Is it a bug in JDK1.3?

Question

Here's a simple program that I compiled and executed by using JDK1.3. The program had worked all very well as long as I typed in 'C' , 'P', 'N', 'A', 'b', or other single characters. Just by curiosity, I kept keying 'c' for 6 or 7 times and of course the computer kept telling me "Entry must be C or P or N!". After that, when I key in 'C', 'P', or 'N' again, strange things happened. I was still confronted with the same message as if I had keyed in invalid characters. The situation lasted until after I typed the command java ChooseManager. Then I got the correct response for the last 'C', 'P' or 'N' that I had entered. Is it a bug in JDK1.3?
Here is the program:
public class ChooseManager
static final double CORP_RATE = 75.99;
static final double PRI_RATE = 47.99;
static final double NON_PROF_RATE = 40.99;
public static void main(String[] args) throws Exception
     char eventType;
     Chap4Event anEvent;
     System.out.println("Enter type of event you are scheduling");
     System.out.println("C for a corporate event");
     System.out.println("P for a private event");
     System.out.println("N for non-profit event");
     eventType=(char)System.in.read();
     while(eventType != 'C' && eventType != 'P' && eventType != 'N')
          System.in.read(); System.in.read();
          System.out.println("Entry must be C or P or N!");
          eventType = (char)System.in.read();
     System.out.print("The manager for this event will be ");
     switch (eventType)
          case 'C':
          System.out.println("Dustin Britt");
          anEvent = new Chap4Event(eventType, CORP_RATE);
          break;
          case 'P':
          System.out.println("Carmen Lindsey");
          anEvent = new Chap4Event(eventType, PRI_RATE);
          break;
          default:
          System.out.println("Robin Armanetti");
          anEvent = new Chap4Event(eventType, NON_PROF_RATE);
          break;
     System.out.println("Event type is " + anEvent.getEventType());
     System.out.println("Minimum rate charged is $" + anEvent.getEventMinRate());

Answer 1

HELP, jsalonen. Something wrong with Readerbuffer. Why complier state can't resolve class:reader, InputStreamReader and BufferedReader ? Must I input something first?
public class PetAdvice
     public static void main(String[] args) throws Exception
          char resiType;
          char hour;
          System.out.println("Please cateory your residence type");
          System.out.println("'A' for apartment;");
          System.out.println("'H' for house;");
          System.out.println("'D' for dormiory;");
          Reader resiType = new InputStreamReader(System.in);
          BufferedReader in = new BufferedReader(reader);
          String inputLine = in.readLine();
          while(!(inputLine.equals("A") |
               inputLine.equals("H") |
               inputLine.equals("D")))
               {   System.out.println("entry: "+inputLine+" Entry must be A or H or D");
          inputLine = in.readLine();
          System.out.println("Please specify the average hours you will spend at home.");
          System.out.println("A) 18 or more;");
          System.out.println("B) 10 to 17;");
          System.out.println("C) 8 to 9;");
System.out.println("D) 6 to 7;");
          System.out.println("E) 0 to 5;");
          hour = (char)System.in.read();
          while (hour != 'A' && hour != 'B' && hour != 'C' && hour != 'D' && hour != 'E')
System.in.read(); System.in.read();
               System.out.println("Invalid input, pls choose again.");
               resiType = (char)System.in.read();
if (resiType == 'H' && hour == 'A')
System.out.println("Our recommendation is Pot bellied pig");
          else if (resiType == 'H' && (hour == 'B' || hour == 'C'))
               System.out.println("Our recommendation is Dog.");
          else if (resiType == 'H' && (hour == 'D' || hour == 'E'))
          System.out.println("Our recommendation is Snake.");
          else if (resiType == 'A' && (hour == 'A' || hour == 'B' ))
          System.out.println("Our recommendation is Cat.");
          else if (resiType == 'A' && (hour =='C' || hour == 'D' || hour == 'E'))
          System.out.println("Our recommendation is Hamster.");
          else if (resiType == 'D' && (hour == 'D' || hour == 'C' || hour == 'B' || hour == 'A'))
          System.out.println("Our recommendation is Fish.");
          else if (resiType == 'D' && hour == 'E')
          System.out.println("Our recommendation is Ant Farm.");
          else
               System.out.println("Sorry, no recommendation currently.");