**JAVA PROGRAMS**

**# Java Array Tutorials**

**# Java Array Programs**

➤ Count Even and Odd numbers in an Array

➤ Put Even and Odd Elements in 2 Separate Arrays

➤ Display Even and Odd numbers in an Array

➤ Sum of Even and Odd Numbers in Array in Java

➤ Remove odd numbers from an array java

➤ Count positive negative and zero from Array

➤ Print all negative elements in an array

➤ Separate positive and negative numbers in an array

➤ Find the sum of positive numbers in an array

➤ The cumulative sum of an array in Java

➤ Find numbers that are greater than the given number from an array

➤ Find average and numbers greater than average in array

Program description:- **Write a Java program to count the even and odd numbers in the given array.** Use a method to perform this operation. Take the array, and count even-odd numbers, and display it.

Example1:-

Array = {11, 12, 13, 14, 15}

Count of the even number = 2

Count of the odd number = 3

Example2:-

Array = {-15, -10, -5, 0, 5, 10, 15}

Count of the Even numbers = 3

Count of the Odd numbers = 4

Prerequisite:- Array in Java, find length of array in Java, different ways to print array in Java

In this program, we will take input value for the array from the end-user, but you can take it explicitly. See:- how to take array input in Java. We will use a method to perform the operation. Let us see the program.

**Procedure to develop a Java method to count the odd and even numbers in the given array**,

a) Take an array

b) Take two variables to count the odd and even numbers and initialize it with the value 0. Assume they are oddCount, and evenCount

c) Traverse to the array

d) Check each element of the array whether it is even or not.

e) If it is an even number then increase the value of evenCount variable by 1.

f) Else it is an odd number and increases the value of oddCount variable by 1.

g) Display the resultant value of oddCount and evenCount variables.

## Count Even and Odd Numbers in an Array in Java

import java.util.Scanner; public class ArrayTest { public static void main(String[] args) { // create Scanner class object to take input Scanner scan = new Scanner(System.in); // read size of the array System.out.print("Enter size of the array: "); int n = scan.nextInt(); // create an int array of size n int numbers[] = new int[n]; // take input for the array System.out.println("Enter array elements: "); for (int i = 0; i < n; ++i) { numbers[i] = scan.nextInt(); } // count odd-even countOddEven(numbers); // close Scanner scan.close(); } // method to count odd and even numbers // in a given array and display it public static void countOddEven(int[] arr) { // variables int oddCount = 0; int evenCount = 0; // traverse the array for (int i = 0; i < arr.length; ++i) { if (arr[i] % 2 == 0) // even ++evenCount; else // odd ++oddCount; } // display result System.out.println("Count of the Even numbers = " + evenCount); System.out.println("Count of the Odd numbers = " + oddCount); } }

Output:-

Enter the size of the array: 5

Enter array elements:

11 12 13 14 15

Count of the Even numbers = 2

Count of the Odd numbers = 3

Enter the size of the array: 7

Enter array elements:

-15 -10 -5 0 5 10 15

Count of the Even numbers = 3

Count of the Odd numbers = 4

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