请问：buttonsign定义为一个JButton,那么，buttonsign.addActionListener(this)是什么意思？？

[Tsingwa]

请问：buttonsign定义为一个JButton,那么，buttonsign.addActionListener(this)是什么意思？？

[wwangl]

响应这个button的事件

[Tsingwa]

可以讲的再详细一点吗！
用鼠标响应

ImageIcon leftButtonIcon = new ImageIcon("images/right.gif");
ImageIcon middleButtonIcon = new ImageIcon("images/middle.gif");
ImageIcon rightButtonIcon = new ImageIcon("images/left.gif");

b1 = new JButton("Disable middle button", leftButtonIcon);
b1.setVerticalTextPosition(AbstractButton.CENTER);/**设置垂直文本位置*/
b1.setHorizontalTextPosition(AbstractButton.LEFT);/**设置水平文本位置*/
b1.setMnemonic(KeyEvent.VK_D);/**加一个键盘上的快捷键*/
b1.setActionCommand("disable");/**Sets the command name for the action event fired by this button.
By default this action command is set to match the label of the button*/

b2 = new JButton("Middle button", middleButtonIcon);
b2.setVerticalTextPosition(AbstractButton.BOTTOM);
b2.setHorizontalTextPosition(AbstractButton.CENTER);
b2.setMnemonic(KeyEvent.VK_M);

b3 = new JButton("Enable middle button", rightButtonIcon);
//Use the default text position of CENTER, RIGHT.
b3.setMnemonic(KeyEvent.VK_E);
b3.setActionCommand("enable");
b3.setEnabled(false);/**Sets the enabled state of the object,
if true, enables this object; otherwise, disables it*/

//Listen for actions on buttons 1 and 3.
b1.addActionListener(this)

[Tsingwa]

可以讲的再详细一点吗！
用鼠标响应吗？？


ImageIcon leftButtonIcon = new ImageIcon("images/right.gif");
ImageIcon middleButtonIcon = new ImageIcon("images/middle.gif");
ImageIcon rightButtonIcon = new ImageIcon("images/left.gif");

b1 = new JButton("Disable middle button", leftButtonIcon);
b1.setVerticalTextPosition(AbstractButton.CENTER);/**设置垂直文本位置*/
b1.setHorizontalTextPosition(AbstractButton.LEFT);/**设置水平文本位置*/
b1.setMnemonic(KeyEvent.VK_D);/**加一个键盘上的快捷键*/
b1.setActionCommand("disable");/**Sets the command name for the action event fired by this button.
By default this action command is set to match the label of the button*/

b2 = new JButton("Middle button", middleButtonIcon);
b2.setVerticalTextPosition(AbstractButton.BOTTOM);
b2.setHorizontalTextPosition(AbstractButton.CENTER);
b2.setMnemonic(KeyEvent.VK_M);

b3 = new JButton("Enable middle button", rightButtonIcon);
//Use the default text position of CENTER, RIGHT.
b3.setMnemonic(KeyEvent.VK_E);
b3.setActionCommand("enable");
b3.setEnabled(false);/**Sets the enabled state of the object,
if true, enables this object; otherwise, disables it*/

//Listen for actions on buttons 1 and 3.
b1.addActionListener(this)


未完！但就想问b1.addActionListener(this)是立即触发吗？？

[gflei]

看看事件监听应该就会明白的

想想你的button怎么通知，原因就在与此

[gflei]

奥，我明白你的意思了，在此并不立即触发，只有激发事件，才能触发，他的响应代码应该在actionPerforme(..)中