Mastermind / Parse string with error handling ....

Ok I am not going to hide the fact this looks like a homework question, honestly I already handed it in and now this is bothering me that I couldn't figure it out.......
We had to make a mastermind client/server game only using text no graphical everything runs fine but how would one do error catching on this. (code posted below)
Basically the user types in the command "guess r r r r" (guessing that the secret code is red four times ) and it parses it and assigns guess[] with the r and checks it based on the randomly generated color. The problem that I have is that is if someone makes a typo for example guess r rr r. How would one stop it from crashing from an out of bounds array request?
if (command.matches("guess.*"))
                           int white = 0;
                           int black = 0;
                           String phrase = command;
                           String delims = "[ ]+";
                           String[] guess = { null, null, null, null, null, null, null };
                           guess = phrase.split(delims);
                           for (int i = 0; i < 4; i++)
                                if (color.equalsIgnoreCase(guess[i+1]))
                         black++;
                    else if (color[i].equalsIgnoreCase(guess[i+1]))
                         white++;
                    else if (color[i].equalsIgnoreCase(guess[i+1]))
                         white++;
                    else if (color[i].equalsIgnoreCase(guess[i+1]))
                         white++;
               if (black == 4)
                    anwser = "You WIN!!!!!!!! KIRBY DOES A SPECIAL DANCE FOR YOU \n (>'.')> (^'.'^) <('.'<) \n";
                    gamePlaying = false;
                    commandChecker = true;
               else
                    turn++;
                    commandChecker = true;
                    anwser = "You got " + black + " black and " + white + " white it is your " + turn + " turn \n";
               if (turn >= 10)
                    anwser = "You Lost =( , try again, the anwser was " + color[0] + color[1] + color[2] + color[3] + "\n";
                    gamePlaying = false;

cotton.m wrote:
if(guess.length!=4){
// do something else besides evaluating the guesses. because something went wrong
I should add that usually the best way of avoid array index out of bounds exceptions is to avoid ever hardcoding things like
for(int i=0;i<4;i++)The 4 there is dangerous.
It's safer to use the length
for(int i=0;i<guess.length;i++)And the same applies to List(s) and the size method. Again usually that's a better idea but in your specific case anything more or less than 4 is not only a looping problem it would cause logical errors in the rest of your code... it is an exceptional case and should be dealt with specifically in your code.

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Mastermind / Parse string with error handling ....

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