เขียนเว็บไซต์ ภาษาจาวา เป็นยังไง ผมสงสัยมานานว่า ที่เค้าพูดกัน ว่า เขียนเว็บไซต์กับภาษาจาวา มันเป็นอย่างไร

class Rectangle
{	private double width=1 ;
	private double height=1;
	private static String color="white";
	public Rectangle(){	}	
	public Rectangle(double w,double h,String c)
		{	width=w;
			height=h;
			color=c;}
	public void setWidth(double width)
		{	this.width=width; }
	public void setHeight(double height)
		{	this.height=height;}
	public void setColor(String color)
		{	this.color=color;}
	public double getWidth()
		{	return width;}
	public double getHeight()
		{	return height;}
	public String getColor()
		{	return color;}
	public double findArea()
		{	return width*height;	}
}
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class  TestRectangle
{
	public static void main(String[] args) 
	{	Rectangle rect1 = new Rectangle();
		Rectangle rect2 = new Rectangle(10,5.8,"red"); 
		 rect1.setWidth(12);
		 rect1.setHeight(5.5);
		 rect1.setColor("yellow");
		 System.out.println("ract1  Width ="+rect1.getWidth()+
					"  Height ="+rect1.getHeight()+
					"  Color="+rect1.getColor());
		System.out.println("ract2  Width ="+rect2.getWidth();
					"  Height ="+rect2.getHeight()+
					"  Color="+rect2.getColor());
		System.out.println("Area of rect1 ="+ rect1.findArea());
		System.out.println("Area of rect2 ="+ rect2.findArea());
	}
}
.................
class Account
{	protected double balance;
	public Account(double amount){
	this.balance=amount;}
	public void deposit(double amount){
	this.balance+=amount;}
	public boolean withdraw(double amount)
	{if (amount<=balance)
	{balance-=amount;
	return true;
	}
	else
		return false;}
public void showBalance()
	{System.out.println("Balance is"+balance);}
public double getBalance()
	{return balance;}
}
..................
class  Teller
{
	public static void main(String[] args) 
	{
		Account acc=new Account(5000);
		acc.deposit(2000);
		acc.showBalance();//balance 7000
		acc.withdraw(4000);
		acc.showBalance();//balance 3000
		acc.withdraw(8000);
		acc.showBalance();//balance 3000
		acc.withdraw(2000);
		acc.showBalance();////balance 1000
		acc=new CheckingAccount(10000,5000);//Check
		acc.withdraw(12000);
		acc.showBalance();//balance -2000
	}
}
................
class CheckingAccount extends Account
{	private double credit;
	public CheckingAccount (double amount,double credit)
	{	super(amount);
		this.credit=credit;}
	public boolean withdraw(double amount)
	{	if (amount<=(balance+credit))
	{	balance=balance-amount;
		return true;
		}
		else
		return false;
}
}