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Java Array Exercises: Find smallest and second smallest elements of a given array

Java Array: Exercise-41 with Solution

Write a Java program to find smallest and second smallest elements of a given array.

Pictorial Presentation:

Java Array Exercises: Find smallest and second smallest elements of a given array

Sample Solution:

Java Code:

import java.util.*;
import java.lang.*;
public class Main
{
   public static void main (String[] args) 
    {
      int arr[] = {5, 7, -8, 5, 14, 1};
      
      int first_element, second_element, arr_size = arr.length;
 
        /* Return if the array size less than two */
        if (arr_size < 2)
        {
            System.out.println("Array size less than two.");
            return;
        }
 
        first_element = second_element = Integer.MAX_VALUE;
        for (int i = 0; i < arr_size ; i ++)
        {
            /* Update both first and second if current element is smaller than first. */
            if (arr[i] < first_element)
            {
                second_element = first_element;
                first_element = arr[i];
            }
 
            /* Update second if arr[i] is between first and second
               elements.*/
            else if (arr[i] < second_element && arr[i] != first_element)
                second_element = arr[i];
        }
        if (second_element == Integer.MAX_VALUE)
            System.out.println("No second smallest element.");
        else
            System.out.println("The smallest element is " +
                               first_element + " and second Smallest  element is " + second_element +".");
      
    }
}

Sample Output:

                                                                              
The smallest element is -8 and second Smallest  element is 1.

Flowchart:

Flowchart: Find smallest and second smallest elements of a given array

Visualize Java code execution (Python Tutor):


Java Code Editor:

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Previous: Write a Java program to find the two elements from a given array of positive and negative numbers such that their sum is closest to zero.
Next: Write a Java program to segregate all 0s on left side and all 1s on right side of a given array of 0s and 1s.

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Java: Tips of the Day

Different between parseInt() and valueOf() in java?

Well, the API for Integer.valueOf(String) does indeed say that the String is interpreted exactly as if it were given to Integer.parseInt(String). However, valueOf(String) returns a new Integer() object whereas parseInt(String) returns a primitive int.

If you want to enjoy the potential caching benefits of Integer.valueOf(int), you could also use this eyesore:

Integer k = Integer.valueOf(Integer.parseInt("123"))

Now, if what you want is the object and not the primitive, then using valueOf(String) may be more attractive than making a new object out of parseInt(String) because the former is consistently present across Integer, Long, Double, etc.

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