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    <p>I have added comments where I added/changed the code.</p> <pre><code>import java.awt.BasicStroke; import java.awt.Color; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.MouseEvent; import java.awt.event.MouseListener; import java.awt.event.MouseMotionListener; import java.awt.image.BufferedImage; import javax.swing.ButtonGroup; import javax.swing.ImageIcon; import javax.swing.JButton; import javax.swing.JColorChooser; import javax.swing.JFrame; import javax.swing.JMenu; import javax.swing.JMenuBar; import javax.swing.JMenuItem; import javax.swing.JPanel; import javax.swing.JRadioButton; public class PaintProgram extends JPanel implements MouseListener, ActionListener, /** * CHANGE BY S AQEEL : implement mouse motion listener */ MouseMotionListener { /** * */ private static final long serialVersionUID = 1L; public static int stroke, eraser = 0; private int xX1, yY1, xX2, yY2, choice; /** * CHANGE BY S AQEEL : Define a constant for background color, because we are using it at a lot of places */ private static final Color BACKGROUND_COLOR = Color.WHITE; /** * CHANGE BY S AQEEL : Also define variables for eraser width and height. In a more usable implementation you can allow user to change eraser size */ private int eraserWidth = 40; private int eraserHeight = 40; public static void main(String[] args) { new PaintProgram(); } PaintProgram() { JFrame frame = new JFrame("Paint Program"); frame.setSize(1200, 800); /** * CHANGE BY S AQEEL : Use constant instead of hardcoding */ frame.setBackground(BACKGROUND_COLOR); frame.getContentPane().add(this); JMenuBar menuBar = new JMenuBar(); frame.setJMenuBar(menuBar); JMenu help = new JMenu("Help"); menuBar.add(help); JMenuItem about = new JMenuItem("About"); help.add(about); about.addActionListener(this); JButton button1 = new JButton("Clear"); button1.addActionListener(this); JButton color = new JButton("Color"); color.addActionListener(this); JButton erase = new JButton("Erase?"); erase.addActionListener(this); JButton button2 = new JButton("Empty Rect"); button2.addActionListener(this); JButton button3 = new JButton("Filled oval"); button3.addActionListener(this); JButton button4 = new JButton("Filled Rect"); button4.addActionListener(this); JButton button5 = new JButton("Empty oval"); button5.addActionListener(this); JButton button6 = new JButton("Line"); button6.addActionListener(this); JRadioButton thin = new JRadioButton("Thin Line"); thin.addActionListener(this); JRadioButton medium = new JRadioButton("Medium Line"); medium.addActionListener(this); JRadioButton thick = new JRadioButton("Thick Line"); thick.addActionListener(this); ButtonGroup lineOption = new ButtonGroup(); lineOption.add(thin); lineOption.add(medium); lineOption.add(thick); this.add(button1); this.add(color); this.add(erase); this.add(button2); this.add(button3); this.add(button4); this.add(button5); this.add(button6); this.add(thin); this.add(medium); this.add(thick); addMouseListener(this); frame.setVisible(true); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } public void paintComponent(Graphics g) { super.paintComponent(g); Graphics2D g2 = (Graphics2D) g; if (grid == null) { int w = this.getWidth(); int h = this.getHeight(); grid = (BufferedImage) (this.createImage(w, h)); gc = grid.createGraphics(); gc.setColor(Color.BLUE); } g2.drawImage(grid, null, 0, 0); check(); } BufferedImage grid; Graphics2D gc; public void draw() { Graphics2D g = (Graphics2D) getGraphics(); int w = xX2 - xX1; if (w &lt; 0) w = w * (-1); int h = yY2 - yY1; if (h &lt; 0) h = h * (-1); switch (choice) { case 1: check(); gc.drawRect(xX1, yY1, w, h); repaint(); break; case 2: check(); gc.drawOval(xX1, yY1, w, h); repaint(); break; case 3: