Java Lambda Expression: Find second largest and smallest element in an Array

Java Lambda Program: Exercise-19 with Solution

Write a Java program to implement a lambda expression to find the second largest and smallest element in an array.

Sample Solution:

Java Code:

import java.util.Arrays;
import java.util.Comparator;

public class Main {
  public static void main(String[] args) {
    // Create an array of integers
    Integer[] nums = {
    System.out.println("Array elements: " + Arrays.toString(nums));
    // Find the second largest element using lambda expression
    Integer secondLargest = Arrays.stream(nums)

    // Find the second smallest element using lambda expression
    Integer secondSmallest = Arrays.stream(nums)

    // Print the results
    System.out.println("Second largest element: " + secondLargest);
    System.out.println("Second smallest element: " + secondSmallest);

Sample Output:

Array elements: [1, 7, 18, 25, 77, 300, 101]
Second largest element: 101
Second smallest element: 7


In the above exercise,

  • Import the necessary classes Arrays and Comparator.
  • In the main method, we create an array of integers named numbers.

To find the second largest element:

  • Use the Arrays.stream method to convert the array into a stream of integers.
  • Apply the distinct operation to remove any duplicate elements.
  • Sort the elements in reverse order using Comparator.reverseOrder().
  • Skip the first element (the largest) using skip(1).
  • Find the first element remaining, which will be the second largest, using findFirst().
  • If the stream is empty, we return null using orElse(null).
  • The result is stored in the variable secondLargest.

To find the second smallest element:

  • Follow a similar process as above, but this time we sort the elements in ascending order using the default comparator.
  • The result is stored in the variable secondSmallest.

Finally, we print the second largest and second smallest elements to the console.


Flowchart: Java  Exercises: Find second largest and smallest element in an Array.

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Java Lambda Exercises Previous: Java program to find length of longest and smallest string using lambda expression.
Java Lambda Exercises Next: Sort list of objects with lambda expression.

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