你怎么知道actionevent是否是在运行时由按钮或文本字段生成的？

Question

如何知道actionevent是否是在运行时按钮或文本字段生成的？

Answer 1

使用getSource()检查触发事件的组件。

final JButton b = new JButton("Button");
final JTextField f = new JTextField("TextField");

ActionListener l = new ActionListener() {

    @Override
    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == b) {
            /* button fired the event */
        }

        if (e.getSource() == f) {
            /* text field fired the event */
        }
    }
};

b.addActionListener(l);
f.addActionListener(l);

Answer 2

还可以使用actionCommands来区分两者。

JButton button = new JButton("Button");
JTextField field = new JTextField("TextField");

ActionListener listener = new ActionListener() {
    @Override
    public void actionPerformed(ActionEvent event) {
        String command = event.getActionCommand();
        if (command.equals("myButton") {
            //Button stuff
        }

        if (command.equals("myField") {
            //Field stuff
        }
    }
};

button.addActionListener(listener);
button.setActionCommand("myButton");

field.addActionListener(listener);
field.setActionCommand("myField");