Array Problems(JAVA)

Collections of array problems in java are given here. The array is an important concept in the java language, it is used extensively in industry, the question which is based on interviews are mostly included array to some extent. Also, competitive programming includes the data structure for which learning array will be the first step.

This Blog will contain all the basic questions required to learn array.



Questions for practice:-


  • How do you find the missing number in a given integer array of 1 to 100?


  • How do you find the duplicate number on a given integer array?


  • How do you find the largest and smallest number in an unsorted integer array?


  • How do you search a target value in a rotated array?


  • Given an unsorted array of integers, find the length of the longest consecutive elements sequence?


  • How do you find all pairs of an integer array whose sum is equal to a given number?


  • If the input array is [10, 12, 20, 30, 25, 40, 32, 31, 35, 50, 60], your program should be able to find that the subarray lies between indexes 3 and 8.


  • How do you find duplicate numbers in an array if it contains multiple duplicates?


  • How to remove duplicates from a given array in Java?


  • How is an integer array sorted in place using the quicksort algorithm?


  • How do you remove duplicates from an array in place?


  • How do you reverse an array in place in Java?


  • How are duplicates removed from an array without using any library?


  • How to convert a byte array to String?


  • Consider an integer array, the number of elements in which is determined by the user. The elements are also taken as input from the user. Write a program to find those pair of elements that has the maximum and minimum difference among all element pairs.


  • What is the difference between an array and a linked list?


  • How do you perform a binary search in a given array?


  • Take an array of length n where all the numbers are nonnegative and unique. Find the element in the array possessing the highest value. Split the element into two parts where the first part contains the next highest value in the array and second part hold the required additive entity to get the highest value. Print the array where the highest value gets split into those two parts. Sample input: 4 8 6 3 2 Sample output: 4 6 2 6 3 2


  • How to find a median of two sorts arrays?


  • How to rotate an array left and right by a given number K?


  • How do you find duplicates from an unsorted array?


  • Given an array of integers sorted in ascending order, find the starting and ending position of a given value?


  • Given an integer array, find the contiguous subarray (containing at least one number) which has the largest sum and return its sum?


  • Find the third-largest number in a giver array.


  • Find the third-smallest number in a given array.


Important topics for java is given here.

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