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Butterfly Star Pattern Program in Java  


Program:
*           *
* *       * *
* * *   * * *
* * * * * * *
* * *   * * *
* *       * *
*           *
  • Program:
    public class StarPattern17
    {
        public static void main(String[] args)
        {
            int n = 5;
    
            // upper half
            for(int i = 1; i <= n; i++)
            {
                // star - i
                for(int j = 1; j <= i; j++)
                {
                    System.out.print("*");
                }
                //Spaces - 2 * (n - i)
                for(int j = 1; j <= 2*(n-i); j++)
                {
                    System.out.print(" ");
                }
                //Stars - i
                for(int j = 1; j <= i; j++)
                {
                    System.out.print("*");
                }
                System.out.println();
            }
            // lower half
            for(int i = n - 1; i >= 1; i--)
            {
                // star - i
                for(int j = 1; j <= i; j++)
                {
                    System.out.print("*");
                }
                //Spaces - 2 * (n - i)
                for(int j = 1; j <= 2*(n-i); j++)
                {
                    System.out.print(" ");
                }
                //Stars - i
                for(int j = 1; j <= i; j++)
                {
                    System.out.print("*");
                }
                System.out.println();
            }
        }
    }