123. }

124.

125. });

126. context.add(numPanel,"Center");

127.

128. // 操作面板

129. opPanel.setSize(50,300);

130. opPanel.setLayout(new GridLayout(4,1,5,5)); 131. opPanel.add(btnPlus);

132. opPanel.add(btnMinus);

133. opPanel.add(btnX);

134. opPanel.add(btnEqu);

135. btnPlus.addActionListener(btnListener); 136. btnPlus.addKeyListener(keyListener);

137. btnMinus.addActionListener(btnListener); 138. btnMinus.addKeyListener(keyListener); 139. btnX.addActionListener(btnListener); 140. btnX.addKeyListener(keyListener); 141. btnEqu.addActionListener(new ActionListener(){

142.

143. public void

actionPerformed(ActionEvent e) {

144. pressEqualButton(); 145. }

146.

147. });

148. btnEqu.addKeyListener(keyListener); 149. context.add(opPanel,"East");

150. }

151.

152. /**

153. * 创建数字按钮

154. * @param n 按钮上的数字

155. * @return 创建的按钮

156. */

157. public JButton getNumberButton(final int n){ 158. JButton btn = new JButton(String.valueOf(n));

159. btn.setSize(30,50);

160. btn.addActionListener(btnListener); 161. btn.addKeyListener(keyListener);

162. return btn;

163. }