HW#3 --- last modified January 01 1970 00:00:00..

Solution set.

Due date: Mar 22

Files to be submitted:
  TicTacToe.java

Purpose: To gain practice in verifying forms using Javascript. To gain practice writing programs that maintain transaction state.

Specification:

For this homework you will write a servlet that lets the user play tic-tac-toe. If you do not know what tic-tac-toe is do a Google search on it. You will use hidden variables to maintain the current state of the game and you will verify any form data that is to be sent via Javascript before sending it. All forms for this assignment should use the Post method. When first accessed your tic-tac-toe servlet should return a page which says Welcome to the Tic-tac-toe game! Would you like to go first? What follows is then a text input field in which the user can type up to three characters and the a submit button. You should use Javascript to verify that the user enters one of something which when converted to lower case looks like y, yes, n, no before sending this data to the server. Turn taking then takes place to play a game between the user and the server. You should try to draw the tic-tac-toe board as realistically as possible using tables. The servlet is allowed to move any way you want as long as it always makes legal moves. When it is the user's turn, the user should see a game board and beneath it two texts fields and a submit button. One field should say x before it and the other should say y. The user then can enter the x and y coordinate of his move and click submit. At this point, Javascript is used to check to make sure the x and y values are in the range of the board (For example, 4 as an x value will not be on the board). It should also check that the move is a legal move. Your program should detect when the game end and inform the user and ask if he wants to play again.

Point Breakdown

1. One additional bonus point will be given if you can make all of the HTML pages your servlet generates XHTML 1.0 transitional compliant.

2. One additional bonus point will be given if your program plays perfect tic-tac-toe. (i.e., never loses)