Java - 예제 ) 별찍기 01

 

숫자 입력. 
5 
* 
** 
*** 
**** 
***** 

---------2---------- 

***** 
**** 
*** 
** 
* 

---------3---------- 

    * 
   ** 
  *** 
 **** 
***** 

---------4---------- 

***** 
 **** 
  *** 
   ** 
    *

import java.util.Scanner;

public class Star1_4 {

	public static void main(String[] args) {

		// 1

		Scanner scanner = new Scanner(System.in);

		System.out.println("숫자 입력.");

		int a = scanner.nextInt();

		for (int i = 0; i < a; i++) {

			String star = new String();

			for (int j = 0; j <= i; j++) {

				star += "*";

			}

			System.out.println(star);

		}

		System.out.println();
		System.out.println("---------2----------");
		System.out.println();

		// 2

		for (int i = 0; i < a; i++) {

			String star = new String();

			for (int j = a; j > i; j--) {

				star += "*";

			}

			System.out.println(star);

		}

		// 3

		System.out.println();
		System.out.println("---------3----------");
		System.out.println();

		for (int i = 0; i < a; i++) {

			String star = new String();

			for (int j = (a - 1); j > i; j--) {

				star += " ";

			}

			for (int j = 0; j <= i; j++) {

				star += "*";

			}

			System.out.println(star);

		}

		System.out.println();
		System.out.println("---------4----------");
		System.out.println();

		for (int i = 0; i < a; i++) {

			String star = new String();

			for (int j = 1; j <= i; j++) {

				star += " ";

			}

			for (int j = a; j > i; j--) {

				star += "*";

			}

			System.out.println(star);

		}

		scanner.close();

	}
}