使用java语言打印出一个空菱形图案

以下是使用Java语言打印出一个空菱形图案的代码：

import java.util.Scanner;

public class DiamondPattern {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.print("请输入菱形的行数：");
        int rows = sc.nextInt();

        int space = rows - 1;
        for (int i = 1; i <= rows; i++) {
            for (int j = 1; j <= space; j++) {
                System.out.print(" ");
            }
            space--;

            for (int j = 1; j <= 2 * i - 1; j++) {
                if (j == 1 || j == 2 * i - 1) {
                    System.out.print("*");
                } else {
                    System.out.print(" ");
                }
            }
            System.out.println();
        }

        space = 1;
        for (int i = 1; i <= rows - 1; i++) {
            for (int j = 1; j <= space; j++) {
                System.out.print(" ");
            }
            space++;

            for (int j = 1; j <= 2 * (rows - i) - 1; j++) {
                if (j == 1 || j == 2 * (rows - i) - 1) {
                    System.out.print("*");
                } else {
                    System.out.print(" ");
                }
            }
            System.out.println();
        }
    }
}

你可以运行这段代码，输入菱形的行数，然后它将打印出相应的空菱形图案。