java 一个动作监听器，两个 JButton
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One action listener, two JButtons
提问by CodyBugstein
I have two JButtonscalled "Left" and "Right".
The "Left" button moves a rectangle object to the left and the "Right" button moves it to the right.
I have one ActionListenerin the class that acts as the listener for when either button is clicked.
However I want different actions to happen when each are clicked. How can I distinguish, in the ActionListener, between which was clicked?
我有两个JButtons叫做“左”和“右”。“左”按钮将矩形对象向左移动，“右”按钮将其向右移动。我ActionListener在类中有一个充当单击任一按钮时的侦听器。但是，我希望在单击每个操作时发生不同的操作。在 中ActionListener，我如何区分哪些被点击了？
回答by Amarnath
Set actionCommandto each of the button.
将actionCommand设置为每个按钮。
// Set the action commands to both the buttons.
// 为两个按钮设置动作命令。
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;
}
}
UPDATE:
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;
}
}
}
回答by Hyman
Quite easy with the getSource()method available to ActionEvent:
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) {
}
}
