java打印菱形的代码怎么写

以下是一个打印菱形的Java代码示例：

import java.util.Scanner;public class DiamondPattern {    public static void main(String[] args) {        Scanner scanner = new Scanner(System.in);        System.out.print("请输入菱形的行数：");        int rows = scanner.nextInt();        int spaces = rows - 1;        int stars = 1;        // 打印上半部分        for (int i = 1; i <= rows; i++) {            for (int j = 1; j <= spaces; j++) {                System.out.print(" ");            }            for (int j = 1; j <= stars; j++) {                System.out.print("*");            }            System.out.println();            spaces--;            stars += 2;        }        // 打印下半部分        spaces = 1;        stars = rows * 2 - 3;        for (int i = 1; i <= rows - 1; i++) {            for (int j = 1; j <= spaces; j++) {                System.out.print(" ");            }            for (int j = 1; j <= stars; j++) {                System.out.print("*");            }            System.out.println();            spaces++;            stars -= 2;        }    }}

运行程序后，会提示输入菱形的行数，输入后即可打印出对应行数的菱形图案。