Swing I - Absolute Java - page 1014

Use a FlowLayout with a JTextArea for the source text and a separate JTextArea
for the translated text. Add a JButton with an event to perform the translation.
A sample application is shown next with the text translated to Pig Latin.
To parse the source text, note that you can use the Scanner class on a String . For
example the following code
Scanner scan = new Scanner("foo bar zot");
while (scan.hasNext())
{
System.out.println(scan.next());
}
will output

foo
bar
zot
2. Design and code a Swing GUI for a two-player tic-tac-toe (noughts and crosses)
game on a 3

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

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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 program should indicate that there
is a tie.
3. Design and code a Swing GUI calculator. You can use Display 17.19 as a starting
point, but your calculator will be more sophisticated. Your calculator will have
two text fields that the user cannot change: One labeled "Result" will contain 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 buttons
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 following occurs: 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 suit-
able message to the "Operand" text field. The user may then enter a new substitute

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