java - Java 中两个类之间的事件处理程序

Question

我有兴趣从另一个类获取由多个组件生成的 ActionEvent...请帮助。下面给出了示例。

class MyFrame {
    public MyFrame() {
        JFrame window = new JFrame();
        Container c = window.getContentPane();
        c.setLayout(new BorderLayout());
        JButton btn1 = new JButton("Save");
        JButton btn2 = new JButton("Delete");
        c.add(btn1);
        c.add(btn2);
        EventHandler handler = new EventHandler();
        btn1.addActionListener(handler);
        btn2.addActionListener(handler);
        .................
    }
}
class EventHandler implements ActionListener {
    public void actionPerformed(ActionEvent ae)
    {
        // what can i do here to get Event and also recognized which component fired event?
        // I have used getSource(). but problem is not solved.
        if ( ae.getSource() == btnSave)
        {
        }
    }
}

请尽快帮助我...

Answer 1

一般来说，如果你有多个JButton，你可以为每个组件设置操作命令

...
btn1.addActionListener(handler);
btn1.setActionCommand("save");
btn2.addActionListener(handler);
btn2.setActionCommand("delete");
...

在处理程序中你可以获得操作命令

class EventHandler implements ActionListener {

    public void actionPerformed(ActionEvent ae){
        String actionCommand = ((JButton) ae.getSource()).getActionCommand();

        if (actionCommand.equals("save")) {
                ...
        }else if (actionCommand.equals("delete") {
                ...
        }
    }
}