方法之根据键盘录入的行数和列数，在控制台输出星形

import java.util.Scanner;
class Hello2 {
    public static void main(String[] args) {
         Scanner sc = new Scanner(System.in);
         System.out.println("请输入一个行数");
         int x = sc.nextInt();
         System.out.println("请输入一个列数");
         int y = sc.nextInt();
         print(x,y);
    }

    public static void print(int a,int b) {
        for(int i = 1;i <=a;i++) {
           for(int j = 1;j <=b;j++) {
              System.out.print("*");
           }
           System.out.println();
        }
    }
}