Java applet to display sildeshow to images from a given folder

Java applet to display sildeshow to images from a given folder in thumbnail form, images can be selected one by one and can be enable/disable slideshow of images. The thumbnail images are placed in slides folder, the download button(rectangle) downloads the images from the web server, hence a webserver is required eg : any webserver even tomcat webserver with download folder with images*/

Requirements
1. Name of java file : Sildeshow.java
2. Name of images folder : slides
3. Names of images 1.jpg, 2.jpg and so on upto 8.jpg.
3. Name of download folder in webserver : download
4. Download images given below and paste them in slides folder :
1.jpg │2.jpg │3.jpg │4.jpg │5.jpg │6.jpg │7.jpg │8.jpg
5. Download images given below and paste them in download folder in webserver :
1.jpg │ 2.jpg │ 3.jpg │4.jpg │5.jpg │6.jpg │7.jpg │8.jpg

import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import java.net.*;
public class Slideshow extends Applet implements Runnable {
 // Variable Declaration
 Thread runner;
 boolean left,right,click,auto;
 boolean but0,but1;
 boolean b0,b1;
 boolean waitMessage = true;
 String str_desc[] = { // Display Messages
  " This is an Abstract piece.Painted on:20/11/86.",
  " This picture is an Abstract work.Painted on:10/1/89.",
  " This picture is a Canvas oil painting (15/8/92).",
  " This is a Pastel painting (2/10/99).",
  " This picture is an Abstract piece.Painted on:6/5/03.",
  " This is a Brush painting (2/6/05).",
  " This a painted collage (30/1/83).",
  " This is my Graphical art piece.Painted on:20/12/08."};
 int number=1;
 static final int MAX=8;
 Image Picture[]=new Image[MAX]; // Image variable
 Image Buffer;
 Graphics gBuffer; // Graphics Variable
 Font a = new Font("Helvetica", Font.PLAIN,12);
 Font b = new Font("Dialog", Font.PLAIN,10);
 Font c = new Font("Helvetica", Font.BOLD,13);
 Rectangle r0=new Rectangle(400,70,50,20); // ON / OFF
 Rectangle r1=new Rectangle(400,195,120,20); // Click Here
 
 void loadGraphics() { //
  Track the status of a number of media objects
  MediaTracker t=new MediaTracker(this);
  for(int i=0;i< MAX;i++) {
    // Load an image in an applet
   Picture[i]=getImage(getCodeBase(),"slides/"+(i+1)+".jpg");
   t.addImage(Picture[i],0);
   try{
    t.waitForAll(0);
   } catch(InterruptedException e) {
   
   }
   waitMessage=false;
  }
 }

 public void init() {
  // Creates an image
  Buffer=createImage(size().width,size().height);
  gBuffer=Buffer.getGraphics();
  // Creates a graphics context for this component
 }

 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) {
   try {
    runner.sleep(2500);
   } catch (Exception e) { }
   if(auto) {
    if(number< MAX)
    number++;
    else
    number=1;
   }
   repaint();
  }
  }
  
 public void update(Graphics g){ paint(g); }
 
 public void drawArrow(int w,int h,int x,int y,boolean left,boolean over,boolean click) {
  if(click&&over) // set color to yellow on click or mouse over
   gBuffer.setColor(Color.yellow);
  else if(over) // set color to orange on mouse over
   gBuffer.setColor(Color.orange);
  else
  // set color to red on click
   gBuffer.setColor(Color.red);
  if(left) {
   int al[] = {x,x+w,x+w};
   int bl[] = {y+h/2,y,y+h};
   gBuffer.fillPolygon(al, bl, 3);
  } else {
   int ar[] = {x,x,x+w};
   int br[] = {y,y+h,y+h/2};
   gBuffer.fillPolygon(ar, br, 3);
  }
 }

