I've got 8 ovals all set to the same colour. After a second I want the first oval to change colours and then after another second i want the first oval to go back to its original colour and then change the second ovals colour. I've drawn the circles and I've tried implementing a thread but i think it's not executing...

```
import java.awt.Color;
import java.awt.Graphics;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class Circle extends JPanel implements Runnable
{

  Graphics g;

  Thread t = new Thread();

  int[][] fillCircles = new int[8][4];

@Override
public void paintComponent(Graphics g)
{
    this.g = g;
    super.paintComponent(this.g);

    this.g.setColor(new java.awt.Color(237, 54, 26));

    this.g.drawOval(300, 50, 100, 100);
    this.g.drawOval(450, 125, 100, 100);
    this.g.drawOval(500, 250, 100, 100);
    this.g.drawOval(425, 375, 100, 100);
    this.g.drawOval(300, 400, 100, 100);
    this.g.drawOval(175, 350, 100, 100);
    this.g.drawOval(125, 225, 100, 100);
    this.g.drawOval(175, 100, 100, 100);

    this.g.fillOval(300, 50, 100, 100);
    this.g.fillOval(450, 125, 100, 100);
    this.g.fillOval(500, 250, 100, 100);
    this.g.fillOval(425, 375, 100, 100);
    this.g.fillOval(300, 400, 100, 100);
    this.g.fillOval(175, 350, 100, 100);
    this.g.fillOval(125, 225, 100, 100);
    this.g.fillOval(175, 100, 100, 100);

    fillCircles[0][0] = 300;
    fillCircles[0][1] = 50;
    fillCircles[0][2] = 100;
    fillCircles[0][3] = 100;

    fillCircles[1][0] = 450;
    fillCircles[1][1] = 125;
    fillCircles[1][2] = 100;
    fillCircles[1][3] = 100;

    fillCircles[2][0] = 500;
    fillCircles[2][1] = 250;
    fillCircles[2][2] = 100;
    fillCircles[2][3] = 100;

    fillCircles[3][0] = 425;
    fillCircles[3][1] = 375;
    fillCircles[3][2] = 100;
    fillCircles[3][3] = 100;

    fillCircles[4][0] = 300;
    fillCircles[4][1] = 400;
    fillCircles[4][2] = 100;
    fillCircles[4][3] = 100;

    fillCircles[5][0] = 175;
    fillCircles[5][1] = 350;
    fillCircles[5][2] = 100;
    fillCircles[5][3] = 100;

    fillCircles[6][0] = 125;
    fillCircles[6][1] = 225;
    fillCircles[6][2] = 100;
    fillCircles[6][3] = 100;

    fillCircles[7][0] = 175;
    fillCircles[7][1] = 100;
    fillCircles[7][2] = 100;
    fillCircles[7][3] = 100;

}

Circle () {
    t.start();
}

public void run () {

    int circle = 0;

    try {
        for (;;) {

            Thread.sleep(1000);

            if (circle > 0) {
                this.g.setColor(new java.awt.Color(237, 54, 26));
                circle--;
                this.g.fillOval(fillCircles[circle][0], fillCircles[circle][1], fillCircles[circle][2], fillCircles[circle][2]);
                circle++;
            }
            this.g.setColor(Color.red);
            this.g.fillOval(fillCircles[circle][0], fillCircles[circle][1], fillCircles[circle][2], fillCircles[circle][2]);

            circle++;

            if (circle == 8) {
                circle = 0;
            }

        }
    } catch (InterruptedException e) {
        System.out.println ("Thread Interrupted");
    }

}

public static void main(String[] args) {
    Circle c;

    JFrame application = new JFrame();

    application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    application.add(c=new Circle());
    application.setSize(1200, 900);
    application.setVisible(true); 

}

```

}