怎么运用从键盘输出语句！ public class test { public static void main(String[] args) { int i,j,n; n=7; //怎么样才能运用JAVA的SYSTEM.IN for(j=1;j<=7;j++) { for(i=1;i<=n;i++) System.out.print("1"); System.out.print("\n"); n--; } } }

import
import
import
public class test
{
  public static void main(String[] args)
  {
    int n = 0;
    BufferedReader reader = new BufferedReader( new InputStreamReader( System.in ) );
    System.out.println("Please input an integer value, that is larger than 0.");
    System.out.print("n = ");
    try
    {
      String input = reader.readLine();
      n = Integer.parseInt( input );
    }
    catch ( IOException e )
    {
      e.printStackTrace();
    }
                                    
    if(n&gt;0)
    {
      for(int j=0;j&lt;n;j++)
      {
        for(int i=1;i&lt;=n-j;i++)
          System.out.print("1");
        System.out.print("\n");
      }
    }
  }
}