Need help to explain these codes!!! Urgently!!!

Question

Hi anyone who's here to help...I am doing my Final year project report now...i dunno how to explain these codes in word...can anyone tell me what it means? what are these codes for...? what does each paragraph indicate?
thanks.
sorry, maybe i only insert pieces of the codes and its vague...ok, in this source code...what i dun understand is....i have cut and paste the sections of codes which i dun understand as below..
bcoz this codes are passed down from my seniors who had graduated...and my task is to explain these codes in the form of a report without me having any background on programming...i tried asking some frens...its either they dunno or forgotten...this is my last hope...thanks again...thanks..
* new added code */
     Thread scroller;     //for looping purpose
     int loopcounter,count;
     // thread is to allow the program to be called every and then.
     public void init()
          /*new added code */
          loopcounter=0;[list]
**like whats does "thread scroller" means? Looping purpose? what's looping then?
**also, i've tried on changing the "Loopcounter = 0" to other numbers like 2 and 5...and when i run it on the appletviewer..my image simply runs out of my page...
[list]
*And this part...what does it mean?
/*new added code*/                                      
            public void start() {                    
            if (scroller == null) {               
            scroller = new Thread(this);         
            scroller.start();                          
    } [list]
for this section here, i really dunno what it says.. "public void start"--start what? scroller again? new Thread(this)?
[list]
    public void stop() {    
        if (scroller != null) { 
            scroller.stop();   
            scroller = null; 
    } [list]
I dunno about this section also.. stops wat??
[list]
    public void run() {                                                           
          try {Thread.currentThread().sleep(100);}                
            catch (InterruptedException e){}
        for (count=0; count <= 400; ) {  
          try {Thread.currentThread().sleep(20);} 
            catch (InterruptedException e){}  
          rm.load();       
    } [list]
wat is it runing here? try? catch? for? wat does it mean?????
[list]
    public void destroy(){;}                  
    public void update(Graphics g){paint(g);}
}[list]
now this.. wat is it destroying?? updateing wat???
[list]
this is my whole program like...
import java.awt.*;     /*Contains all of the classes for creating user
               interfaces and for painting graphics and images.*/
import java.applet.*;     /*Provides the classes necessary to create an applet and the
               classes an applet uses to communicate with its applet context.*/
/* Loadable is required for RealMedia so that it know that this code
can load images and sounds and has the startUp() method
/* HotSpotListener is required to let HotSpot call hotSpotEvent(HotSpot) when it
has been clicked
//runnable is for looping purpose ....to animate the text or images.
public class LibraryTest extends Applet implements Loadable, HotSpotListener, Runnable
     // RealMedia will load and save images and sounds.
     // It will also give information on the loading process.     
     RealMedia rm;
     // Four buttons that can be clicked on.
     HotSpot hs1,hs2,hs3,hs4;
     // 1 will show image 0 and 1 will show image 1.
     int x =0;
/* new added code */
     Thread scroller;     //for looping purpose
     int loopcounter,count;
     // thread is to allow the program to be called every and then.
     public void init()
          /*new added code */
          loopcounter=0;
          // We'll place the buttons ourselves.
          setLayout(null);
          setBackground(Color.white);
          // create the RealMedia object
          rm = new RealMedia(this);
          //Start adding all image files you will use
          // image0 called pic_black
          rm.add("pic_black.jpg","image0");
          rm.add("EG3165 Tutorial 1.jpg","image0_1");
          rm.add("Question.jpg","image0_2");
          rm.add("Solution.jpg","image0_3");
          rm.add("Exercise.jpg","image0_4");
          //rm.add("cute.gif","image0_5");
          rm.add("mac-win.gif","image0_6");
          rm.add("walking-floppy.gif","image0_7");
          rm.add("eg3165_t001ver03_00.gif","image1");
          rm.add("eg3165_t001ver03_01.gif","image2");
          rm.add("eg3165_t001ver03_02.gif","image3");
          rm.add("eg3165_t001ver03_03.gif","image4");
          rm.add("eg3165_t001ver03_04.gif","image5");
          rm.add("eg3165_t001ver03_05.gif","image6");
          rm.add("eg3165_t001ver03_06.gif","image7");
          rm.add("eg3165_t001ver03_07.gif","image8");
          rm.add("eg3165_t001ver03_08.gif","image9");
          // Start button with 4 images
          // 1 Default state, mouseOver and mouseClick state.
          rm.add("1st.gif");
          rm.add("1st.gif");
          rm.add("1st.gif");
          // 2 Other button
          rm.add("prev.gif");
          rm.add("prev.gif");
          rm.add("prev.gif");
          // 3
          rm.add("next.gif");
          rm.add("next.gif");
          rm.add("next.gif");
          // 4
          rm.add("last.gif");
          rm.add("last.gif");
          rm.add("last.gif");
          // load the images now
          rm.load();
     public void startUp()
          // button 1
          hs1 = new HotSpot(this);
          hs1.setImage(rm.get("1st.gif"),1);
          hs1.setImage(rm.get("1st.gif"),2);
          hs1.setImage(rm.get("1st.gif"),3);
          hs1.setBounds(200,515,40,38);
          // same for button 2
          hs2 = new HotSpot(this);
          hs2.setImage(rm.get("prev.gif"),1);
          hs2.setImage(rm.get("prev.gif"),2);
          hs2.setImage(rm.get("prev.gif"),3);
          hs2.setBounds(250,515,40,38);
          // same for button 3
          hs3 = new HotSpot(this);
