Urgent!Please Help!Thanks ALot

Question

For Example:
Name: Kwok Fu Sing
Company: ACE
USERID generated: ACEZKFS
the NAME and COMPANY CODE is already in the database and i need to display the name and the initial of name and company in the form based on the EMPLOYEE ID entered by the user.From there, i must take out the company code and 3 initial of the NAME.Besides, I got to make sure there is no duplicate in the database as it will be treated as the USERID.
the name is not input by the user but is retireve from the database,and the USERID got to be generated by the system.
How do I generate the company code and 3 initial from the name together and most importantly, making sure there is no duplicates for USERID?
If there are duplicates,
the system got to re-generate the userid again using the second letter of the person name.If the system check again, there is another duplicate, the system got to re-generqate again using the third letter and so on.
For Example:
Name: Kwok Fu Sing
Company: ACE
USERID generated: ACEZKUS

Answer 1

consider the following
not for copying
but for studying working code
to help clarify ideas
import java.io.*;
list items and count of each item
in a list of socks
file has list of socks ...
4
red sock
green sock
blue sock
green sock
the first line is n = count of socks
if no socks match, there are n items
for example : 3 items in ...
3
red sock
blue sock
green sock
if all socks match there is one item
for example : 1 item in ...
3
red sock
red sock
red sock
if socks come in pairs, there are at most n/2 items
for example : 2 items in ...
4
red sock
green sock
red sock
green sock
program does not assume that socks come in pairs !!
public class Socks {
public static void main(String args[]) throws IOException
String[] socks = new String[1000];
int numOfsocks;
String[] item = new String[1000];
int[] count = new int[1000]; // initializes each count to zero
int totalcount = 0;
int i;
int j;
boolean ifound;
FileReader fr = new FileReader("test.txt");
BufferedReader inFile = new BufferedReader(fr);
numOfsocks = Integer.parseInt(inFile.readLine());
for (i = 0; i < numOfsocks; i++)
socks[ i ] = inFile.readLine();
inFile.close();
for (i = 0; i < numOfsocks; i++) {
ifound = false;
for (j = 0; j < totalcount; j++) {
if (socks[ i ].equalsIgnoreCase(item[j])) {
ifound = true;
count[j]++; // increase count for matched item
break; // exit "for j loop"
} // for j
// sock not found so add it to item list ...
if (ifound == false) {
item[totalcount] = socks[ i ];
count[totalcount] = 1;
totalcount++;
} // for i
for (i = 0; i < totalcount; i++)
System.out.println (item[ i ] + ", count = " + count[ i ]);
} // class