Java JCombobox 和 JButton 问题

Question

我目前正在为计算机科学类(class)开发一个项目，但遇到了问题。我有多个按钮和 2 个组合框，我希望它们都能彼此独立工作。不幸的是，每当我按下按钮时，它都会充当“选择”按钮并激活组合框中当前选择的任何内容!我怎样才能解决这个问题？我的代码片段如下

public void actionPerformed(ActionEvent e) {
  // Sound Menu
  String soundSelect = (String)soundBox.getSelectedItem();
  int soundIndex = soundBox.getSelectedIndex();
    switch (soundIndex){
      case 0:
        stopClip(meowSong);
        stopClip(meowRemix);
        ImageIcon catDel = new ImageIcon(getClass().getResource("tres-quatro.png"));
        delEvent.setIcon(catDel);
        ImageIcon catAdd = new ImageIcon(getClass().getResource("im-hungry.png"));
        addEvent.setIcon(catAdd);
        break;
      case 1:
        stopClip(meowRemix);
        playMeow(meowSong);
        catDel = new ImageIcon(getClass().getResource("tres-quatro.png"));
        delEvent.setIcon(catDel);
        catAdd = new ImageIcon(getClass().getResource("im-hungry.png"));
        addEvent.setIcon(catAdd);
        break;
      case 2:
        stopClip(meowSong);
        playMeow(meowRemix);
        ImageIcon thugCat = new ImageIcon(getClass().getResource("tres-quatro-thug.png"));
        delEvent.setIcon(thugCat);
        ImageIcon hungryThug = new ImageIcon(getClass().getResource("im-hungry-thug.png"));
        addEvent.setIcon(hungryThug);
        break;
    }


  // View Menu
    String viewSelect = (String)viewTypes.getSelectedItem();
    if(e.getActionCommand().equals("ADD EVENT"))
    {
        playMeow(meowSound);
        createEvent();
      }else if(e.getActionCommand().equals("DELETE EVENT"))
        {
            playMeow(meowSound);
            deleteEvent();
        }else{
          panel.remove(displayMessage2);
          panel.add(displayMessage);
          panel.remove(text);
        }

    int selection = viewTypes.getSelectedIndex();
         switch (selection)
         {
          case 0: displayMessage.setText("Enter the Sunday of the week you'd like to view! DD/MM");
                  panel.add(text);
                  panel.add(enter);
                  String date = text.getText();
                  if(e.getActionCommand().equals("Enter")){
                    weeklyCalendar(calendar.getHashmap(), date);
                    displayMessage.setText("Select a CATlendar view or you can ADD or DELETE an event!");
                    panel.remove(text);
                    panel.remove(enter);
                  }
                  break;
          case 1: displayMessage.setText("Enter the date you'd like to view! DD/MM");
                  panel.add(text);
                  panel.add(enter);
                  date = text.getText();
                  if(e.getActionCommand().equals("Enter")){
                    playMeow(meowSound);
                    dailyCalendar(calendar.getHashmap(), date);
                    displayMessage.setText("Select a CATlendar view or you can ADD or DELETE an event!");
                    panel.remove(text);
                    panel.remove(enter);
                  }
                  break;
        case 2: displayMessage.setText("Press Enter to view monthly");
                panel.remove(text);
                panel.add(enter);
                if(e.getActionCommand().equals("Enter")){
                  monthlyCalendar();
                  displayMessage.setText("Select a CATlendar view or you can ADD or DELETE an event!");
                  panel.remove(enter);
                }
                break;
           }

    panel.revalidate();
    panel.repaint();
    SwingUtilities.windowForComponent(panel).pack();
}

Answer 1

whenever I press a button it works as a "select" button and activates whatever is currently selected in the combobox

这就是 ActionListener 代码的作用。无论哪个组件生成 ActionEvent，您始终都会执行 switch 语句。

为每个组件创建单独的 ActionListener，而不是尝试为所有组件共享单个 ActionListener。然后代码将针对每个组件而特定，并且不需要 if 语句来确定哪个组件生成了事件。

编辑:

How can you have individual actionListeners for each component?

1. 您可以创建一个实现 ActionListener 接口(interface)的内部类

   comboBox.addActionListener( new MyComboBoxListener() );
   
   ...
   
   class MyComboBoxListener implements ActionListener
   {
       @Override
       public void actionPerformed(ActionEvent e)
       {
           // add your code here
       }
   }
   

2. 您可以使用匿名内部类

   comboBox.addActionListenener( new ActionListener()
   {
       @Override
       public void actionPerformed(ActionEvent e)
       {
           // add your code here
       }
   });