Question

用java打印一个矩形

输入矩形的边长，比如5，打印如图的空心矩形。 ***** * * * * * * *****

Answer 1

你好，是这样吗？import java.util.Scanner;
public class Demo1 {
public static void main(String agrs[]) {
Scanner input = new Scanner(System.in);
System.out.println("请输入行数");
int count = input.nextInt();
int num[] = new int[count];
for (int i = 0; i < num.length; i++) {
System.out.print("*");
}
System.out.println("");
for (int j = 0; j < num.length - 2; j++) { for (int i = 0; i < num.length; i++) {
if (i == 0 || i == num.length - 1) {
System.out.print("*");
} else {
System.out.print(" ");
}
}
System.out.println(" ");
}
for (int i = 0; i < num.length; i++) {
System.out.print("*");
}
}
}