题解 | 牛牛的字符菱形

import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        char n = in.next().charAt(0);
        for (int j = 1; j <= 3; j++) {
            for (int i = 2 - j; i >= 0; i--) {
                System.out.print(" ");
            }
            for (int x = 1; x <= j * 2 - 1; x++) {
                System.out.print(n);
            }
            System.out.println();
        }
        for (int j = 1; j <= 3; j++) {
            for (int i = 1; i <= j; i++) {
                System.out.print(" ");
            }
            for (int x = 1; x <= 5 - j * 2; x++) {
                System.out.print(n);
            }
            System.out.println();
        }
    }
}