java造空心菱形

import java.util.Scanner;
@SuppressWarnings({"all"})
public class Test{//记得根据文件名修改
    public static void main(String[] args){
        Scanner input=new Scanner(System.in);
        System.out.println("输入你想要的层数");
        int level = input.nextInt();
        System.out.println("输入你想要的图案");
        char pattern = input.next().charAt(0);
        int half = (level+1)/2;
        int n ;
        if (level%2==0){//判断输入的层数为奇数还是偶数
            n=(level -2)/2;
        }else{
            n = (level -1)/2;
        }
        for (int i = 1; i <= (n+1);i++){
            for(int j =1;j <=  n+1-i;j++){//输入图案前的空白
                System.out.print(" ");
            }
            for (int z =1 ;z <= 2*i-1;z++){//正式勾画菱性
                if(z==1 || z==2*i-1){//只有每行的头和尾才有图案，其他的都是空白
                    System.out.print(pattern);
                }else{
                    System.out.print(" ");
                }

            }
            System.out.println();
        }
        //勾画菱形的下部分
        if(level %2==0){
            for (int c =1;c <= 2*n+1;c++){
                if (c==1 || c==2*n+1){
                    System.out.print(pattern);

                }else{
                    System.out.print(" ");
                }
            }
            System.out.println();
        }
        for (int i= 1 ;i<= n; i++){
            for (int b =1; b<=2*n+1;b++ ){//也是只有每行的头和尾才有图案，其他的都是空白
                if (b == i+1 || b==2*n+1-i){
                    System.out.print(pattern);
                }else{
                    System.out.print(" ");
                }
            }
            System.out.println();
        }
    }
}