JButton和actionPerformed方法可能在不同的文件中嗎？

Question

是否有可能在一個文件上有一個按鈕，並在另一個文件中使用actionPerformed（ActionEvent e）方法？我試圖添加一個actionListener到一個按鈕，choose1在文件trialdump.java中，但actionPerformed（ActionEvent e）方法在文件listen.java中。我試圖擴展公共類trialdump延伸監聽，但它顯示一個錯誤。任何想法如何將該方法添加到按鈕？謝謝。

這是我在文件trialdump.java代碼：

package Core; 

import javax.swing.GroupLayout; 
import javax.swing.JButton; 
import javax.swing.JFrame; 
import javax.swing.JLabel; 
import javax.swing.JPanel; 
import javax.swing.JTextArea; 
import javax.swing.JTextField; 
import javax.swing.SwingConstants; 
import javax.swing.*; 
import java.awt.*; 

// Create a simple GUI window 
public class trialdump { 

private static void createWindow() { 

    // Create and set up the window. 
    JFrame frame = new JFrame("PDF Denoiser"); 
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 

    // My edit 
    JPanel panel = new JPanel(); 
    GroupLayout layout = new GroupLayout(panel); 
    panel.setLayout(layout); 

    layout.setAutoCreateGaps(true); 
    layout.setAutoCreateContainerGaps(true); 

    JLabel label1 = new JLabel("Image File"); 
    JLabel label2 = new JLabel("Destination"); 
    JLabel label3 = new JLabel("Preview"); 

    JTextField current = new JTextField(); 
    JTextField dest = new JTextField(); 
    JTextArea preview = new JTextArea(); 

    preview.setEditable(false); 
    JScrollPane previewScrollPane = new JScrollPane(preview); 

    JButton choose1 = new JButton("Search1"); 
    JButton choose2 = new JButton("Search2"); 
    JButton algo1 = new JButton("MDWM"); 
    JButton algo2 = new JButton("BFMR"); 
    JButton algo3 = new JButton("Mine"); 



    // Horizontal arrangement 
    layout.setHorizontalGroup(layout 
      .createSequentialGroup() 
      .addGroup(
        layout.createParallelGroup(GroupLayout.Alignment.LEADING).addComponent(label1) 
          .addComponent(label2).addComponent(label3)) 
      .addGroup(
        layout.createParallelGroup(GroupLayout.Alignment.LEADING).addComponent(current) 
          .addComponent(dest).addComponent(preview)) 
      .addGroup(
        layout.createParallelGroup(GroupLayout.Alignment.LEADING).addComponent(choose1) 
          .addComponent(choose2).addComponent(algo1).addComponent(algo2).addComponent(algo3))); 

    layout.linkSize(SwingConstants.HORIZONTAL, choose1, choose2, algo1, algo2, algo3); 

    // Vertical arrangement 
    layout.setVerticalGroup(layout 
      .createSequentialGroup() 
      .addGroup(
        layout.createParallelGroup(GroupLayout.Alignment.BASELINE).addComponent(label1) 
          .addComponent(current).addComponent(choose1)) 
      .addGroup(
        layout.createParallelGroup(GroupLayout.Alignment.BASELINE).addComponent(label2) 
          .addComponent(dest).addComponent(choose2)) 
      .addGroup(
        layout.createParallelGroup(GroupLayout.Alignment.LEADING) 
          .addComponent(label3) 
          .addComponent(preview) 
          .addGroup(
            layout.createSequentialGroup().addComponent(algo1).addComponent(algo2) 
              .addComponent(algo3)))); 

    // Display the window. 
    frame.setLocationRelativeTo(null); 
    frame.add(panel); 
    frame.pack(); 
    frame.setVisible(true); 
} 

public static void main(String[] args) { 

    createWindow(); 

} 
} 

這裏是我的代碼在listen.java：

package components; 

import java.io.*; 
import java.awt.*; 
import java.awt.event.*; 
import javax.swing.*; 
import javax.swing.SwingUtilities; 
import javax.swing.filechooser.*; 

public class listen extends JPanel implements ActionListener{ 

static private String newline = "\n"; 
private JTextArea log; 
private JFileChooser fc; 

public listen() { 



} 

public void actionPerformed(ActionEvent e) { 
    //Set up the file chooser. 
    if (fc == null) { 
     fc = new JFileChooser(); 

    //Add a custom file filter and disable the default 
    //(Accept All) file filter. 
     fc.addChoosableFileFilter(new imagefilter()); 
     fc.setAcceptAllFileFilterUsed(false); 

    //Add custom icons for file types. 
     fc.setFileView(new imagefileview()); 

    //Add the preview pane. 
     fc.setAccessory(new imagepreview(fc)); 
    } 

    //Show it. 
    int returnVal = fc.showDialog(listen.this, 
            "Attach"); 

    //Process the results. 
    if (returnVal == JFileChooser.APPROVE_OPTION) { 
     File file = fc.getSelectedFile(); 

    } else { 
     log.append("Attachment cancelled by user." + newline); 
    } 
    log.setCaretPosition(log.getDocument().getLength()); 

    //Reset the file chooser for the next time it's shown. 
    fc.setSelectedFile(null); 
} 

/** 
* Create the GUI and show it. For thread safety, 
* this method should be invoked from the 
* event dispatch thread. 
*/ 


public static void main(String[] args) { 
    //Schedule a job for the event dispatch thread: 
    //creating and showing this application's GUI. 
    SwingUtilities.invokeLater(new Runnable() { 
     public void run() { 
      //Turn off metal's use of bold fonts 
      UIManager.put("swing.boldMetal", Boolean.FALSE); 

     } 
    }); 
} 
} 

Answer 1

您可以添加在另一個類中定義的監聽器，像這樣做

JButton choose1 = new JButton("Search1"); 
choose1.addActionListener(new listen()); 

BTW，你應該把你的代碼的一些位的護理：

• 班組長名稱應首字母大寫爲您的包
鍵入的第一個字母大寫
• 使用專有名詞
• 我認爲監聽器類中的主要方法不會使任何有用的東西
• 根本不需要在監聽器類中從JPanel擴展
• 儘量避免讓空的構造函數，就像你在listen（）中做的那樣。至少調用super（），或者只是，不包含它。

Answer 2

只是示例代碼，你可以對類似的變化行-

class Some extends JFrame { 

    private JButton button = new JButton("Something"); 

    Some() { 
     button.addActionListener(new MyListener()); 
    } 
} 

class MyListener implements ActionListener { 

    @Override 
    public void actionPerformed(ActionEvent e) { 
     // do something 
    }  
} 

Answer 3

這樣做的正確的方法是通過擴展的AbstractAction類中添加所有的動作代碼到它的actionPerformed方法，然後通過它的一個新的實例給JButton's構造函數之一或通過在JButton調用setAction。

這裏是一個link幫助清除它全部給你。