NullPointerException

[s0meb0dy]

I'm trying to make a program. I'm using a while loop to keep asking for a name and when "done" is entered it exits the loop. It stores the names in an array and prints it out as you enter it. I cant get it to exit the loop.
This is the Source Code:

import java.util.*;

public class TimeCard {

    public static void main(String sArgs[]){

		Scanner oScan = new Scanner(System.in);
		String[] aStudentNames = new String[150];
		final String[] sDone = {"done"};
		int iA = 0;
		while(aStudentNames[iA].compareToIgnoreCase(sDone[0]) > 0 || aStudentNames[iA].compareToIgnoreCase(sDone[0]) < 0){
			System.out.println("What is your name?");

			aStudentNames[iA] = oScan.nextLine();

			System.out.println(aStudentNames[iA]);
            ++iA;
		}





    }


}

[eRaaaa]

while(aStudentNames[iA].compareToIgnoreCase(sDone[0]) > 0 || aStudentNames[iA].compareToIgnoreCase(sDone[0]) < 0)

its shorter to write

while(!aStudentNames[iA].equalsIgnoreCase("done"))

(an array with only one string makes no sense in my opinion)
So your problem is, that you access aStudentNames[iA] before you store the name on that array position. use maybe a do-while-loop instead of a normal while-loop.
Maybe:

		Scanner oScan = new Scanner(System.in);
		String[] aStudentNames = new String[150];
		int iA = 0;
		do {
			System.out.println("What is your name?");
			aStudentNames[iA] = oScan.nextLine();
			System.out.println(aStudentNames[iA]);
		} while (!aStudentNames[iA++].equalsIgnoreCase("done"));

but you store "done" in your array too, dont know if you really want this :)

		Scanner oScan = new Scanner(System.in);
		String[] aStudentNames = new String[150];
		int iA = 0;
		while(iA<149){
			System.out.println("What is your name?");
			String s =  oScan.nextLine();
			if("done".equalsIgnoreCase(s)){
				break;
			}
			aStudentNames[iA] =s;
			System.out.println(aStudentNames[iA++]);
		}

[s0meb0dy]

Thanks I'll try that!

[s0meb0dy]

It worked. Thanks a lot!