Java Reference
In-Depth Information
2.
Design and code a Swing GUI for a two-player tic-tac-toe (noughts and crosses)
game on a 3 by 3 game board. The
JFrame
should use a
BorderLayout
with a
JLabel
in the NORTH region to display messages (e.g., who won the game),
and a
JPanel
in the CENTER region to display the game board. For the game
board in the
JPanel
, use a
GridLayout
manager with a 3 by 3 layout of
JButton
's
in each cell to display the game board. The button labels should initially be
blank. When a player clicks on an empty button an appropriate “X” or “O”
should be placed in the label field of the button. If there is a winner (three in a
row) then the program should display the winner in the
JLabel
located at the
top of the window. If all nine cells have been filled without a winner the pro-
gram should indicate that there was a tie.
3.
Design and code a Swing GUI calculator. You can use Display 17.19 as a start-
ing point, but your calculator will be more sophisticated. Your calculator will
have two text fields that the user cannot change: One labeled
"Result"
will con-
tain the result of performing the operation, and the other labeled
"Operand"
will
be for the user to enter a number to be added, subtracted, and so forth from the
result. The user enters the number for the
"Operand"
text field by clicking but-
tons labeled with the digits
0
through
9
and a decimal point, just as in a real
calculator. Allow the operations of addition, subtraction, multiplication, and
division. Use a
GridLayout
manager to produce a button pad that looks similar
to the keyboard on a real calculator.
When the user clicks a button for an operation: the operation is performed, the
"Result"
text field is updated, and the
"Operand"
text field is cleared. Include a
button labeled
"Reset"
that resets the
"Result"
to
0.0
. Also include a button
labeled
"Clear"
that resets the
"Operand"
text field so it is blank.
Hint:
Define an exception class named
DivisonByZeroException
. Have your code
throw and catch a
DivisonByZeroException
if the user attempts to “divide by
zero.” Your code will catch the
DivisonByZeroException
and output a suitable
message to the
"Operand"
text field. The user may then enter a new substitute
number in the
"Operand"
text field. Since values of type
double
are, in effect,
approximate values, it makes no sense to test for equality with
0.0
. Consider an
operand to be “equal to zero” if it is in the range
−
1.0e
−
10
to
+1.0e
−
10
.
4.
(The Swing part of this project is pretty easy, but to do this programming project
you need to know how to convert numbers from one base to another.) Write a
program that converts integers from base ten (ordinary decimal) notation to base
two notation. Use Swing to perform input and output via a window interface. The
user enters a base ten numeral in one text field and clicks a button with
"Convert"
written on it; the equivalent base two numeral then appears in another text field.
Be sure to label the two text fields. Include a
"Clear"
button that clears both text
fields when clicked. (
Hint:
Include a private method that converts the string for a
base ten numeral to the string for the equivalent base two numeral.)
