java JLabel 点击事件
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/4894112/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
JLabel click event
提问by jjj
If you have two JLabels in a JFrameboth with the same MouseListenerclick event added to them, how can you tell which JLabelwas clicked without creating a second actionlistener?
如果你有两个JLabelsJFrame都添加了相同的MouseListener点击事件，你如何JLabel在不创建第二个 actionlistener 的情况下判断哪个被点击了？
Note: both labels have the same text written on them so that cannot be used to tell them apart.
注意：两个标签上都写有相同的文字，因此无法区分它们。
回答by Romain Hippeau
This will get you a reference to the component ...
这将为您提供对组件的引用......
public void mousePressed(MouseEvent e)
{
JComponent reference = e.getComponent();
}
For a more complete description look at the Swing Tutorial on MouseListeners
有关更完整的描述，请查看MouseListeners上的Swing 教程
回答by ColinD
Just make the two JLabels fields and then check the source of the MouseEvent:
只需制作两个JLabels 字段，然后检查 的来源MouseEvent：
if (e.getSource() == firstLabel) {
...
} else if (e.getSource() == secondLabel) {
...
}
回答by user2276611
Since you are using JLabel which comes from JComponent it has a method called putClientProperty("myValue", myValue). You could put some unique identifier in there upon JLabel creation and retrieve it at event time with getClientProperty("myValue") and then test it.
由于您使用的是来自 JComponent 的 JLabel，它有一个名为 putClientProperty("myValue", myValue) 的方法。您可以在创建 JLabel 时在其中放置一些唯一标识符，并在事件时间使用 getClientProperty("myValue") 检索它，然后对其进行测试。
回答by Ephraim
take for example, a keyboard. what I did when I created one, is sent over the button to the action listener. I then had the action listener do a myButton.getText(); and I would just type the text onto my screen (a JTextfield in my case). in your main method write:
以键盘为例。我在创建一个时所做的，通过按钮发送到动作侦听器。然后我让动作监听器做一个 myButton.getText(); 我只会在我的屏幕上输入文本（在我的例子中是 JTextfield）。在你的主要方法中写：
JTextField textfield = new JTextField("", 37);
JButton myButton = new new JButton("button text here");
myButton.addActionListener(new MyActionListener (textfield, myButton));
the full action listener would look like this:
完整的动作侦听器如下所示：
//thisMethod is for a keyboard typing into a JTextfield
import javax.swing.JTextField;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.lang.*;
class MyActionListener implements ActionListener {
JTextField textfield;
MyActionListener(JTextField textfield, JButton button) {
this.textfield = textfield;
}
public void actionPerformed(ActionEvent e) {
String letter = javax.xml.bind.DatatypeConverter.printString(textfield.getText()).concat(button.getText());
textfield.setText (letter);
}
}
this same priciple applies when refering to which button was pressed. you could send over a string, and that string could be used in conditional statements to determine which button was pressed.
当提到按下了哪个按钮时，同样的原则也适用。您可以发送一个字符串，该字符串可以在条件语句中使用以确定按下了哪个按钮。
