Any free JAVA coding?

[leeckeat]

Hi,
Where i can download some free JAVA code/application?
i need to find some credit card validation machanism written in JAVA ..can anyone help me?

[Mark Sreeves]

I'm working on it!

this is want you want in VB
(thanks to Aaron Young)
see thread: http://forums.vb-world.net/showthread.php?threadid=3034

I'm trying to convert it to java for you but I'm having trouble getting my head around the if iif()then line

Option Explicit

Private Function CheckCreditCard(ByVal sNumber As String) As Boolean
    Dim iCount As Integer
    Dim iDigit As Integer
    Dim iTotal As Integer
    
    For iCount = 1 To Len(sNumber)
        iDigit = Val(Mid$(sNumber, iCount, 1))
        If IIf(Len(sNumber) Mod 2, iCount Mod 2 = 0, iCount Mod 2) Then
   
            iDigit = iDigit * 2
            If iDigit > 9 Then iDigit = iDigit - 9
        End If
        iTotal = iTotal + iDigit
    Next
    If iTotal Mod 10 = 0 And Len(sNumber) > 0 Then CheckCreditCard = True
    
End Function
Private Sub Command1_Click()
    If CheckCreditCard(Text1) Then
        MsgBox "Credit Card Verified"
    Else
        MsgBox "Credit Card Invalid"
    End If
End Sub

[Mark Sreeves]

Got it!
(NOTE: this is for use on the command line rather than an applet)

For some unknown reason my compliler objected to my using Integer.parseInt to convert from a numerical char to an integer so I used a byte array instead.

import java.io.*;
public class cardchecker{
	
public static void main(String[] args) throws IOException {	
		byte[] sNumber = args[0].getBytes();	 
		int iCount = 0;
		int iDigit = 0;
		int iTotal = 0;
	
     for(iCount = 0; iCount < sNumber.length;iCount++)
	 {	 
		 
		iDigit = sNumber[iCount] - 48;
		//System.out.println(iDigit);
		boolean b = false;		
		
		if ((sNumber.length % 2 )== 1)
		{
			b =(((iCount+1) %2) == 0);//icount runs from 0 NOT 1
		}else{
			b = (((iCount+1) %2) == 1);
		}
		
		//System.out.println("b is : " + b );
		if(b==true)
		{
			iDigit *= 2;
		 
			if(iDigit > 9)
			{
				iDigit -= 9;
			}
		}
         iTotal += iDigit;
	
	};
	// System.out.println("iTotal: " + iTotal%10);
	if((iTotal % 10 == 0) && (sNumber.length > 0)) 
	{
		System.out.println("Credit Card Verified");
	}else{
		System.out.println("Credit Card Invalid");
	}
	
	
	}
	}