Programing proplems

C:\Documents and Settings\Kenneth Rinderhagen>cd C:\bin
C:\bin>javac
Exception in thread "main" java.lang.NoClassDefFoundError: com/sun/tools/javac/M
ain
Caused by: java.lang.ClassNotFoundException: com.sun.tools.javac.Main
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
C:\bin>cd C:\java
C:\java>javac HelloWorldApp.java
HelloWorldApp.java:1: unclosed comment
^
1 error
C:\java>dir
Volume in drive C is KRRJR
Volume Serial Number is 48BF-59E1
Directory of C:\java
02/16/2008 01:32 PM <DIR> .
02/16/2008 01:32 PM <DIR> ..
02/16/2008 01:32 PM <DIR> applet
02/16/2008 01:32 PM <DIR> awt
02/16/2008 01:32 PM <DIR> beans
02/16/2008 01:11 PM 293 HelloWorldApp.java
02/16/2008 01:32 PM <DIR> io
02/16/2008 01:32 PM <DIR> lang
02/16/2008 01:32 PM <DIR> math
02/16/2008 01:32 PM <DIR> net
02/16/2008 01:32 PM <DIR> nio
02/16/2008 01:32 PM <DIR> rmi
02/16/2008 01:32 PM <DIR> security
02/16/2008 01:32 PM <DIR> sql
02/16/2008 01:32 PM <DIR> text
02/16/2008 01:33 PM <DIR> util
1 File(s) 293 bytes
15 Dir(s) 23,031,562,240 bytes free
C:\java>javac HellooWorldApp.java
javac: file not found: HellooWorldApp.java
Usage: javac <options> <source files>
use -help for a list of possible options
C:\java>javac HelloWorldApp.java
HelloWorldApp.java:1: unclosed comment
^
1 error
C:\java>

The error message tells you exactly what's wrong.
You have opened a comment with /* but have not closed it with */

