如果我创建了以下JButton,只用一个ActionListener监听这10个JButton要用什么方法确定事件源？
JButton b1 = new JButton ("+");
JButton b2 = new JButton ("-");
JButton b3 = new JButton ("+");
JButton b4 = new JButton ("-");
JButton b5 = new JButton ("+");
JButton b6 = new JButton ("-");
JButton b7 = new JButton ("+");
JButton b8 = new JButton ("-");
JButton b9 = new JButton ("+");
JButton b10 = new JButton ("-");

private class bListener implements ActionListener
{
public void actionPerformed (ActionEvent e)
{
if (e.getActionCommand() == "+");
if (e.getActionCommand() == "-"); //getActionCommand()方法只能监听2个JButton.
}
}

getSource()是获取对象的引用的吧？这10个JButton只有2种引用，好像不行。而且我用过这方法，不行.

这10个JButton的作用是不同的。。。