Need some help on my HS Project

Code Java:

// import java.text.*;
import java.util.*;
public class charcount
{
	public static void main (String[] args)
	{
		Scanner keyboard = new Scanner(System.in);
		String line = "";
		String ch = "";
		int numLetter, numVowel, numDigit, numBlank, numPunct, numOther, numLine, num;
		boolean value = true;
 
		System.out.println("Enter \" DONE \" when you are through.");
 
		while (value = true)
		{
			System.out.print("Enter a Line of text or DONE: ");
			line = keyboard.nextLine();
			line = line.toUpperCase();
			ch.equals(line.charAt(num));
 
			if (line.equals("DONE"))
				value = false;
				break;
			if ((ch >= 'A') && (ch <= 'Z'))
				numLetter += 1;
			if (ch == 'A' || ch == 'E' || ch == 'I' || ch == 'O' || ch == 'Y')
				numVowel += 1;
 
		}
	}
}
public static void main(String[] args)
{
}

I cannot get this program to run. It seems that I can not use the < or > sign with my variable char. I thought that ch was primitive and I could use those signs but I am very new to this language and I am sure I am doing something wrong. I am trying to get the first letter of a string and find out if it is a letter and a vowel. No rush not due until Friday plus I will ask my instructor tomorrow if no one responds.
Thank You.