asked on

Java search string

Hi!
I have a text file with username and password.
They are in the format username:password

When the user enters a new username to create, i would like to do a search in this text file to see if such a username has been taken up.
If it has taken up, to return a boolean true;
Please advice.

Cheers!
Darence

This is currently what have.
Please advice.

Boolean check = false;
FileInputStream fstream = new FileInputStream("test.txt");
DataInputStream checkUserName = new DataInputStream(fstream);

while (checkUserName.available() !=0){
System.out.println (checkUserName.readLine());

CEHJ

http://javaalmanac.com/egs/java.io/ReadLinesFromFile.html

Why would it matter if just the username were taken? You need to check the name/password *pairs*

darenceang

ASKER

If the username is taken, then the username will not be created.
The system is like a user/password creation.

So if i enter an option to create user : darenceang

The system will check this txt file to see if darenceang has been registered before.
Else the system will prompt him for a password and then save it into the file as username:password.

I m stuck at the checking of username ( string ) from the inputstream.

Cheers!

ASKER CERTIFIED SOLUTION

CEHJ

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CEHJ

:-)