Need help on AJAX in java

Hi! I'm very new to the concept of AJAX and I was hoping someone could help me out. Basically, I have an application that needs to implement AJAX to speed up the transaction.
What the program does is it has a dropdown box which has dates. After the user selects a date and clicks the submit button, the server returns a user from the database.
My question is, how do I implement AJAX here? If it is possible, please guide me with this since I barely know how and where to start.
Thanks!

dont crosspost

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Need help in my assignment, Java programing?

Need help in my assignment, Java programing?
It is said that there is only one natural number n such that n-1 is a square and
n + 1 is a cube, that is, n - 1 = x2 and n + 1 = y3 for some natural numbers x and y. Please implement a program in Java.
plz help!!
and this is my code
but I don't no how to finsh it with the right condition!
plz heelp!!
and I don't know if it right or wrong!
PLZ help me!!
import javax.swing.JOptionPane;
public class eiman {
public static void main( String [] args){
String a,b;
double n,x,y,z;
boolean q= true;
boolean w= false;
a=JOptionPane.showInputDialog("Please enter a number for n");
n=Double.parseDouble(a);
System.out.println(n);
x=Math.sqrt(n-1);
y=Math.cbrt(n+1);
}

OK I'll bite.
I assume that this is some kind of assignment.
What is the program supposed to do?
1. Figure out the value of N
2. Given an N determine if it is the correct value
I would expect #1, but then again this seem to be a strange programming assignment to me.
// additions followI see by the simulpostings that it is indeed #1.
So I will give the tried and true advice at the risk of copyright infringement.
get out a paper and pencil and think about how you would figure this out by hand.
The structure of a program will emerge from the mists.
Now that I think about it that advice must be in public domain by now.
Edited by: johndjr on Oct 14, 2008 3:31 PM
added additional info

Need help in creating a java program

Hi everyone.
I'd like to say before i start about my problem, that i've only begun learning java and my teacher hasn't explained anything at all. He only showed us by doing it himself and then showing us the final version. I've searched a little on how to program but i get little success in finding a good tutorial.
I need help creating a program which has been assigned to me due in a few days in which i can't contact my teacher for help.
I need to write a java program which inputs 3 items. The number of kilometres you drove, the number of litres of gas you used and the price you paid for the gas. Then, the program must calculate the number of litres used per 100km driven, which is litres divided by kilometres times 100, how much it costs to drive 100km, which is the result (a) times the price per litre and the number of miles per American gallon of gas ( one American gallon = 3.785 litres, and one mile = 1.609 km.
The program has to output my name, the inputs given, the results computed and a message saying "Program Complete".
To give you what i've done to begin with, from what i understood, is:
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public class prog1
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          final double americanGallon = 3.785;
          final double mile = 1.609;
          kilometresDriven,
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          priceOfLiterGas;
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          gasUsed = JOptionPane.showInputDialog ("Litres of gas used");
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Up to now, that's all i've got. i know i'm wrong, but i'm not sure how to do this. Could someone give me an outline of what this program is suppose to look like?
Thanks in advance.

Here's an update on my program. I've worked on certain details and would need your comments whether it contains errors. I'd also want to know if it would work or not because i don't know how to check it on my computer.
Here's the update:
import javax.swing.JOptionPane;
public class Prog1
public static void main(String args[])
String name;
double kmDriven;
double litresUsed;
double pricePaidForGas;
double priceOfALiter;
name = JOptionPane.showInputDialog("Name");
input = JOptionPane.showInputDialog("Number of km driven");
kmDriven = Double.parseDouble (input);
input = JOptionPane.showInputDialog("Number of litres of gas used");
litresUsed = Double.parseDouble (input);
input = JOptionPane.showInputDialog("Price paid for gas");
pricePaidForGas = Double.parseDouble (input);
input = JOptionPane.showInputDialog("Price of a litre of gas");
priceOfALiter = Double.parseDouble (input);
a = (litresUsed/kmDriven)*100;
b = ((litresUsed/kmDriven)*100)*priceOfALiter);
c = (kmDriven/1.609)
System.out.println("Name:" + name);
System.out.println("Number of litres used per 100km:" + a);
System.out.println("Cost of driving 100km" + b);
System.out.println("Number of miles per American Gallon of Gas:" + c);
System.out.println("Program Complete");
System.exit(0);
Comments please.
Thanks in advance