check(); gc.drawRect(xX1, yY1, w, h); gc.fillRect(xX1, yY1, w, h); repaint(); break; case 4: check(); gc.drawOval(xX1, yY1, w, h); gc.fillOval(xX1, yY1, w, h); repaint(); break; case 5: if (stroke == 0) gc.setStroke(new BasicStroke(1)); if (stroke == 1) gc.setStroke(new BasicStroke(3)); if (stroke == 2) gc.setStroke(new BasicStroke(6)); gc.drawLine(xX1, yY1, xX2, yY2); repaint(); break; case 6: repaint(); Color temp = gc.getColor(); /** * CHANGE BY S AQEEL : Use constant instead of hardcoding */ gc.setColor(BACKGROUND_COLOR); gc.fillRect(0, 0, getWidth(), getHeight()); gc.setColor(temp); repaint(); break; case 7: if (eraser == 1) { gc.clearRect(xX1, yY1, w, h); } else { } break; } } public void check() { if (xX1 &gt; xX2) { int z = 0; z = xX1; xX1 = xX2; xX2 = z; } if (yY1 &gt; yY2) { int z = 0; z = yY1; yY1 = yY2; yY2 = z; } } public void actionPerformed(ActionEvent e) { /** * CHANGE BY S AQEEL : Remove mousemotionlistener(which is added when eraser is selected) So that if another control is pressed, the user does * not accidentally erases */ super.removeMouseMotionListener(this); if (e.getActionCommand().equals("Color")) { Color bgColor = JColorChooser.showDialog(this, "Choose Background Color", getBackground()); if (bgColor != null) gc.setColor(bgColor); } if (e.getActionCommand().equals("About")) { System.out.println("About Has Been Pressed"); JFrame about = new JFrame("About"); about.setSize(300, 300); JButton picture = new JButton(new ImageIcon("C:/Users/TehRobot/Desktop/Logo.png")); about.add(picture); about.setVisible(true); } if (e.getActionCommand().equals("Empty Rect")) { System.out.println("Empty Rectangle Has Been Selected~"); choice = 1; } if (e.getActionCommand().equals("Empty oval")) { System.out.println("Empty Oval Has Been Selected!"); choice = 2; } if (e.getActionCommand().equals("Filled Rect")) { System.out.println("Filled Rectangle Has Been Selected"); choice = 3; } if (e.getActionCommand().equals("Filled oval")) { System.out.println("Filled Oval Has Been Selected"); choice = 4; } if (e.getActionCommand().equals("Line")) { System.out.println("Draw Line Has Been Selected"); choice = 5; } if (e.getActionCommand().equals("Thin Line")) { stroke = 0; } if (e.getActionCommand().equals("Medium Line")) { stroke = 1; } if (e.getActionCommand().equals("Thick Line")) { stroke = 2; } if (e.getActionCommand().equals("Erase?")) { eraser = 1; choice = 7; /** * CHANGE BY S AQEEL : Add mousemotionlistener here. */ super.addMouseMotionListener(this); } if (e.getActionCommand().equals("Clear")) { System.out.println("Clear All The Things!!!"); choice = 6; draw(); } } public void mouseExited(MouseEvent evt) { } public void mouseEntered(MouseEvent evt) { } public void mouseClicked(MouseEvent evt) { } public void mousePressed(MouseEvent evt) { xX1 = evt.getX(); yY1 = evt.getY(); } public void mouseReleased(MouseEvent evt) { xX2 = evt.getX(); yY2 = evt.getY(); draw(); eraser = 0; } /** * CHANGE BY S AQEEL : MouseMotionListener functions implemented. Note this listener is only registered when eraser is selected */ public void mouseDragged(MouseEvent me) { Color c = gc.getColor(); gc.setColor(BACKGROUND_COLOR); gc.drawRect(me.getX(), me.getY(), eraserWidth, eraserHeight); gc.fillRect(me.getX(), me.getY(), eraserWidth, eraserHeight); gc.setColor(c); repaint(); } public void mouseMoved(MouseEvent arg0) { } } </code></pre> <p>Now that your problem is solved, you should try to add little but usable quality features, like: Using different cursors for drawing/erasing different shapes. Allow user to change eraser size. Also in the current implementation, the user have to drag the eraser to erase, you should add a functionality so that user can erase points by just clicking (besides dragging).</p>
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