For your first lab, you will create a Java program that allows two people to play a game of Connect 4 with each other.  Rules of the game (and a one-player flash applet) can be found at Milton Bradley's site here.  A full description of the game sans flash can be found at wikipedia.

Program output:

Your program should print the board, ask for a move from black, print the board, ask for a move for red, and so on, until either one of the players has won, or until the board is completley filled in, with no legal moves remaining.  Your program should check for errors in input, allowing players to try again if they enter a bad move.  A sample session might be:

0123456
.......
.......
.......
.......
.......
.......
.......
Enter a position to play, Red:3
0123456
.......
.......
.......
.......
.......
.......
...R...
Enter a position to play, Black:4
0123456
.......
.......
.......
.......
.......
.......
...RB..
Enter a position to play, Red:3
0123456
.......
.......
.......
.......
.......
...R...
...RB..
Enter a position to play, Black:4
0123456
.......
.......
.......
.......
.......
...RB..
...RB..
Enter a position to play, Red:3
0123456
.......
.......
.......
.......
...R...
...RB..
...RB..
Enter a position to play, Black:4
0123456
.......
.......
.......
.......
...RB..
...RB..
...RB..
Enter a position to play, Red:3
0123456
.......
.......
.......
...R...
...RB..
...RB..
...RB..
Red Wins

A different sample run might be:

0123456
.......
.......
.......
.......
.......
.......
.......
Enter a position to play, Red:3
0123456
.......
.......
.......
.......
.......
.......
...R...
Enter a position to play, Black:3
0123456
.......
.......
.......
.......
.......
...B...
...R...
Enter a position to play, Red:3
0123456
.......
.......
.......
.......
...R...
...B...
...R...
Enter a position to play, Black:3
0123456
.......
.......
.......
...B...
...R...
...B...
...R...
Enter a position to play, Red:3
0123456
.......
.......
...R...
...B...
...R...
...B...
...R...
Enter a position to play, Black:3
0123456
.......
...B...
...R...
...B...
...R...
...B...
...R...
Enter a position to play, Red:3
0123456
...R...
...B...
...R...
...B...
...R...
...B...
...R...
Enter a position to play, Black:3
Illegal move, try again.
0123456
...R...
...B...
...R...
...B...
...R...
...B...
...R...
Enter a position to play, Black:0
0123456
...R...
...B...
...R...
...B...
...R...
...B...
B..R...
Enter a position to play, Red:4
0123456
...R...
...B...
...R...
...B...
...R...
...B...
B..RR..
Enter a position to play, Black:0
0123456
...R...
...B...
...R...
...B...
...R...
B..B...
B..RR..
Enter a position to play, Red:5
0123456
...R...
...B...
...R...
...B...
...R...
B..B...
B..RRR.
Enter a position to play, Black:0
0123456
...R...
...B...
...R...
...B...
B..R...
B..B...
B..RRR.
Enter a position to play, Red:6
0123456
...R...
...B...
...R...
...B...
B..R...
B..B...
B..RRRR
Red Wins