Some help needed please........

Question

You can run your program on the command line by starting a command window, changing the current folder to that folder containing your program, and typing the following:
java Week1GraphicsQ6
You could change your program so that the user can set the number of rows and columns by typing them after the name of the program, e.g.
java Week1GraphicsQ6 20 30
The '20' and '30' are input into your program through the args array, in the main method. In this case, args[0] would store '20' and args[1] would store '30'. But these are still strings - you could turn them into integers using the Integer.parseInt method. Then, the standard way to get them into your class, would be to make a parameterised constructor, that sets the number of rows and columns according to the two integers passed into the constructor. (Currently you only have a default constructor that does not take any parameters).
Can you please explain to me what I have to do to be able to get my program to do this. Frankly speaking, I don't really understand the question. Below is my current working code:
import java.awt.*;
import java.awt.geom.*;
import javax.swing.*;
public class Week1GraphicsQ9 extends JFrame
     int numRows = 5;
     int numCols = 10;
     public static void main(String[] args)
          new Week1GraphicsQ9();
     public Week1GraphicsQ9()
          setTitle("Solution to week 1");
          setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          setSize(500,220);
          setLocation(300,300);
          getContentPane().setBackground(Color.white);
          setVisible(true);
     public Rectangle getRect(int thisRow, int thisCol)
          Rectangle myRect = null;
          if (thisCol < 0 || thisRow < 0 )
               return null;
          if (thisCol >= numCols || thisRow >= numRows )
               return null;
          int width = getWidth() / numCols;
          int height = getHeight() / numRows - 7;
          int x = thisCol * width;
          int y = thisRow * height + 31;
          myRect = new Rectangle (x, y, width, height);
          return myRect;
     public void paint(Graphics g)
          Graphics2D g2 = (Graphics2D)g;
          super.paint(g2);
          for (int i = 0; i < numRows; i++)
               for (int j = 0; j < numCols; j++)
                    g2.setStroke(new BasicStroke(3.0f));
                         g2.draw(getRect(i, j));
            g2.setColor(Color.red);
            Rectangle r;
            r = getRect(0, 0);
            g2.fillOval(r.x, r.y, r.width, r.height);
            r = getRect(3, 2);
            g2.fillOval(r.x, r.y, r.width, r.height);
            g2.setColor(Color.blue);
            r = getRect(0, 4);
            g2.fillOval(r.x, r.y, r.width, r.height);
            r = getRect(4, 6);
            g2.fillOval(r.x, r.y, r.width, r.height);
}Thank you

Answer 1

Can you please explain to me what I have to do to be able to get my program to do this. Frankly speaking, I don't really understand the question. Below is my current working code:You will need to be abit more specific to what part your not understanding, because it is not our job to do all your homework for you.
The '20' and '30' are input into your program through the args array, in the main method. Below is how i extract Integer values from a String value stored in a String array called args.
public static void main(String[] args){
  int val 1;
  int val 2;
  if(args.length == 2){
    try{
      val 1 = Integer.parseInt(args[0]);
      val 2 = Integer.parseInt(args[1]);
    catch(NumberFormatException e){
      System.err.println(e);
      return;
}Mel