輸入n，列印u

package com.jhliu20.real;

import java.util.Scanner;

public class XieChengTest {
    public static void main(String[] args) {
        int n;
        Scanner sc = new Scanner(System.in);
        n = sc.nextInt();
        int height = n * 4;
        char[][] arr = new char[height][height];
        
 
for(int i = 0; i < height - n; i++) {
            for(int j = 0; j < n; j++) {
                arr[i][j] = '*';
            }
            for(int j = height - 1, k = 0; k < n; j--) {
                arr[i][j] = '*';
                k++;
            }
        }
        int f = 1;
        for(int
 
 i = height - n, count = n; i <= height - 1; i++) {
            for(int j = f; j < f + n; j++) {
                arr[i][j] = '*';
            }
            for(int j = height - 1; j > (height) / 2 - 1; j--) {
                arr[i][j] = arr[i][height - j - 1];
            }
            f++;
        }
        
 
for(int i = 0; i < height; i++) {
            for(int j= 0; j < height; j++) {
                System.out.print(arr[i][j] == '*' ? '*' : '.');
            }
            System.out.println("");
        }
    }
}