Using two versions of the one class together?? (I think)

Question

Hi, see the following small program, where the user can enter an int, and the program draws that amount of lines, joined together at a centre point. The user can then move these lines around the centre by dragging the red dot at the end of the lines.
Anyway, what I want to be able to do, is have two different versions of this program running side by side, independently of each other. (ie one might have 4 lines, the other have 3). Each one, would also be able to read data from each other.
Is this possible?
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class Lines4 extends JFrame implements MouseListener, MouseMotionListener {
private int startx = 200;
private int starty = 200;
private JLabel statusBar;
private Road roads[];
private static final int roadLength = 100;
private static final int circleRadius = 4;
private Road movingRoad;
public Lines4() {
super("Lines4");
String ret = JOptionPane.showInputDialog("How many roads are there?");
int numPoints = Integer.parseInt( ret );
double factor = 2.0 * Math.PI / ( numPoints ) ;
roads = new Road[numPoints];
for (int i=0; i<numPoints; i++){
int x = (int)( roadLength * Math.cos( factor * i ) );
int y = (int)( roadLength * Math.sin( factor * i ) );
roads[i] = new Road( i, startx, starty, circleRadius, startx+x, starty+y );
addMouseListener(this);
addMouseMotionListener(this);
statusBar = new JLabel();
getContentPane().add(statusBar, BorderLayout.SOUTH);
public void paint( Graphics g ) {
g.clearRect( 0, 0, getWidth(), getHeight() );
for (int i=0; i<roads.length; i++) {
roads.draw( g );
// MouseListener Event Handlers
public void mouseClicked( MouseEvent e ){
statusBar.setText( "Clicked at [" + e.getX() +
", " + e.getY() + "]" );
public void mousePressed( MouseEvent e ){
statusBar.setText( "Pressed at [" + e.getX() +
", " + e.getY() + "]" );
for (int i=0; i<roads.length; i++) {
if ( roads[i].onCircle( e.getX(), e.getY() ) ) {
movingRoad = roads[i];
public void mouseReleased( MouseEvent e ){
statusBar.setText( "Released at [" + e.getX() + ", " + e.getY() + "]" );
movingRoad = null;
public void mouseEntered( MouseEvent e ){
statusBar.setText( "Mouse in window" );
public void mouseExited( MouseEvent e ){
statusBar.setText( "Mouse outside window" );
// MouseMotionListener event handlers
public void mouseDragged( MouseEvent e ){
statusBar.setText( "Dragged at [" + e.getX() +
", " + e.getY() + "]" );
if ( movingRoad != null ) {
movingRoad.x = e.getX();
movingRoad.y = e.getY();
repaint();
public void mouseMoved( MouseEvent e ) {
statusBar.setText( "Moved at [" + e.getX() +
", " + e.getY() + "]" );
public static void main( String args[] ) {
Lines4 app = new Lines4();
app.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
app.setSize( 400, 400 );
app.setVisible( true );

Answer 1

You need to be very careful which project you open in which version.
For 2014 make sure its on 2014.1 build 81.