 public void drawPanel() {
  gBuffer.setColor(Color.white);
  gBuffer.fillRect(0,0,size().width,size().height);
  // Display Text
  drawArrow(40,40,330+70,120,true,left,click);
  // Display Left Arrow
  drawArrow(40,40,380+70,120,false,right,click);
  // Display Right Arrow
  gBuffer.setColor(Color.lightGray);
  gBuffer.setFont(b);
  gBuffer.setColor(auto?Color.orange:Color.lightGray);
  gBuffer.fill3DRect(400,70,50,20,!but0);
  // Rectangle for ON rectangle
  gBuffer.setColor(b0?Color.red:Color.black);
  // Color For ON rectangle
  String s=auto?"OFF":"ON";
  gBuffer.drawString(s,410,85);
  gBuffer.setColor(Color.lightGray);
  // Download
  s="Click Here";
  gBuffer.fill3DRect(400,190,120,20,!but1);
  gBuffer.setFont(a);
  gBuffer.setColor(b1?Color.red:Color.black);
  gBuffer.drawString(s,430,205);
  // Display Image
  gBuffer.drawImage(Picture[number-1],20,20,this);
  gBuffer.setColor(Color.black);
  gBuffer.setFont(c);
  gBuffer.drawString("Slideshow:",300,80);
  gBuffer.drawString("Scroll:",300,140);
  gBuffer.drawString("Download it!",300,200);
  gBuffer.drawString("Description:",300,35);
  gBuffer.setFont(a);
  gBuffer.drawString(str_desc[number-1],300,50);
 }

 public boolean mouseDown(Event evt,int x,int y) {
  if(r0.inside(x,y)) {
   but0=true; auto^=true;
  }
  if(r1.inside(x,y))
  {
  but1=true;
  auto=false;
  }
  if(but1)
  {
  String link ="http://localhost:8080/download/"+number+".jpg";
  try {
  // corresponds to an applet's environment
  AppletContext a = getAppletContext();
  URL url = new URL(link);
  // url of the image to be downloaded
  a.showDocument(url,"_blank");
  }
  catch (MalformedURLException e){
  System.out.println(e.getMessage());
  }
  }
  if(left)
  {
  auto=false;
  if(number>1)
  number--;
  else number=8;
  }
  if(right)
  {
  auto=false;

  if(number< MAX)
  number++;
  else
  number=1;
  }
  click=true;
  repaint();
  return true;
  }
 
 public boolean mouseUp(Event evt,int x,int y) {
  but0=but1=click=false;
  repaint();
  return true;
 }

 public boolean mouseMove(Event evt,int x,int y)  {
  Rectangle rl=new Rectangle(330+70,120,40,40);
  Rectangle rr=new Rectangle(380+70,120,40,40);
  if(rl.inside(x,y))
   left=true;
  else
   left=false;
  
  if(rr.inside(x,y))
   right=true;
  else
   right=false;
  
  if(r0.inside(x,y))
   b0=true;
  else
   b0=false;
  
  if(r1.inside(x,y))
   b1=true;
  else
   b1=false;
  repaint();
  return true;
 }
 
 public void paint(Graphics g) {
  if(waitMessage) { 
   g.setColor(Color.blue);
   g.drawString("Loading images, please wait...",200,100);
   loadGraphics();
  } else {
   drawPanel();
   g.drawImage (Buffer,0,0, this);
  }
 }
}

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JDK Version 7.0 VS JDK Version 6.0

This post contains my notes for comparison between java 7 and java 6.

1. Java 7 is faster than Java 6 performance wise. Ideally any previous code should run faster on Java 7 with same benchmarks. (Read on couple of blogs, need to do my check.)

2. New and Better Concurrent Garbage Collector in Java 7, called G1. Should be able to handle very large Heaps. Again, need to do my check.

3. Modularization of JDK. Which makes sense, since it will reduce the download size, get only what you actually want, reduced start up time and of course lesser memory footprint.

4. Project Jigsaw - which will happen completely in Open source. Related to #3 modularization, Allow other people to develop modules independently and Sun may (or may not) add these components to future releases of Java.

5. AutoClosable and try with resource - Allows auto closing of resource without the need of writing extra code. This is a new interface that comes with Java 7.

6. New constructor has been added to Throwable class which can be used to enable or disable the suppression of exceptions. If disabled none of the suppressed exceptions are tracked.

7. Strings are allowed in switch block. In older versions of java it gives compilation error. Here's an example program:

public class TestString{ 
 public static void main(String args[]){
   String test = "red";
   switch(test){
     case "red": System.out.println("I am red");
     break;
     case "blue": System.out.println("blue is blue");
     break;
     default: System.out.println("colorless!");
    }
  }
}

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