java实验报告 第一个

import java.util.Scanner;public class TheFirstDemo {    public static void main(String[] args) {        Scanner myinput = new Scanner(System.in);        System.out.print("请输入你想产生的行数：");                int col = myinput.nextInt();        int i,j,k;        for(i=1;i<=col;i++){            for(j=1;j<=col-i;j++)                System.out.print(" ");                        for(k=1;k<=i*2-1;k++){                if(k%2==0)                    System.out.print(" ");                    else                        System.out.print("@");                            }            System.out.println();        }    }}