题解 | #牛牛的字符菱形#

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        //输入你要打印的字符
        Scanner in = new Scanner(System.in);
        char c1 = in.next().charAt(0);
        int n = 3;
        for (int i = 1; i <= n; i++) {
            //打印空白
            for (int j = 1; j <= n - i; j++) {
                System.out.print(" ");
            }
            //打印你输入的字符
            for (int k = 1; k <= 2 * i - 1; k++) {
                System.out.print(c1);
            }
            System.out.print("\n");
        }
        //开始打印下面的
        for (int i1 = 1; i1 <= n - 1; i1++) {
            for (int j1 = 1; j1 <= i1; j1++) {
                System.out.print(" ");
            }
            for (int k1 = 1; k1 <= n - 2 * (i1 - 1); k1++) {
                System.out.print(c1);
            }
            System.out.print('\n');
        }


    }
}

好好去研究