一个动作监听器,两个JButtons

Question

我有两个JButtons叫做"左"和"右"."向左"按钮向左移动一个矩形对象,"向右"按钮向右移动矩形对象.我ActionListener在类中有一个作为单击任一按钮时的监听器.但是,我希望在单击每个动作时发生不同的操作.我如何区分,ActionListener点击之间？

Answer 1

将actionCommand设置为每个按钮.

//将操作命令设置为两个按钮.

 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;
        }
    }
}

Answer 2

使用以下getSource()方法非常简单ActionEvent:

JButton leftButton, rightButton;

public void actionPerformed(ActionEvent e) {
  Object src = e.getSource();

  if (src == leftButton) {

  }
  else if (src == rightButton) {

  }
}