Number of Lines Done Correctly

If there were something in place of "( more stuff goes here )" that printed a line of numStars stars, the program would be finished.

import java.io.*;
//
class starBlock
{
  public static void main (String[] args ) throws IOException
  {
    int numRows;      // the number of Rows
    int numStars;     // the number of stars per row
    int row ;         // current row number, number of star in this row

    BufferedReader userin = new BufferedReader (new InputStreamReader(System.in));
    String inputData;

    // collect input data from user
    System.out.println( "How many Rows?" );
    inputData = userin.readLine();
    numRows   = Integer.parseInt( inputData );

    System.out.println( "How many Stars per Row?" );
    inputData = userin.readLine();
    numStars  = Integer.parseInt( inputData );

    row  =  1;
    while ( row <= numRows )    
    {

      ( more stuff goes here )
      System.out.println();
      row = row + 1;
    }
  }
}

Now you must perform one of the most important tasks in computer programming: ignoring the big problem and looking at a little problem.