DELEGATION MODEL

20. Java Program to Validate the TextField for only entering email id using KeyAdapter

            import java.applet.Applet;
            import java.awt.*;
            import java.util.Random;
            import java.util.Timer;
            import java.util.TimerTask;
            
            public class ContinuousDotsApplet extends Applet {
            
                private Random random;
                private int dotCount = 50; // Number of dots to display
                private int[][] dotPositions; // Array to store dot positions
            
                
                public void init() {
                    // Initialize random generator and dot positions array
                    random = new Random();
                    dotPositions = new int[dotCount][2];
            
                    // Set a timer to update dot positions and repaint periodically
                    Timer timer = new Timer();
                    timer.schedule(new TimerTask() {
                        
                        public void run() {
                            updateDots();
                            repaint();
                        }
                    }, 0, 200); // Update every 200 milliseconds (5 times per second)
                }
            
                private void updateDots() {
                    // Update positions of each dot to random coordinates within the applet
                    for (int i = 0; i < dotCount; i++) {
                        dotPositions[i][0] = random.nextInt(getWidth()); // X position
                        dotPositions[i][1] = random.nextInt(getHeight()); // Y position
                    }
                }
            
                
                public void paint(Graphics g) {
                    // Draw each dot as a small filled circle at its random position
                    g.setColor(Color.BLUE);
                    for (int i = 0; i < dotCount; i++) {
                        int x = dotPositions[i][0];
                        int y = dotPositions[i][1];
                        g.fillOval(x, y, 5, 5); // Draw dot with 5x5 size
                    }
                }
            }

OUTPUT

dots