怎么才能形成一个空心矩形java

Question

Scanner sc=new Scanner(System.in);
 System.out.println("请输入行数和列数");
 int x=sc.nextInt();
 int y=sc.nextInt();
 

 for(int i=0;i<y;i++) {
     for(int j=0;j<x;j++) {
         if(i ==0) {
         System.out.print("*");
     }
       else if(i == y -1) {
         System.out.print("*");
     }
     else if(j == 0 || j == y-1) {
         System.out.print("*");
     }
     else {
         System.out.print("");
           }
 }
     System.out.println();
             }
   }

}

Answer 1

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入行数和列数");
        int x = sc.nextInt();
        int y = sc.nextInt();

        for (int i = 0; i < y; i++) {
            for (int j = 0; j < x; j++) {
                if (i == 0 || i == y - 1) {
                    System.out.print("*");
                } else if (j == 0 || j == x - 1) {
                    System.out.print("*");
                } else {
                    System.out.print(" ");
                }
            }
            System.out.println();
        }
    }
}