My Java Robot Obstacle drawing

[Naphoria]

This is the code for the obstacle drawing class for the java robot (it has distance and touch sensors for finding obstacles in an arena):

import london.*;

public class DrawObstacles {

public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}

private static void createAndShowGUI() {
System.out.println("Created GUI on EDT? "+
SwingUtilities.isEventDispatchThread());
JFrame f = new JFrame("Swing Paint Demo");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.add(new MyPanel());
f.pack();
f.setVisible(true);
}
}

class MyPanel extends JPanel {

private int squareX = 50;
private int squareY = 50;
private int squareW = 20;
private int squareH = 20;

public MyPanel() {

setBorder(BorderFactory.createLineBorder(Color.bla ck));

addSensorListener(new SensorAdapter() {
public void sensorTriggered(SensorEvent e) {
moveSquare(e.getX(),e.getY());
}
});

addRobotMotionListener(new RobotAdapter() {
public void RobotMoved(RobotEvent e) {
moveSquare(e.getX(),e.getY());
}
});

}

private void moveSquare(int x, int y) {
int OFFSET = 1;
if ((squareX!=x) || (squareY!=y)) {
repaint(squareX,squareY,squareW+OFFSET,squareH+OFF SET);
squareX=x;
squareY=y;
repaint(squareX,squareY,squareW+OFFSET,squareH+OFF SET);
}
}


public Dimension getPreferredSize() {
return new Dimension(250,200);
}

protected void paintComponent(Graphics g) {
super.paintComponent(g);
g.drawString("This is my custom Panel!",10,20);
g.setColor(Color.RED);
g.fillRect(squareX,squareY,squareW,squareH);
g.setColor(Color.BLACK);
g.drawRect(squareX,squareY,squareW,squareH);
}
}

The "london" package contains a class called EasyGraphics which draws on the javax.swing.JFrame

There is a lot of problems with this code, so if anyone could help me, that would be great, thank you!

[KevinWorkman]

What are the problems with the code? I suggest you narrow each one down to an SSCCE that demonstrates just that problem, and post it here with a specific question including the exact error message or strange behavior. Don't forget the code tags.

[Naphoria]

I dont really have time, but these are the errors:



DrawObstacles.java:24: cannot find symbol
symbol: class JPanel
class MyPanel extends JPanel {
^
DrawObstacles.java:60: cannot find symbol
symbol : class Dimension
location: class MyPanel
public Dimension getPreferredSize() {
^
DrawObstacles.java:64: cannot find symbol
symbol : class Graphics
location: class MyPanel
protected void paintComponent(Graphics g) {
^
DrawObstacles.java:6: cannot find symbol
symbol : variable SwingUtilities
location: class DrawObstacles
SwingUtilities.invokeLater(new Runnable() {
^
DrawObstacles.java:15: cannot find symbol
symbol : variable SwingUtilities
location: class DrawObstacles
SwingUtilities.isEventDispatchThread());
^
DrawObstacles.java:16: cannot find symbol
symbol : class JFrame
location: class DrawObstacles
JFrame f = new JFrame("Swing Paint Demo");
^
DrawObstacles.java:16: cannot find symbol
symbol : class JFrame
location: class DrawObstacles
JFrame f = new JFrame("Swing Paint Demo");
^
DrawObstacles.java:17: cannot find symbol
symbol : variable JFrame
location: class DrawObstacles
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
^
DrawObstacles.java:33: cannot find symbol
symbol : variable Color
location: class MyPanel
setBorder(BorderFactory.createLineBorder(Color.bla ck));
^
DrawObstacles.java:33: cannot find symbol
symbol : variable BorderFactory
location: class MyPanel
setBorder(BorderFactory.createLineBorder(Color.bla ck));
^
DrawObstacles.java:35: cannot find symbol
symbol : class SensorAdapter
location: class MyPanel
addSensorListener(new SensorAdapter() {
^
DrawObstacles.java:41: cannot find symbol
symbol : class RobotAdapter
location: class MyPanel
addRobotMotionListener(new RobotAdapter() {
^
DrawObstacles.java:52: cannot find symbol
symbol : method repaint(int,int,int,int)
location: class MyPanel
repaint(squareX,squareY,squareW+OFFSET,squareH+OFF SET);
^
DrawObstacles.java:55: cannot find symbol
symbol : method repaint(int,int,int,int)
location: class MyPanel
repaint(squareX,squareY,squareW+OFFSET,squareH+OFF SET);
^
DrawObstacles.java:61: cannot find symbol
symbol : class Dimension
location: class MyPanel
return new Dimension(250,200);
^
DrawObstacles.java:65: cannot find symbol
symbol : variable super
location: class MyPanel
super.paintComponent(g);
^
DrawObstacles.java:67: cannot find symbol
symbol : variable Color
location: class MyPanel
g.setColor(Color.RED);
^
DrawObstacles.java:69: cannot find symbol
symbol : variable Color
location: class MyPanel
g.setColor(Color.BLACK);
^
18 errors

[KevinWorkman]

If *you* don't have time to fix *your* errors, why do you presume that *we* do? We're doing this voluntarily, for free, in our spare time. If you can't put any time into asking a question, why expect others to put time into answering it?

Are you sure you're importing everything you need?

[Naphoria]

Sorry I appreciate this I really do, (i would actually pay you if it could be done quicker though!) Is that what "cannot find symbol" means, because I notice that that is the only error?!

[KevinWorkman]

Sorry I appreciate this I really do, (i would actually pay you if it could be done quicker though!) Is that what "cannot find symbol" means, because I notice that that is the only error?!

It could mean a couple things. It means that the compiler is trying to figure out what a word that you're using means, but it can't find a declaration of it anywhere. For things like variables, it usually means you haven't declared that variable in that scope. For things like classes, it usually means that you haven't imported it correctly. For things like methods, it usually is a symptom of not being able to find the class- it doesn't know what the class is, so it doesn't know which methods the class contains, so it can't find that method. Check your imports.