Java: Find the number of even and odd integers in a given array of integers

Last update on May 09 2025 12:48:31 (UTC/GMT +8 hours)

27. Count even and odd numbers in array

Write a Java program to find the number of even and odd integers in a given array of integers.

Pictorial Presentation:

Sample Solution:

Java Code:

// Import the java.util package to use utility classes, including Arrays.
import java.util.Arrays;

// Define a class named Exercise27.
public class Exercise27 {
    // The main method for executing the program.
    public static void main(String[] args) {
        // Declare and initialize an array of integers.
        int[] array_nums = {5, 7, 2, 4, 9};

        // Print the original array.
        System.out.println("Original Array: " + Arrays.toString(array_nums));

        // Initialize a counter variable for even numbers.
        int ctr = 0;

        // Use a loop to iterate through the array elements and count even numbers.
        for (int i = 0; i < array_nums.length; i++) {
            if (array_nums[i] % 2 == 0)
                ctr++;
        }

        // Print the number of even and odd numbers in the array.
        System.out.println("Number of even numbers : " + ctr);
        System.out.println("Number of odd numbers  : " + (array_nums.length - ctr));
    }
}

Sample Output:

                                                                              
Original Array: [5, 7, 2, 4, 9]                                        
Number of even numbers : 2                                             
Number of odd numbers  : 3 

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Java program to count the number of prime numbers in an array.
• Write a Java program to count the number of negative and positive numbers in an array.
• Write a Java program to find the sum of all even and odd numbers in an array separately.
• Write a Java program to count the number of palindrome numbers in an array.

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