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Java Exercises: Find the kth smallest and largest element in a specified array

Java Basic: Exercise-161 with Solution

Write a Java program to find the kth smallest and largest element in a given array. Elements in the array can be in any order.

Pictorial Presentation:

Java Basic Exercises: Find the kth smallest and largest element in a specified array.

Sample Solution:

Java Code:

import java.util.*;
public class Solution {
  public static void main(String[] args) 
    {
        Integer arr[] = new Integer[]{1, 4, 17, 7, 25, 3, 100};
        int k = 2;
		System.out.println("Original Array: ");
		System.out.println(Arrays.toString(arr));
		System.out.println("K'th smallest element of the said array: ");
        Arrays.sort(arr);       		
        System.out.print(arr[k-1] + " ");
		System.out.println("\nK'th largest element of the said array:");          
        Arrays.sort(arr, Collections.reverseOrder());  		
        System.out.print(arr[k-1] + " ");
	}
}

Sample Output:

Original Array: 
[1, 4, 17, 7, 25, 3, 100]
K'th smallest element of the said array: 
3 
K'th largest element of the said array:
25 

Flowchart:

Flowchart: Java exercises: Find the kth smallest and largest element in a specified array.

Java Code Editor:

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Previous: Write a Java program to find the k smallest elements in a given array. Elements in the array can be in any order.
Next: Write a Java program to find the numbers greater than the average of the numbers of a given array.

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Java: Tips of the Day

Array vs ArrayLists:

The main difference between these two is that an Array is of fixed size so once you have created an Array you cannot change it but the ArrayList is not of fixed size. You can create instances of ArrayLists without specifying its size. So if you create such instances of an ArrayList without specifying its size Java will create an instance of an ArrayList of default size.

Once an ArrayList is full it re-sizes itself. In fact, an ArrayList is internally supported by an array. So when an ArrayList is resized it will slow down its performance a bit as the contents of the old Array must be copied to a new Array.

At the same time, it's compulsory to specify the size of an Array directly or indirectly while creating it. And also Arrays can store both primitives and objects while ArrayLists only can store objects.

Ref: https://bit.ly/3o8L2KH