java - 一个 Action 监听器，两个 JButton

Question

我有两个 JButtons，名为“Left”和“Right”。“左”按钮将矩形对象向左移动，“右”按钮将其向右移动。我在类中有一个 ActionListener，它充当任一按钮被单击时的监听器。但是，我希望在单击每个操作时发生不同的操作。我如何在 ActionListener 中区分哪个被点击？

Answer 1

设置actionCommand到每个按钮。

//为两个按钮设置 Action 命令。

 btnOne.setActionCommand("1");
 btnTwo.setActionCommand("2");

public void actionPerformed(ActionEvent e) {
 int action = Integer.parseInt(e.getActionCommand());

 switch(action) {
 case 1:
         //doSomething
         break;
 case 2: 
         // doSomething;
         break;
 }
}

更新:

public class JBtnExample {
    public static void main(String[] args) {
        JButton btnOne = new JButton();
        JButton btnTwo = new JButton();

        ActionClass actionEvent = new ActionClass();

        btnOne.addActionListener(actionEvent);
                btnTwo.addActionListener(actionEvent);

        btnOne.setActionCommand("1");
        btnTwo.setActionCommand("2");
    }
} 

class ActionClass implements ActionListener {

    @Override
    public void actionPerformed(ActionEvent e) {
        int action = Integer.parseInt(e.getActionCommand());
        switch (action) {
        case 1:
            // DOSomething
            break;
        case 2:
            // DOSomething
            break;                          
        default:
            break;
        }
    }
}