          hs3.setImage(rm.get("next.gif"),1);
          hs3.setImage(rm.get("next.gif"),2);
          hs3.setImage(rm.get("next.gif"),3);
          hs3.setBounds(300,515,40,38);
          // same for button 4
          hs4 = new HotSpot(this);
          hs4.setImage(rm.get("last.gif"),1);
          hs4.setImage(rm.get("last.gif"),2);
          hs4.setImage(rm.get("last.gif"),3);
          hs4.setBounds(350,515,40,38);
          // Place them
          add(hs1);
          add(hs2);
          add(hs3);
          add(hs4);
          // Repaint makes sure they are immediately visible.
          hs1.repaint();
          hs2.repaint();
          hs3.repaint();
          hs4.repaint();
     // Here the images are drawn.
     public void paint(Graphics g)
          g.setColor(Color.white);
          // When it is still loading show a loading message.
          if (!rm.isLoaded())
               g.drawString("loading file "+rm.getCurrent(),20,20);
               g.drawString("of "+rm.getTotalFiles(),20,40);
               g.drawString("Percent: "+rm.getPercent(),20,60);
               g.fillRect(20,80,rm.getPercent(),20);
          // Otherwise draw image1 or 2
          else
               if (x == 0)
                    //place images using x-coordinates, y-coordinates.
                    g.drawImage(rm.get("image0"),20,20,this);
                    g.drawImage(rm.get("image0_1"),80+loopcounter,100+loopcounter,this);
                    g.drawImage(rm.get("image0_2"),190+loopcounter,175+loopcounter,this);
                    g.drawImage(rm.get("image0_3"),240+loopcounter,220+loopcounter,this);
                    g.drawImage(rm.get("image0_4"),290+loopcounter,265+loopcounter,this);
                    //g.drawImage(rm.get("image0_5"),150+loopcounter,285+loopcounter,this);
                    g.drawImage(rm.get("image0_6"),400,370,200,100,this);
                    g.drawImage(rm.get("image0_7"),100,300,this);
                    loopcounter+=2;
                    if (loopcounter == 50)
                    loopcounter = 0;
     // if loopcounter+=2, coordinate=x+loopcounter, y+loopcounter.
     /* e.g. round 1, loopcounter=0, coordinate=1,3 */
     /* e.g. round 2, loopcounter=2, coordinate=3,5 */
     /* e.g. round 3, loopcounter=4, coordinate=7,9 */
               else if (x == 1)
                    g.drawImage(rm.get("image1"),20,20,this);
               else if (x == 2)
                    g.drawImage(rm.get("image2"),20,20,this);
               else if (x == 3)
                    g.drawImage(rm.get("image3"),20,20,this);
               else if (x == 4)
                    g.drawImage(rm.get("image4"),20,20,this);
               else if (x == 5)
                    g.drawImage(rm.get("image5"),20,20,this);
               else if (x == 6)
                    g.drawImage(rm.get("image6"),20,20,this);
               else if (x == 7)
                    g.drawImage(rm.get("image7"),20,20,this);
               else if (x == 8)
                    g.drawImage(rm.get("image8"),20,20,this);
               else if (x == 9)
                    g.drawImage(rm.get("image9"),20,20,this);
     // This method is called when a button has been clicked.
     public void hotSpotEvent(HotSpot hs)
          // if it was button 1 show image1.
          if (hs == hs1)
               x = 1;
          // else show image2
          else if (hs == hs2)
               {x = x - 1;
               if ( x <= 1 ) x = 1;
          else if (hs == hs3)
               {x = x + 1;
               if ( x >= 9 ) x = 9;
          else
               x = 9;
          // and repaint to show them.
          repaint();
     // Necessary for RealMedia to load your images
     public Image loadImage(String file)
          return getImage(getCodeBase(),file);
     // Also required but not used this time.
     public AudioClip loadAudio(String file)
          return getAudioClip(getDocumentBase(),file);
/*new added code*/
     public void start() {
            if (scroller == null) {
            scroller = new Thread(this);
            scroller.start();
    public void stop() {
        if (scroller != null) {
            scroller.stop();
            scroller = null;
    public void run() {
          try {Thread.currentThread().sleep(100);}
            catch (InterruptedException e){}
        for (count=0; count <= 400; ) {
          try {Thread.currentThread().sleep(20);}
            catch (InterruptedException e){}
          rm.load();
    public void destroy(){;}
    public void update(Graphics g){paint(g);}
}

Answer 1

Thread scroller;//for looping purpose
**like whats does "thread scroller" means? Looping purpose? what's looping then?So, you don't know what a variable declaration is, and you don't know what looping is, and you're unable to find out other than by having somebody here tell you (your school has no library, no bookstore, and no access to google--only to the Java forums).
Either your school is absolutely backwards and useless, or you're a stupid lazy git who deserves to fail the course. Either way, somebody here posting an answer for you is not going to help you.
The following might.
Sun's basic Java tutorial
Sun's New To Java Center. Includes an overview of what Java is, instructions for setting up Java, an intro to programming (that includes links to the above tutorial or to parts of it), quizzes, a list of resources, and info on certification and courses.
http://javaalmanac.com. A couple dozen code examples that supplement The Java Developers Almanac.
jGuru. A general Java resource site. Includes FAQs, forums, courses, more.
JavaRanch. To quote the tagline on their homepage: "a friendly place for Java greenhorns." FAQs, forums (moderated, I believe), sample code, all kinds of goodies for newbies. From what I've heard, they live up to the "friendly" claim.
Bruce Eckel's Thinking in Java (Available online.)
Joshua Bloch's Effective Java
Bert Bates and Kathy Sierra's Head First Java. This one has been getting a lot of very positive comments lately.