Display warning if 2 names are identical

Question

Can someone please help me with this. My array program is below. I need to edit it to make a message display 'This password has been chosen' if to names are identical. I have played around with it and I can get the warning to appear but all the time. The code below makes the warning cycle continuously down the page. If anyone could help I would be very gratefull.
import java.io.*;
public class Arraylist
public static void main(String[] args)
String members[] = {"Fred","Brenda","John"};
System.out.println("full member: "+members[0]);
while (members==members)
System.out.println("this password has been chosen");

Answer 1

I'm going to assume for a moment that this is a serious question and not a troll.
It should be obvious that (members==members) is going to return true always.
At what point are you checking to see if there is a duplicate? Is it only in the original array, or are you adding items later?
In either case, some classes that should help you are:
HashSet (or anything implementing the Set interface)
HashMap (or anything implementing the Map interface)
both are found in java.util.
Hope this helps.