Multi Threading and Swing

I am having a problem in running two threads in parallel. Each of the threads run fine individually. My requirement is to display 10 balls, a red ball if value is 0 and a green ball if value is 1, one after the other. The data in value is received from an array containing 0s or 1s. I need to run 16 such threads together. I am currently trying with two.

package pkg2; public class mainClass { public static void main(String[] args) { Intermediate frame = new Intermediate(); } } 

The main class calls the intermediate class

package pkg2; import java.awt.Color; import javax.swing.*; public class Intermediate extends JFrame { public Intermediate() { DivScreen ob = new DivScreen(); ob.setBackground(Color.black); ob.divScreen1(16); add(ob); pack(); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setVisible(true); setSize(1370, 740); setResizable(false); } } 

In an intermediate class, an object of DivScreen class is made where all the threading and GUI part is done.

package pkg2; import java.awt.*; import javax.swing.*; public class DivScreen extends Canvas implements Runnable//,ActionListener { Thread t1[]; //threads int i, j; //n=total no. of lines, i=no. of rows, j=no of columns public static int x; // x is now global variable public static int i1 = 0, i2 = 0; //to continue fetching data from last entry public static int c1 = 0, c2 = 0; // to check whether line is working or not public static int y1, y2; // to show red or green balls public static int k1 = 0, k2 = 0; //to draw 10 balls int green, blue, red; //variables for color of lines int arr1[] = {1, 1, 0, 1}; int arr2[] = {1, 0, 1, 0, 1, 0}; public DivScreen() //default. constructor { //setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); Font f = new Font("Arial", Font.BOLD, 30); setFont(f); } public void divScreen1(int m) { t1 = new Thread[2]; //HERE WE HAVE TO PAAS n AS SIZE OF THREAD ARRAY // BUT JUST TO CHECK ITS WORKING WE ARE USING 2 THREADS for (int i = 0; i < 2; i++) { t1[i] = new Thread(this, (i + 1) + "thread"); t1[i].start(); } } public void paint(Graphics g) { g.setColor(Color.white); for (int i = 1; i < 4; i++) { j = i; //j is for horizontal lines g.drawLine(i * 342, 0, i * 342, 740); //i is for vertical lines g.drawLine(0, j * 185, 1370, j * 185); } if (x == 1) { g.setColor(Color.GRAY); g.drawString("Line 1", 150, 50); if (c1 == 0) { g.drawString("Line is not in use", 30, 150); g.setColor(Color.black); g.fillRect(45, 90, 200, 30); } else { g.setColor(Color.black); g.fillRect(30, 120, 250, 30); if (k1 < 10) { if (y1 == 0) { g.setColor(Color.red); } else { g.setColor(Color.green); } g.fillOval(50 + 20 * (k1++), 100, 15, 15); } else { k1 = 0; g.setColor(Color.black); g.fillRect(45, 90, 200, 30); } } } if (x == 2) { g.setColor(Color.gray); g.drawString("Line 2", 460, 50); if (c2 == 0) { g.drawString("Line is not in use", 370, 150); g.setColor(Color.black); g.fillRect(385, 90, 200, 30); } else { g.setColor(Color.black); g.fillRect(370, 120, 250, 30); if (k2 < 10) { if (y2 == 0) { g.setColor(Color.red); } else { g.setColor(Color.green); } g.fillOval(390 + 20 * (k2++), 100, 15, 15); } else { k2 = 0; g.setColor(Color.black); g.fillRect(385, 90, 200, 30); } } } } public void update(Graphics g) { paint(g); } public void run() { while (true) { if (Thread.currentThread().getName().equals("1thread")) { x = 1; int value = 0; // to get value from array while (i1 < 4) { c1 = 1; value = arr1[i1]; //valid is a value containing 1 or 0 i1++; // 1 implies product is OK, 0 implies product not OK System.out.println(value); if (value == 1) { y1 = 1; // we will check its value in paint() function } else { y1 = 0; } SwingUtilities.invokeLater(new Runnable() { @Override public void run() { // TODO Auto-generated method stub repaint(0, 0, 342, 185); } }); try { Thread.sleep(200); } catch (Exception e) { System.out.println(e); } } c1 = 0; SwingUtilities.invokeLater(new Runnable() { @Override public void run() { // TODO Auto-generated method stub repaint(0, 0, 342, 185); } }); try { Thread.sleep(200); } catch (Exception e) { System.out.println(e); } } if (Thread.currentThread().getName().equals("2thread")) { x = 2; int value2 = 0; // to get value from arr2[] while (i2 < 6) { c2 = 1; value2 = arr2[i2]; i2++; System.out.println(value2); if (value2 == 1) { y2 = 1; } else { y2 = 0; } SwingUtilities.invokeLater(new Runnable() { @Override public void run() { // TODO Auto-generated method stub repaint(342, 0, 342, 185); } }); try { Thread.sleep(200); } catch (Exception e) { System.out.println(e); } } c2 = 0; SwingUtilities.invokeLater(new Runnable() { @Override public void run() { // TODO Auto-generated method stub repaint(342, 0, 342, 185); } }); try { Thread.sleep(200); } catch (Exception e) { System.out.println(e); } } } } } 

Please reply if you could find something. Thanks.