[hardwired]

Code:

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.RenderingHints;
import java.awt.geom.Line2D;
import java.awt.image.BufferedImage;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
import java.util.ArrayList;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JSlider;
import javax.swing.SwingUtilities;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import javax.swing.event.MouseInputAdapter;

public class FHP extends JPanel {
//    int FreeHandCount = 0;
//    BufferedImage image;
    FreeHandDraw freehand = new FreeHandDraw();
    Color color;
    public ArrayList<FreeHandDraw> arrFreeHand = new ArrayList<FreeHandDraw>();
//    ArrayList xmlFreeHand = new ArrayList();

    public FHP() {
        addMouseListener(new MouseAdapter() {
            public void mousePressed(MouseEvent e) {
                freehand.setNewFreeHand(true);
                freehand.setFreehandX(e.getX());
                freehand.setFreehandY(e.getY());
	        arrFreeHand.add(freehand);
            }

            public void mouseReleased(MouseEvent e) {
                repaint();
//                FreeHandCount++;
            }
        });

        addMouseMotionListener(new MouseMotionAdapter() {
            public void mouseDragged(MouseEvent e) {
                // Index of last element in list:
                int lastIndex = arrFreeHand.size()-1;
                FreeHandDraw free = arrFreeHand.get(lastIndex);
	        free.setFreehandX(e.getX());
                free.setFreehandY(e.getY());
                repaint();
            }
        });  // closing curley brace was missing
    }

    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D) g;
	g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                            RenderingHints.VALUE_ANTIALIAS_ON);
	g2.setPaint(color);
        freehand.drawme(g);
    }


    public static void main(String[] args){
        SwingUtilities.invokeLater(new Runnable(){
    	    public void run(){
    	        FHP free = new FHP();
    		JFrame f = new JFrame();
    		f.getContentPane().add(free);
    		f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    		f.setSize(700, 700);
    		f.setLocationRelativeTo(null); // center
    		f.setVisible(true);
    	    }
    	});
    }
    
    public class FreeHandDraw {
        int[] freehandX = new int[10000];
        int[] freehandY = new int[10000];
        boolean newFreeHand = false;
        int index = 0;
        Color color;

        public void drawme(Graphics g) {
            g.setColor(getColor());
            for (int i = 0; i < index - 1; i++) {
                int x = freehandX[i];
                int y = freehandY[i];
                int x2 = freehandX[i + 1];
                int y2 = freehandY[i + 1];
                g.drawLine(x, y, x2, y2);
            }
        }

        public void setColor(Color str) { color = str; }

        public Color getColor() { return color; }

        public int getIndex() { return index; }

        public void setFreehandX(int is) {
            freehandX[index] = is;
        }

        public void setFreehandY(int is) {
            freehandY[index++] = is;
        }

        public void setIndex(int i) { index = i; }

        public boolean isNewFreeHand() { return newFreeHand; }

        public void setNewFreeHand(boolean newFreeHand) {
            this.newFreeHand = newFreeHand;
        }
    }
}