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Second digit value multiplied by 2 4
Fourth digit value multiplied by 2 8
Sixth digit value multiplied by 2 12
Eighth digit value multiplied by 2 16
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Value derived from 8th digit 7
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The SIN 120406780 is Valid
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/*     File:     sinnumber.java
     Author:     Ashley
     Date:     October 2006
     Purpose: Lab1
import java.util.Scanner;
public class Lab1
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               int number0, number1, number2, number3, number4, number5, number6, number7, number8;
               int count = 0;
               int second, fourth, sixth, eighth;
               System.out.print("\t\n**********************************");
               System.out.print("\t\n**********SIN Validation**********");
               System.out.print("\t\n**********************************");
               System.out.println("\t\nPlease enter the First sin number: ");
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http://today.java.net/pub/a/today/2005/10/27/sprinkle-ajax-magic-into-struts-webapp.html
http://www.theserverside.com/news/thread.tss?thread_id=37355
http://getahead.ltd.uk/dwr/examples/lists
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http://www.jibbering.com/2002/4/httprequest.html
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XI Java Mapping Helper (DOM) /people/alessandro.guarneri/blog/2007/03/25/xi-java-mapping-helper-dom
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         theta=theta*(Math.PI/180);
         x=((x-(x+10))*Math.cos(theta)-y*Math.sin(theta)+(x+10));
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LJ
P.s. I know its a little rough, I wanted to clean it up soon.
Message was edited by:
nipponman21

Ok, I have officially given up on trying to get it to work via the mathematical definitions of a rotational transform. I decided to use the affine transform and it was MUCH easier than I thought to implement; however, the results are still unexpected, the ship actually turns and moves in a circle which is not what I want, here is the source (its a standalone app so you can compile and run it if you want) import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
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         ball=new Ball();
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    t=new Thread(this);
         t.start();
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             while(true){
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                  }catch(Exception e){}
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    public static void main(String[] args) {
        new BouncingBall();
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               else{
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               ship.move(0,dy);
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               case KeyEvent.VK_RIGHT:
                    theta--;
                    break;
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    public void keyReleased(KeyEvent e){
        switch(e.getKeyCode()){
               case KeyEvent.VK_UP:
               case KeyEvent.VK_DOWN:
               dy=0;
               break;
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    public void keyTyped(KeyEvent e){
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          double x;
          double y;
         private Arc2D.Double body;
         public Ball(){
              x=600.0;
              y=500.0;
              body=new Arc2D.Double(x,y,30.0,30.0,0.0,360.0,Arc2D.OPEN);
         public void move(double dx,double dy){
              body=new Arc2D.Double();
              x+=dx;
              y+=dy;
              body=new Arc2D.Double(x,y,30.0,30.0,0.0,360.0,Arc2D.OPEN);
         public double getX(){
         return this.x;
         public double getY(){
         return this.y;
    class Ship{
          double x;
          double y;
          double angle;
         private Polygon body;
         public Ship(){
              x=400.0;
              y=300.0;
              angle=0;
              body=new Polygon();
              body.addPoint((int)Math.round(x),(int)Math.round(y));
              body.addPoint((int)Math.round(x+15),(int)Math.round(y));
              body.addPoint((int)Math.round(x+7.5),(int)Math.round(y-20));
         public void move(double dx,double dy){
              body=new Polygon();
              x+=dx;
              y+=dy;
              body.addPoint((int)Math.round(x),(int)Math.round(y));
              body.addPoint((int)Math.round(x+15),(int)Math.round(y));
              body.addPoint((int)Math.round(x+7.5),(int)Math.round(y-20));
         public double getX(){
         return this.x;
         public double getY(){
         return this.y;
    class DrawPanel extends JPanel{
          public DrawPanel(){
              setBackground(Color.black);
              setPreferredSize(new Dimension(BouncingBall.WIDTH,BouncingBall.HEIGHT));
         public void paintComponent(Graphics g){
             super.paintComponent(g);
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             g2d.rotate(theta*Math.PI / 180.0);
             g2d.fill(ship.body);
}Can you guys maybe run this and look over the code and tell me what I'm doing wrong? I would definitely appreciate it Thanks.

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