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              int h=size().height-5;          
              //our balls have different start coordinates, increment values
              //(speed, direction) and colors
              ball[0]=new CollideBall(w,h,50,20,1.5,2.0,Color.orange);
    ball[1]=new CollideBall(w,h,60,210,2.0,-3.0,Color.red);
    ball[2]=new CollideBall(w,h,15,70,-2.0,-2.5,Color.pink);
    ball[3]=new CollideBall(w,h,150,30,-2.7,-2.0,Color.cyan);
    ball[4]=new CollideBall(w,h,210,30,2.2,-3.5,Color.magenta);
              ball[5]=new CollideBall(w,h,360,170,2.2,-1.5,Color.yellow);
              ball[6]=new CollideBall(w,h,210,180,-1.2,-2.5,Color.blue);
              ball[7]=new CollideBall(w,h,330,30,-2.2,-1.8,Color.green);
              ball[8]=new CollideBall(w,h,180,220,-2.2,-1.8,Color.black);
              ball[9]=new CollideBall(w,h,330,130,-2.2,-1.8,Color.gray);
              o=new Obstacle(150,80,130,90);
              west=o.r.x;
              north=o.r.y;
              east=o.r.x+o.r.width;
              south=o.r.y+o.r.height;
         public void start()
              if (runner == null)
                   runner = new Thread (this);
                   runner.start();
    public void stop()
              if (runner != null)
         runner.stop();
         runner = null;
         public void run()
              while(true)
                   Thread.currentThread().setPriority(Thread.MAX_PRIORITY);
                   try {runner.sleep(15);}
         catch (Exception e) { }               
                   //move our balls around
                   for(int i=0;i<MAX;i++)
                        ball.move();
                   handleCollision();
                   repaint();     
         boolean collide(CollideBall b1, CollideBall b2)
              double wx=b1.getCenterX()-b2.getCenterX();
              double wy=b1.getCenterY()-b2.getCenterY();
              //we calculate the distance between the centers two
              //colliding balls (theorem of Pythagoras)
              double distance=Math.sqrt(wx*wx+wy*wy);
              if(distance<b1.diameter)                         
                   return true;          
                   return false;     
         void changeCursor(int x, int y)
              Rectangle r=new Rectangle(o.r.x+1,o.r.y+1,o.r.width-1,o.r.height-1);
              Frame BrowserFrame;
              Component ParentComponent;
              ParentComponent = getParent();
              while ( ParentComponent != null &&
              !(ParentComponent instanceof Frame))           
              ParentComponent = ParentComponent.getParent();          
              BrowserFrame = (Frame) ParentComponent;
              if(shiftNW||shiftSE)
                   BrowserFrame.setCursor(Frame.SE_RESIZE_CURSOR);
              else if(shiftNE||shiftSW)
                   BrowserFrame.setCursor(Frame.SW_RESIZE_CURSOR);
              else if(shiftW)
                   BrowserFrame.setCursor(Frame.W_RESIZE_CURSOR);
              else if(shiftN)
                   BrowserFrame.setCursor(Frame.N_RESIZE_CURSOR);
              else if(shiftE)
                   BrowserFrame.setCursor(Frame.W_RESIZE_CURSOR);
              else if(shiftS)
                   BrowserFrame.setCursor(Frame.N_RESIZE_CURSOR);
              else if(r.inside(x,y))
                   BrowserFrame.setCursor(Frame.MOVE_CURSOR);
              else
                   BrowserFrame.setCursor(Frame.DEFAULT_CURSOR);
         public boolean mouseMove(Event evt,int x,int y)
              //the corner areas of the obstacle
              Rectangle nw,sw,ne,se;
              nw=new Rectangle(o.r.x-2,o.r.y-2,4,4);
              if(nw.inside(x,y))
                   shiftNW=true;
              else shiftNW=false;
              sw=new Rectangle(o.r.x-2,o.r.y+o.r.height-2,4,4);
              if(sw.inside(x,y))
                   shiftSW=true;
              else shiftSW=false;
              ne=new Rectangle(o.r.x+o.r.width-2,o.r.y-2,4,4);
              if(ne.inside(x,y))
                   shiftNE=true;
              else shiftNE=false;
              se=new Rectangle(o.r.x+o.r.width-2,o.r.y+o.r.height-2,4,4);
              if(se.inside(x,y))
                   shiftSE=true;
              else shiftSE=false;          
              if(x>o.r.x-2&&x<o.r.x+2&&y>o.r.y&&y<o.r.y+o.r.height)
                   shiftW=true;
              else shiftW=false;
              if(x>o.r.x+o.r.width-2&&x<o.r.x+o.r.width+2
                   &&y>o.r.y&&y<o.r.y+o.r.height)
                   shiftE=true;
              else shiftE=false;
              if(y<o.r.y+2&&y>o.r.y-2&&x>o.r.x&&x<o.r.x+o.r.width)
                   shiftN=true;
              else shiftN=false;
              if(y>o.r.y+o.r.height-2&&y<o.r.y+o.r.height+2
                   &&x<o.r.x+o.r.width)
                   shiftS=true;
              else shiftS=false;
              changeCursor(x,y);
              return true;
         public boolean mouseDown(Event evt,int x,int y)
              Rectangle r=new Rectangle(o.r.x+2,o.r.y+2,o.r.width-4,o.r.height-4);
              if(r.inside(x,y))
                   drag=true;
                   startx=x;
                   starty=y;
                   xtemp=o.r.x;
                   ytemp=o.r.y;
              else drag=false;
              changeCursor(x,y);
              return true;
         public boolean mouseDrag(Event evt,int x,int y)
              intro=false;
              Rectangle bounds=new Rectangle(5,5,size().width-5,size().height-5);
              int endx, endy;          
              endx=x-startx;
              endy=y-starty;     
              //disable mouse actions past boundaries
              if(x<5)x=5;
              if(y<5)y=5;
              if(x>bounds.width)x=bounds.width;
              if(y>bounds.height)y=bounds.height;
              if(drag)
                   //disallow to move past border
                   int ox=endx+xtemp;
                   int oy=endy+ytemp;
                   if(ox<5)ox=5;
                   if(oy<5)oy=5;
                   if(ox>bounds.width-o.r.width)
                        ox=bounds.width-o.r.width;
                   if(oy>bounds.height-o.r.height)
                        oy=bounds.height-o.r.height;     
                   o.r.move(ox,oy);                    
                   west=o.r.x;
                   north=o.r.y;
                   east=o.r.x+o.r.width;
                   south=o.r.y+o.r.height;                              
              else
                   if(shiftNW){west=x;north=y;}
                   else if(shiftNE){east=x;north=y;}
                   else if(shiftSW){west=x;south=y;}
                   else if(shiftSE){east=x;south=y;}
                   else if(shiftW)west=x;
                   else if(shiftE)east=x;
                   else if(shiftN)north=y;
                   else if(shiftS)south=y;                                                       
                   //disallow resizing below 40*40
                   int MIN=40;
                   if(east-west<MIN)
                        //shiftNW=shiftNE=shiftSW=shiftSE=shiftW=shiftE=false;
                        if(shiftW||shiftNW||shiftSW)
                             west=east-MIN;
                        if(shiftE||shiftNE||shiftSE)
                             east=west+MIN;
                   if(south-north<MIN)
                        //shiftNW=shiftNE=shiftSW=shiftSE=shiftN=shiftS=false;
                        if(shiftN||shiftNW||shiftNE)
                             north=south-MIN;
                        if(shiftS||shiftSE||shiftSW)
                             south=north+MIN;
              //report altering of obstacle to ball objects and obstacle
              for(int i=0;i<MAX;i++)
                   ball[i].alterRect(o.r.x,o.r.y,o.r.width,o.r.height);
              o.r.move(west,north);
              o.r.resize(east-west, south-north);
              changeCursor(x,y);
              return true;
         private void handleCollision()
              //we iterate through all the balls, checking for collision
              for(int i=0;i<MAX;i++)
                   for(int j=0;j<MAX;j++)
                             if(i!=j)
                                  if(collide(ball[i], ball[j]))
                                       ball[i].hit(ball[j]);
                                       ball[j].hit(ball[i]);
         public void update(Graphics g)
              paint(g);
         public void paint(Graphics g)
              gBuffer.setColor(Color.lightGray);
              gBuffer.fillRect(0,0,size().width,size().height);
              gBuffer.draw3DRect(5,5,size().width-10,size().height-10,false);               
              //paint the obstacle rectangle
              o.paint(gBuffer);
              //paint our balls
              for(int i=0;i<MAX;i++)
                        ball[i].paint(gBuffer);     
              if(intro)
                   gBuffer.setColor(Color.red);
                   gBuffer.setFont(new Font("Helvetica", Font.PLAIN, 12));               
                   gBuffer.drawString("You can move and resize the rectangle!",20,30);
                   gBuffer.setFont(new Font("Helvetica", Font.PLAIN, 10));
              g.drawImage (Buffer,0,0, this);                    

    Hello, please use code tags next time you post code. You can do so by adding [code] [/code] round blocks of code. So
    [code]
    class Code {
    private static final String codeHere = "code here";
    [/code]
    will be rendered as
    class Code {
      private static final String codeHere = "code here";
    We will not do your homework for you, we will however help when you are stuck and point you in the right direction. So what have you tried? What happened?
    Don't know how to begin? What makes the ball move?

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    Thanks again
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