java打印正方形

算法不唯一

/**
实心正方形
****
****
****
****
空心正方形
****
*  *
*  *
****
 */
import java.util.Scanner;

public class TestWork {
	public static void main(String[] args) {
		System.out.println("请输入行数");
		Scanner sc = new Scanner(System.in);
		if (sc.hasNextInt()) {
			int rownum = sc.nextInt();
			if (rownum > 1) {
				System.out.println("实心正方形");
				for (int i = 1; i <= rownum; i++) {
					for (int j = 1; j <=rownum ; j++) {
						System.out.print("*");
					}
					System.out.println();
				}
				System.out.println("空心正方形");
				for (int i = 1; i <= rownum; i++) {
					for (int j = 1; j <= rownum; j++) {
						if (i == 1 || i == rownum) {
							System.out.print("*");
						} else {
							if (j == 1 || j == rownum) {
								System.out.print("*");
							} else {
								System.out.print(" ");
							}
						}
					}
					System.out.println();
				}
			} else {
				System.out.println("请输入大于1的正整数");
			}
		} else {
			System.out.println("请输入大于1的正整数");
		}
	}
}/**
实心正方形
****
****
****
****
空心正方形