an array

    Write a Java 8 program to extract duplicate elements from an array.

26. Print duplicate characters in a string

    Write a Java 8 program to print the duplicate characters in a string.

27. Find the first repeated character in a string

    Write a Java 8 program to find the first repeated character in a string.

28. Find the first non-repeated character in a string

    Write a Java 8 program to find the first non-repeated character in a string.

29. Generate the Fibonacci series

    Write a Java 8 program to generate the Fibonacci series.

30. Print the first 10 odd numbers

    Write a Java 8 program to print the first 10 odd numbers.

31. Get the last element of an array

    Write a Java 8 program to get the last element of an array.

32. Calculate the age of a person in years

    Write a Java 8 program to calculate the age of a person in years given their birthday.

33. Extract unique matching strings from String array

    Write a Java 8 program to extract Unique String starting with "#" from the String array Using Java Streams.