Someone

/* Lösung zum Übungsblatt "Tannenbaum" von Dominik Panzer */
class tannenbaum
{

	public static void main (String [] args)
	{
		StdEingabe instream_ref;
		int zeilen = 0;
		int i = 0;
		int j = 0;

		instream_ref = new StdEingabe();

		zeilen = instream_ref.liesIntegerN("Höhe der Baumkrone: ");
		
		if (zeilen < 3 || zeilen > 20)
			return;

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

			System.out.println();

		}

		for (j = 1; j <= zeilen-1; j++)
			System.out.print(" ");
		
		System.out.println("*");

		for (j = 1; j <= zeilen-1; j++)
			System.out.print(" ");
	
		
		System.out.println("*");
	}
}