Please Check My Code and Give Advice..

Question

Hi all.... I am new in Java Programming and need your help for the following :
Convert binary numbers to decimal.
The program should prompt user to enter the number. Upon clicking the button, the program should display the number, the positional wightage of each digit of the number ( I have done some researched n found that i have to use pow method for this....is this correct??? ) .........and the decimal equivalent of the number.
I know how to convert binary to decimal...octal to decimal ... and vice versa as I have learned that prior taking this java programming class.
And I have no difficulty creating buttons n labels....that's the easiest part.
What I don't know is how to use the pow method for the conversion part as I am not gonna have any fix number....user will type lets say...01001 or 111000 .... so how do i capture the numbers from right to left n convert it to decimal?
I noe the conversion is like :
(0*16) + (1*8) + (0*4) + (0*2) +( 0*1)
and I tried using ifElse statements...but i think there's a much simpler n easier way to do....well...maybe i give u what i've done n can u all can shed some light on where i went wrong...
i m such a dummy in this i need to be knock on the head...
well here goes:
import java.awt.*;
import java.applet.*;
import java.awt.event.*;
public class Numberpro extends Applet implements ActionListener
Label first, one, two;
TextField satu, dua;
Button con;
int answer;//number that is entered in the textfield
double a1,a2,a4,a8,a16;//declare the 5 digit binary to decimal conversion power
//example:2^0=1 , 2^1=2 , 2^2=4 , 2^3=8 , 2^4=16
int a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z,za,zb,zc,zd,ze;
//declare if 00000 , 00001 , 00010 then it becomes.....
String type="binary";//convert binary base to decimal
String type2="octal";//convert octal base to decimal
String type3="";
public void init()
{first=new Label ("Number System");
add(first);
one=new Label ("Enter the number : ");
add(one);
satu=new TextField(9);
add(satu);
satu.addActionListener(this);
two=new Label ("Enter the base system ");
add(two);
dua=new TextField(9);
add(dua);
dua.addActionListener(this);
con=new Button ("Convert");
add(con);
con.addActionListener(this);}
public void actionPerformed(ActionEvent event)
{answer=Integer.parseInt(event.getActionCommand());
repaint();
type3=dua.getText();
repaint();}
public static double pow(int a, int b)
{a1 = Math.pow(2.0, 0.0);
a2 = Math.pow(2.0, 1.0);
a4 = Math.pow(2.0, 2.0);
a8 = Math.pow(2.0, 3.0);
a16 = Math.pow(2.0, 4.0);}
public void paint(Graphics g)
{a=a1;
b=a2;
c=(a2+a1);
d=a4;
e=a4+a1;
f=a4+a2;
g=a4+a2+a1;
h=a8;
i=a8+a1;
j=a8+a2;
k=a8+a2+a1;
l=a8+a4;
m=a8+a4+a1;
n=a8+a4+a2;
o=a8+a4+a2+a1;
p=a16;
q=a16+a1;
r=a16+a2;
s=a16+a2+a1;
t=a16+a4;
u=a16+a4+a1;
v=a16+a4+a2;
w=a16+a4+a2+a1;
x=a16+a8;
y=a16+a8+a1;
z=a16+a8+a2;
za=a16+a8+a2+a1;
zb=a16+a8+a4;
zc=a16+a8+a4+a1;
zd=a16+a8+a4+a2;
ze=a16+a8+a4+a2+a1;}
if (type.equals(type3))
{g.drawString("answer " , 40, 55 );}
if (type=00000)
{g.drawString("Decimal Equivalent " + 0 , 60, 75 );}
else
if (type=00001)
{g.drawString("Decimal Equivalent " + a , 60, 75 );}
else
if (type=00010)
{g.drawString("Decimal Equivalent " + b , 60, 75 );}
else
if (type=00011)
{g.drawString("Decimal Equivalent " + c , 60, 75 );}
else
if (type=00100)
{g.drawString("Decimal Equivalent " + d , 60, 75 );}
else
if (type=00101)
{g.drawString("Decimal Equivalent " + e , 60, 75 );}
else
if (type=00110)
{g.drawString("Decimal Equivalent " + f , 60, 75 );}
else
if (type=00111)
{g.drawString("Decimal Equivalent " + g , 60, 75 );}
else
if (type=01000)
{g.drawString("Decimal Equivalent " + h , 60, 75 );}
else
if (type=01001)
{g.drawString("Decimal Equivalent " + i , 60, 75 );}
else
if (type=01010)
{g.drawString("Decimal Equivalent " + j , 60, 75 );}
else
if (type=01011)
{g.drawString("Decimal Equivalent " + k , 60, 75 );}
else
if (type=01100)
{g.drawString("Decimal Equivalent " + l , 60, 75 );}
else
if (type=01101)
{g.drawString("Decimal Equivalent " + m , 60, 75 );}
else
if (type=01110)
{g.drawString("Decimal Equivalent " + n , 60, 75 );}
else
if (type=01111)
{g.drawString("Decimal Equivalent " + o , 60, 75 );}
else
if (type=10000)
{g.drawString("Decimal Equivalent " + p , 60, 75 );}
else
if (type=10001)
{g.drawString("Decimal Equivalent " + q , 60, 75 );}
else
if (type=10010)
{g.drawString("Decimal Equivalent " + r , 60, 75 );}
else
if (type=10011)
{g.drawString("Decimal Equivalent " + s , 60, 75 );}
else
if (type=10100)
{g.drawString("Decimal Equivalent " + t , 60, 75 );}
else
if (type=10101)
{g.drawString("Decimal Equivalent " + u , 60, 75 );}
else
if (type=10110)
{g.drawString("Decimal Equivalent " + v , 60, 75 );}
else
if (type=10111)
{g.drawString("Decimal Equivalent " + w , 60, 75 );}
else
if (type=11000)
{g.drawString("Decimal Equivalent " + x , 60, 75 );}
else
if (type=11001)
{g.drawString("Decimal Equivalent " + y , 60, 75 );}
else
if (type=11010)
{g.drawString("Decimal Equivalent " + z , 60, 75 );}
else
if (type=11011)
{g.drawString("Decimal Equivalent " + za , 60, 75 );}
else
if (type=11100)
{g.drawString("Decimal Equivalent " + zb , 60, 75 );}
else
if (type=11101)
{g.drawString("Decimal Equivalent " + zc , 60, 75 );}
else
if (type=11110)
{g.drawString("Decimal Equivalent " + zd , 60, 75 );}
else
if (type=11111)
{g.drawString("Decimal Equivalent " + ze , 60, 75 );}
I have another question for you too:
1) For the TextField can i use ActionListener instead of TextListener....will it still work?

Answer 1

Couple of things I'd like to mention:
1. Your code is buggy. You need to repair it a lot.
2. You posted the question on the wrong forum. I can't find anything to do with a JSP.
***Annie***