ButterflyPattern.java

public class ButterflyPattern {
        public static void main(String[] args) {
            int n = 5;
    
            // Upper half of the diamond
            for (int i = 1; i  <= n; i++) {
                // Print left half of the row
                for (int j = 1; j  <= i; j++) {
                    System.out.print("*");
                }
                // Print spaces in the middle
                for (int j = 1; j  <= 2 * (n - i); j++) {
                    System.out.print(" ");
                }
                // Print right half of the row
                for (int j = 1; j  <= i; j++) {
                    System.out.print("*");
                }
                System.out.println();
            }
    
            // Lower half of the diamond
            for (int i = n; i  >= 1; i--) {
                // Print left half of the row
                for (int j = 1; j  <= i; j++) {
                    System.out.print("*");
                }
                // Print spaces in the middle
                for (int j = 1; j  <= 2 * (n - i); j++) {
                    System.out.print(" ");
                }
                // Print right half of the row
                for (int j = 1; j  <= i; j++) {
                    System.out.print("*");
                }
                System.out.println();
            }
        }
    }