用Java实现以下编程

import java.util.Scanner;

public class A {

  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int n = sc.nextInt();
    sc.close();
    for (int i = 1; i <= (n + 1) / 2; i++) {
      for (int j = 0; j < (n + 1) / 2 - i; j++) {
        System.out.print("  ");
      }
      for (int j = 0; j < 2 * i - 1; j++) {
        System.out.print("* ");
      }
      System.out.println();
    }
  }
}

通过修改 MAX_NUM 为 5 7 9

public class Test1
{
    public final int MAX_NUM = 5;
        public static void main(String[] args)
    {
        for (int i=0;i<MAX_NUM  ;i++ )
        {
            for (int j=0;j<=MAX_NUM -i ;j++ )//输出空格随着循环是递减的
            {
                System.out.print(" ");
            }
            for (int k=0;k<=i*2 ;k++ )//输出*号随着外循环是递增的,当k<=i时 只打印三角形的一半,首先k是从0开始的
            {
                System.out.print("*");
            }
            System.out.println();
        }
    }
}

package sample;

import java.util.Scanner;

public class test {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        while (true){
            System.out.println("请输入一个奇数：");
            int odd = input.nextInt();
            if (odd%2 == 0 || odd < 0){
                System.out.println("输入非奇数，请重新输入！");
            }else {
                for (int i = 1; i <= (odd + 1) / 2; i++) {
                    for (int j = 0; j < (odd + 1) / 2 - i; j++) {
                        System.out.print("  ");
                    }
                    for (int j = 0; j < 2 * i - 1; j++) {
                        System.out.print("* ");
                    }
                    System.out.println();
                }
                return;
            }
        }

    }
}