how can make the number of rows in the butterfly same as the entry of the user?

I'm fairly new to java, and I'm facing some problems. how can I make the number of rows printed in the butterfly pattern the same as the entry of the user and I was trying to allow the user to enter only odd numbers using if statements but it didn't work for me. any help or advice will be appreciated. thanks!

import java.util.Scanner;
public class Patterns {

    
public void printPattern(int n)
{
    for (int i = 1; i <= n; i++) {
        for (int j = 1; j < i; j++) {
            System.out.print("*");
        }
        System.out.println();
    } System.out.println();
    
    for (int i = 1; i <= n; i++) {
        for (int j = i; j <= n; j++) {
            System.out.print("*");
        }
        System.out.println();
    } System.out.println();
    
    for (int i = 1; i <=n; i++) {
        for(int j = 1; j <= i; j++) {
            System.out.print(" ");
        }
        for (int j = i; j <= n; j++) {
            System.out.print("*");
        }
        System.out.println();
    } System.out.println();
    
    for (int i = 1; i <= n; i++) {
        for (int j = i; j <= n; j++) {
            System.out.print(" ");
        }
        for (int j = 1; j < i; j++) {
            System.out.print("*");
        }
        System.out.println();               
    }System.out.println();
 
}
    
    public void printPattern() {
        
        Scanner scanner = new Scanner(System.in);
        System.out.println("Enter the number of rows needed to print the pattern ");
        int rows = scanner.nextInt();
        System.out.println(" Printing the pattern ");
       
        for (int i=1; i<=rows; i++)
        {
            for (int j = 1; j <= i; j++)
            {
                System.out.print("*");
            }
            for (int k = i*2; k <= rows*2-1; k++)
            {
                System.out.print(" ");
            }
            for (int l = 1; l <= i; l++)
            {
                System.out.print("*");
            }
            System.out.println();
        }
       
        for (int i=1; i<=rows-1; i++)
        {
            for (int j = rows-1; j >= i; j--)
            {
                System.out.print("*");
            }
            for (int k = 1; k <= i*2; k++)
            {
                System.out.print(" ");
            }
            for (int l = rows-1; l >= i; l--)
            {
                System.out.print("*");
            }
           
            System.out.println();
        }
        scanner.close();
        
        
}

 }