Why doesn't this program work?  Specifically, you can answer yes, the
'Debug' line confirms that answer is "yes", but you still get the
third message.  I tried using a StringTokenizer as well, and that
didn't help.  Here is the program:

import java.io.*;

public class AnswerTest {
   public static void main (String[] args) throws Exception {
      System.out.println("Please enter yes or no.");

      BufferedReader br = 
         new BufferedReader(new InputStreamReader(System.in));
      String answer = br.readLine();

      System.out.println("Debug: answer = \"" + answer + "\".");

      if (answer == "yes" || answer == "Yes") 
         System.out.println("You said yes.");
      else if (answer == "no" || answer == "No")
         System.out.println("You said no.");
      else
         System.out.println("You said something else.");
   }
}