Java-Actionlistener：从父级获取组件 [英] Java - Actionlistener: Get components from parent

问题描述

到目前为止，我发现激活动作事件时获取其他组件信息的唯一方法是：

 （（Swing Component）ActionEvent.getSource（））。getParent（）。getComponent（---）。method（）; 
  

虽然它起作用了，但并不实用或难以理解，更何况如果我在父组件中移动了这些组件。

那么解决这个问题的最佳方法是什么？

解决方案

让监听器成为一个内在的东西吗？

解决方案

类，并直接访问该组件：

 私有JLabel标签； 
私人JButton按钮； 
 
 MyPanel（）{
 ... 
 button.addActionListener（new ActionListener（）{
 @Override 
 public void actionPerformed（ActionEvent e）{ 
 label.setText（ clicked clicked）; 
} 
} 
} 
  

http://docs.oracle.com /javase/tutorial/uiswing/events/intro.html

内部类主要是出于特定原因而发明的。

The only way I found so far to get other components' info when an actionevent is activated is by doing the following:

((Swing Component)ActionEvent.getSource()).getParent().getComponent(---).method();

and while it work it's not that practical or readable, not to mention would most likely stop working properly if I moved around the components in the parent component.

So what is the best way to go about this? Should I even use an actionlistener to begin with or are there better classes/design for this purpose?

解决方案

Make the listener an inner class, and access the component directly:

private JLabel label;
private JButton button;

MyPanel() {
    ...
    button.addActionListener(new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent e) {
            label.setText("button clicked");
        }
    }
}

http://docs.oracle.com/javase/tutorial/uiswing/events/intro.html

Inner classes were invented mainly for that specific reason.

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