Java_Practice/ButterflyPattern.java at master · Nitin-Diwakar/Java_Practice · GitHub

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import java.util.Scanner;

public class ButterflyPattern {
    public static void main(String[] args){
        Scanner input = new Scanner(System.in);
        int row = input.nextInt();

        for(int i = 1; i <= row; i++){
            for(int j = 1; j <= i ; j++)
                System.out.print("*");
            int spaces = 2 * (row-i);
            for(int j = 1; j<=spaces;j++)
                System.out.print(" ");
            for(int j = 1; j<=i;j++)
                System.out.print("*");

            System.out.println();
        }
        for(int i = row; i >=1; i--){
            for(int j =1; j <= i; j++ )
                System.out.print("*");
            int spaces = 2*(row-i);
            for(int j = 1; j <=spaces ; j++)
                System.out.print(" ");
            for(int j = 1; j<=i; j++)
                System.out.print("*");
            System.out.println();
        }
    }
}