Prentice.Hall.Introduction.to.Java.Programming,.Brief.Version.9th.(2014).[sharethefiles.com]

690 Chapter 18 Applets and Multimedia
register listener
paint cell
listener class
main method omitted
79 public Cell() {
80 setBorder(new LineBorder(Color.black, 1)); // Set cell's border
81 addMouseListener(new MyMouseListener()); // Register listener
82 }
83
84 /** Return token */
85 public char getToken() {
86 return token;
87 }
88
89 /** Set a new token */
90 public void setToken(char c) {
91 token = c;
92 repaint();
93 }
94
95 @Override /** Paint the cell */
96 protected void paintComponent(Graphics g) {
97 super.paintComponent(g);
98
99 if (token == 'X') {
100 g.drawLine(10, 10, getWidth() - 10, getHeight() - 10);
101 g.drawLine(getWidth() - 10, 10, 10, getHeight() - 10);
102 }
103 else if (token == 'O') {
104 g.drawOval(10, 10, getWidth() - 20, getHeight() - 20);
105 }
106 }
107
108
109
private class MyMouseListener extends MouseAdapter {
@Override /** Handle mouse click on a cell */
110 public void mouseClicked(MouseEvent e) {
111 // If cell is empty and game is not over
112 if (token == ' ' && whoseTurn != ' ') {
113 setToken(whoseTurn); // Set token in the cell
114
115 // Check game status
116 if (isWon(whoseTurn)) {
117 jlblStatus.setText(whoseTurn + " won! The game is over");
118 whoseTurn = ' '; // Game is over
119 }
120 else if (isFull()) {
121 jlblStatus.setText("Draw! The game is over");
122 whoseTurn = ' '; // Game is over
123 }
124 else {
125 // Change the turn
126 whoseTurn = (whoseTurn == 'X') ? 'O' : 'X';
127 // Display whose turn
128 jlblStatus.setText(whoseTurn + "'s turn");
129 }
130 }
131 }
132 }
133 }
134 }
The TicTacToe class initializes the user interface with nine cells placed in a panel of
GridLayout (lines 19–22). A label named jlblStatus is used to show the status of the
game (line 14). The variable whoseTurn (line 8) is used to track the next type of token to be