在JPanel中執行ActionListener

Question

在這裏，我想在按下按鈕時執行一個動作，這很容易，但主要問題是要在擴展的JPanel中執行。 可能有一個簡單的解決方案，像添加動作偵聽器到特定的按鈕，並調用actionperformed事件，但我的情況是不是這樣，我有4個按鈕（t1，t2，t3，t4）所有這些按鈕將在一個單一ActionPerfomed事件ae（查看代碼段）。後來你可以看到調用另一個JButtons tr和rf的代碼，調用actionlistener和actionperformed事件。

清晰易懂，你可以在代碼一覽...

class Tracker extends JPanel 
{ 

public static void main(String[] args) { 
    new Tracker(); } 

public Tracker() 
{ 

JButton tr=new JButton("TRACKER APPLET"); 
tr.setBounds(720,170,100,20); 

JButton rf=new JButton("REFRESH"); 
rf.setBounds(200,170,100,20); 

boolean tc1=false,tc2=false,tc3=false,tc4=false; 

JButton t1=new JButton(" "); 
t1.addActionListener(this); 
JButton t2=new JButton(" "); 
t2.addActionListener(this); 
JButton t3=new JButton(" "); 
t3.addActionListener(this); 
JButton t4=new JButton(" "); 
t4.addActionListener(this); 


public void actionPerformed(ActionEvent ae) 
{ 
    if(ae.getSource()==t1) 
    { 
      tc1=true; 
    } 
    if(ae.getSource()==t2) 
    { 
      tc2=true; 
    } 
    if(ae.getSource()==t3) 
    { 
      tc3=true; 
    } 
    if(ae.getSource()==t4) 
    { 
      tc4=true; 
    } 

} 


tr.addActionListener(new ActionListener(){ 
public void actionPerformed(ActionEvent e){ 

    EventQueue.invokeLater(new Runnable() { 
     @Override 
     public void run() { 
      try { 
       UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); 
      } catch (ClassNotFoundException ex){} 
      catch(InstantiationException ex){} 
      catch(IllegalAccessException ex){} 
      catch(UnsupportedLookAndFeelException ex) {} 

       //some food here.... 


          } 
         }); 
      } 
      });   

    rf.addActionListener(new ActionListener(){ 
public void actionPerformed(ActionEvent e){ 

    EventQueue.invokeLater(new Runnable() { 
     @Override 
     public void run() 
     { 
      try { 
       UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); 
       } 
      catch (ClassNotFoundException ex){} 
      catch(InstantiationException ex){} 
      catch(IllegalAccessException ex){} 
      catch(UnsupportedLookAndFeelException ex) {} 
         //some extra work runs here... 
     } 
    }); 
} 
    }); 
add(tr); 
add(rf); 
add(t1); 
add(t2); 
add(t3); 
add(t4); 
} 

這裏我的問題是我無法實現ActionListener作爲已經擴展JPanel的主類。 我只是想與Jbuttons ::一起按照時間順序按下按鈕（t1 | t2 | t3 | t4）和JButtons（tr | rf）來執行單個動作。

在此先感謝..

Answer 1

class Tracker extends JPanel implements ActionListener 

你的代碼中包含了一些方法進入方法...

此代碼：

import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 

import javax.swing.JButton; 
import javax.swing.JFrame; 
import javax.swing.JPanel; 

public class Tracker extends JPanel implements ActionListener { 
    public Tracker() { 
     tr.setBounds(720, 170, 100, 20); 
     tr.addActionListener(this); 

     rf.setBounds(200, 170, 100, 20); 
     rf.addActionListener(this); 

     t1.addActionListener(this); 
     t2.addActionListener(this); 
     t3.addActionListener(this); 
     t4.addActionListener(this); 
     add(tr); 
     add(rf); 
     add(t1); 
     add(t2); 
     add(t3); 
     add(t4); 
    } 

    @Override 
    public void actionPerformed(ActionEvent e) { 
     Object src = e.getSource(); 
     if(src == t1) { 
     tc1 = true; 
     } 
     else if(src == t2) { 
     tc2 = true; 
     } 
     else if(src == t3) { 
     tc3 = true; 
     } 
     else if(src == t4) { 
     tc4 = true; 
     } 
     else if(src == tr) { 

     } 
     else if(src == rf) { 

     } 
    } 

    private final JButton tr = new JButton("TRACKER APPLET"); 
    private final JButton rf = new JButton("REFRESH"); 
    private final JButton t1 = new JButton(" "); 
    private final JButton t2 = new JButton(" "); 
    private final JButton t3 = new JButton(" "); 
    private final JButton t4 = new JButton(" "); 
    boolean tc1 = false, tc2 = false, tc3 = false, tc4 = false; 

    public static void main(String[] args) { 
     JFrame frame = new JFrame(""); 
     frame.add(new Tracker()); 
     frame.pack(); 
     frame.setLocationRelativeTo(null); 
     frame.setVisible(true); 
    } 
}