出力直角三角型、逆直角三角形をjavaで記述する

/**
 *   : java         、      
 *   :   
 *   :2019.8.7
 */

       /**
        *         *
        *       ***
        *     *****
        *   *******
        * *********
        */
import java.util.Scanner;
public class Exercies8 {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        System.out.print("    *    ：");
        int size= input.nextInt();
        for (int m = 1; m <= size; m++) {
            for (int n = 1; n <= 2 * (size - m); n++) {
                System.out.print(" ");
            }
            for (int o = 1; o <= 2 * m - 1; o++) {
                System.out.print('*');
            }
            System.out.println();
        }
        /**
         * *
         * ***
         * *****
         * *******
         * *********
         */
        System.out.println();
        for (int a = 1; a <= size; a++) {
            for (int b = 1; b<= 2 * a - 1; b++) {
                System.out.print('*');
            }
            System.out.println();
        }
        /**
         * *********
         * *******
         * *****
         * ***
         * *
         */
        System.out.println();
        for (int c = 1; c<= size; c++) {
            for (int d = 1; d<=1+2*(size-c); d++) {
                System.out.print('*');
            }
            System.out.println();
        }
        /**
         * *********
         *   *******
         *     *****
         *       ***
         *         *
         */
        System.out.println();
        for (int x = 1; x <= size; x++) {
            for (int y = 1; y <= 2 * x - 2;y++){
                System.out.print(" ");
            }
            for (int z = 1; z <= 1+2*(size-x); z++) {
                System.out.print('*');
            }
            System.out.println();
        }
    }
}