用Java输出一个棱形

以下是用 Java 输出一个棱形的代码：

import java.util.Scanner;

public class DiamondPattern {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.print("请输入棱形的行数：");
        int rows = sc.nextInt();
        int i, j, space = 1;
        space = rows - 1;
        for (j = 1; j <= rows; j++) {
            for (i = 1; i <= space; i++) {
                System.out.print(" ");
            }
            space--;
            for (i = 1; i <= 2 * j - 1; i++) {
                System.out.print("*");
            }
            System.out.println("");
        }
        space = 1;
        for (j = 1; j <= rows - 1; j++) {
            for (i = 1; i <= space; i++) {
                System.out.print(" ");
            }
            space++;
            for (i = 1; i <= 2 * (rows - j) - 1; i++) {
                System.out.print("*");
            }
            System.out.println("");
        }
    }
}

输入行数为 5，输出结果如下：

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

希望能够帮到您！