将动作添加到由另一个JButton创建的JButton

我有一个Jbutton，当按下时会创建另一个按钮，并且新按钮被添加到面板中。 如何将actionListener添加到新按钮？

例如：

JButton button = new JButton("lala"); button.addActionListener(this); public void actionPerformed(ActionEvent event) { if (event.getSource() == button) { JButton newButton = new JButton("ahah"); newButton.addActionListener(this); } } 

我想为newButton添加动作，我该怎么办？

编辑代码：

  public void actionPerformed(ActionEvent event) { if (event.getSource() == button) { String name = tfOne.getText(); Icon flag = new ImageIcon("flag/"+name+".png"); JButton[] newButton = new JButton[click]; newButton[click-1] = new JButton(name, flag); p2.add(newButton[click-1]); newButton[click-1].addActionListener(new aListener()); p2.setLayout(new GridLayout(5+click,1)); //p2 is a panel that has been created setSize(500,450+(click*20)); click++; //number of times the button is pressed } } public class aListener extends MouseAdapter { public void mouseClicked(MouseEvent e) { tfOne.setText("lala"); } } 

代码组织不好，但这或多或少都是我想做的

Answer 1

一种方法是让内部类包含监听器：

 public void actionPerformed(ActionEvent event) { if (event.getSource() == button) { JButton newButton = new JButton("ahah"); newButton.addMouseListener(new yourListener()); } } //add this class as a inner class public class aListener extends MouseAdapter { public void mouseClicked(MouseEvent e) { JButton buttonReference=(JButton)e.getSource(); // you want this since hardcoding the name of the button is bad if you want listeners for more then one button buttonReference.setText("lala"); } } 

这将创建yourListener的一个实例，并在单击它时将其添加到按钮

Answer 2

对于每个按钮，您可以创建自己的actionPerformed(...)方法，如下例所示：您的意思是这样做：

 import java.awt.*; import java.awt.event.*; import javax.swing.*; public class ButtonAction { private JPanel contentPane; private JButton updateButton; private int count = 0; private ActionListener updateListener = new ActionListener() { public void actionPerformed(ActionEvent ae) { final JButton button = new JButton("" + count); button.setActionCommand("" + count); button.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent event) { System.out.println("My COMMAND is : " + event.getActionCommand()); } }); SwingUtilities.invokeLater(new Runnable() { public void run() { contentPane.add(button); contentPane.revalidate(); contentPane.repaint(); } }); count++; } }; private void createAndDisplayGUI() { JFrame frame = new JFrame("BUTTON ACTIONS"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setLocationByPlatform(true); contentPane = new JPanel(); contentPane.setLayout(new FlowLayout(FlowLayout.LEFT, 5, 5)); updateButton = new JButton("UPDATE GUI"); updateButton.addActionListener(updateListener); frame.add(contentPane, BorderLayout.CENTER); frame.add(updateButton, BorderLayout.PAGE_END); frame.pack(); frame.setVisible(true); } public static void main(String... args) { Runnable runnable = new Runnable() { public void run() { new ButtonAction().createAndDisplayGUI(); } }; SwingUtilities.invokeLater(runnable); } } 

Answer 3

newButton实例需要填写其actionPerformed方法。 我看到你有一个ActionListener添加到按钮，但这只是意味着有人列出了操作。 您在上面显示的代码没有定义对该newButton任何操作，因此没有事件被触发，并且ActionListener永远不会得到任何通知。