Call by value is, when a primitive data type is sent as an argument to the function it returns the data sent by function.
import java.util.Scanner;
public class Even 
{
    static void checknumber (int n)
    {
        if(n%2==0)
            System.out.println("Even");
        else
            System.out.println("Odd");
    }
    public static void main(String[] args) 
    {
        System.out.println("Enter a number");
        Scanner in = new Scanner(System.in);
        int n=in.nextInt();
        Even.checknumber(n);
    }
}
This way you can implement the program.