JButton with actionPerformed and keyReleased

Question

我有一個JButton，我希望它在按下按鈕時執行某些操作，並且當按下某個按鍵時我希望它做同樣的事情，我該怎麼做？

Answer 1

做某事時按下按鈕，您應該添加一個ActionListener到該按鈕是這樣的：

JButton button = new JButton(); 
button.addActionListener(new ActionListener() { 

    @Override 
    public void actionPerformed(ActionEvent arg0) { 
     // TODO Auto-generated method stub 

    } 
}); 

並以響應按鍵做這樣的事情：（例如，如果用戶輸入控制ALT 7 ）

Action actionListener = new AbstractAction() { 
    public void actionPerformed(ActionEvent actionEvent) { 
    JButton source = (JButton) actionEvent.getSource(); 
    System.out.println("Activated: " + source.getText());// just for test 
    } 
}; 
//..... 

KeyStroke controlAlt7 = KeyStroke.getKeyStroke("control alt 7"); 
InputMap inputMap = button.getInputMap(); 
inputMap.put(controlAlt7, ACTION_KEY); 
ActionMap actionMap = button.getActionMap(); 
actionMap.put(ACTION_KEY, actionListener); 

Answer 2

據我所知（與Swing在幾年...），可以在一個按鈕動作的唯一按鍵事件是Tab從而改變了元素焦點，Enter沒有搞砸哪觸發actionPerformed方法和助記符，這也引發actionPerformed。

來處理按鈕點擊事件，你可以不喜歡這樣：

button.addActionListener(new ActionListener() { 

      public void actionPerformed(ActionEvent e) 
      { 
       //Execute when button is pressed 
      } 
     }); 

Answer 3

JButton button = new JButton("Submit"); 
    //Add action listener to button 
    button.addActionListener(new ActionListener() { 

     public void actionPerformed(ActionEvent e) 
     { 
      //Execute when button is pressed 
      //do your work here 
      System.out.println("You clicked the submit button"); 
     } 
    });  

這是如何使用的ActionListener與JButton的

Answer 4

你可能想看看進入Action API。你可以在How to Use Actions看到更多。您可以使用Action作爲按鈕（與ActionListener一樣工作），並且您可以向其添加快捷鍵。

您可以看到this example其中的快捷鍵被添加到工具欄按鈕以及菜單項。你想要注意的有趣的事情是菜單項和工具欄按鈕共享Action，因此做同樣的事情。

Answer 5

試試這個：

import java.awt.*; 
import java.awt.event.*; 
import javax.swing.*; 

public class EventedButtonExample extends JFrame { 
    private JButton simpleButton; 
    private static final long serialVersionUID = 42L; 

    public static void main(String[] args) { 
     SwingUtilities.invokeLater(new Runnable() { 
      public void run() { 
       EventedButtonExample me = new EventedButtonExample(); 
       me.initialize(); 
       me.setVisible(true); 
      } 
     }); 
    } 

    void initialize() { 
     simpleButton = new JButton("I am an simple, evented button!"); 
     CompoundEventHandler eh = new CompoundEventHandler(); 
     simpleButton.addActionListener(eh); 
     simpleButton.addKeyListener(eh); 
     getContentPane().add(simpleButton, BorderLayout.CENTER); 
     pack(); 
    } 

    class CompoundEventHandler extends KeyAdapter implements ActionListener { 
     public void keyReleased(KeyEvent e) { 
      int keyCode = e.getKeyCode(); 
      System.out.println("Key pressed: " + keyCode + " (" + KeyEvent.getKeyText(keyCode) + ")"); 
     } 

     public void actionPerformed(ActionEvent e) { 
      System.out.println("A button is pressed!"); 
     } 
    } 
}