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I have created a grid in my program. Below is the code used to create the grid. import java.awt.Graphics; import javax.swing.JComponent; import javax.swing.JFrame; class Grid extends JComponent { public void paint(Graphics g) { g.drawRect (10, 10, 800, 500); for (int i = 10; i <= 800; i+= 10) g.drawLine (i, 10, i, 510); for (int i = 10; i <= 500; i+= 10) g.drawLine (10, i, 810, i); } } public class CoreControl { public static void main(String[] a) { JFrame window = new JFrame(); window.setSize(840,560); window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); window.getContentPane().add(new Grid()); window.setVisible(true); } } What I want to do is to create a function which will draw a rectangle (filled with black color) based on the coordinates that I give it. Basically I want to populate certain cells of the grid with black color and my idea is to draw black filled rectangles on the cell coordinates. How do I make this function? I tried making another class called drawRectangle and called it in the main function like so window.getContentPane().add(new drawRectangle()); however that did not work (only drawRectangle shows up and not the grid). I also want to be able to use this function repeatedly to keep creating rectangles. How do I do create this function? Also if you know a better way that I should structure this program please let me know (I am new to Java so I am open to any suggestions).

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