Arrays

Here are 20 problem statements covering various aspects of arrays in Java, ranging from basic to advanced:

1. Initialize Array: Declare an array of integers named numbers with a size of 5 and initialize it with values {1, 2, 3, 4, 5}.

2. Access Element: Print the third element of the array numbers.

3. Modify Element: Change the value of the second element of the array numbers to 10.

4. Array Length: Print the length of the array numbers.

5. Sum of Elements: Calculate and print the sum of all elements in the array numbers.

6. Average of Elements: Calculate and print the average of all elements in the array numbers.

7. Find Maximum: Find and print the maximum element in the array numbers.

8. Find Minimum: Find and print the minimum element in the array numbers.

9. Copy Array: Create a new array copyNumbers and copy all elements from numbers to copyNumbers.

10. Reverse Array: Reverse the elements of the array numbers in-place.

11. Check Existence: Check if the value 6 exists in the array numbers. Print "Found" if it exists, otherwise print "Not found".

12. Sort Array: Sort the elements of the array numbers in ascending order.

13. Merge Arrays: Merge two arrays arr1 = {1, 2, 3} and arr2 = {4, 5, 6} into a new array mergedArray.

14. Count Occurrences: Count and print the number of occurrences of a specific value (e.g., 3) in the array numbers.

15. Remove Element: Remove the element at index 2 from the array numbers.

16. Insert Element: Insert the value 7 at index 2 in the array numbers.

17. Find Duplicate: Find and print all duplicate elements in the array numbers.

18. Rotate Array: Rotate the elements of the array numbers to the left by one position.

19. Find Missing Number: Given an array containing n distinct numbers taken from 0, 1, 2, ..., n, find the one that is missing from the array.

20. Largest Subarray Sum: Given an array of integers, find the contiguous subarray with the largest sum.

These problems cover a wide range of concepts and operations related to arrays in Java, from basic operations like accessing and modifying elements to more advanced tasks like finding duplicates and computing subarray sums.