如何快速加入大量的精准客户QQ群并推广自己

IMPORT java.io.BufferedReader;IMPORT java.io.InputStreamReader;public class Square { public static void main(String[] args) { int r; try {BufferedReader in=new BufferedReader(new InputStreamReader(System.in)); System.out.print("请输入要打印的行数:"); String str=in.readLine(); r=Integer.valueOf(str).intValue(); } catch(Exception e) { System.out.println("您输入的数据有误。"); return; } for (int i=1;i<=5;i++) { for(int j=1;j<=5;j++) { System.out.print("*"); } System.out.println(); } }}