我有一些JButton，我设置了动作侦听器，但是当它们被按下时它们仍然不起作用。我希望他们在按下时调用方法。其中一些是未实现的（按下时不应该做任何事情）但我在谈论if语句中的那些不起作用。请帮忙！
这是我的代码：
package com.robot;
import java.awt.AWTException;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.IOException;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.ScrollPaneConstants;
public class GUI extends JFrame implements Runnable {
//defines the panels
JPanel mainPanel;
JPanel labelPanel;
JPanel buttonPanel1;
JPanel buttonPanel2;
JPanel consolePanel;
//defines the label
JLabel title;
//defines the buttons
JButton runDemo;
JButton runLive;
JButton scan;
JButton findPatterns;
JButton cleanFolder;
JButton configureSettings;
//defines the console
JTextArea console;
//defines the line break
String newline = System.getProperty("line.separator");
//start of the constructor method for GUI
public GUI() {
//makes the program unable to be resized
this.setResizable(false);
//allows the user to close the program with the x button
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//sets the title of the program
this.setTitle("ROBOT Alpha Alfred Version 3.0");
//creates panels to hold the elements of the GUI
mainPanel = new JPanel();
labelPanel = new JPanel();
buttonPanel1 = new JPanel();
buttonPanel2 = new JPanel();
consolePanel = new JPanel();
//creates label
title = new JLabel("Robotically Operated Binary Options Trader");
//creates buttons
runDemo = new JButton("Run Demo");
runLive = new JButton("Run Live");
scan = new JButton("Scan Market");
findPatterns = new JButton("Find Patterns");
cleanFolder = new JButton("Clean Up Folder");
configureSettings = new JButton("Configure Settings");
//defines button listener objects
ButtonListener buttonListener = new ButtonListener();
//adds buttons to button listeners
runDemo.addActionListener(buttonListener);
//creates the console
console = new JTextArea(6, 40);
//sets the default text of the console
console.setText("----------------------- ROBOT Console -----------------------" + newline);
//makes the console unable to be edited
console.setEditable(false);
//sets the line wrapping of the console
console.setLineWrap(true);
console.setWrapStyleWord(true);
//creates scroll bars
JScrollPane scrollBar = new JScrollPane(console);
scrollBar.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED);
scrollBar.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED);
//adds label to the label panel
labelPanel.add(title);
//adds buttons to the button panel
buttonPanel1.add(runDemo);
buttonPanel1.add(runLive);
buttonPanel2.add(scan);
buttonPanel2.add(findPatterns);
buttonPanel2.add(cleanFolder);
buttonPanel2.add(configureSettings);
//adds the console to the console panel
consolePanel.add(scrollBar);
//adds panels to the main panel
mainPanel.add(labelPanel);
mainPanel.add(buttonPanel1);
mainPanel.add(buttonPanel2);
mainPanel.add(consolePanel);
//adds the main panel to the frame
this.add(mainPanel);
//packs the GUI
this.pack();
//sizes the GUI
this.setSize(600, 400);
//centers the GUI
this.setLocationRelativeTo(null);
//sets the GUI to be visible
this.setVisible(true);
}
public void run() {
}
public void add(String string) {
console.append(string + newline);
}
//implement listeners
private class ButtonListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
if(e.getSource() == runDemo) {
} else if(e.getSource() == runLive) {
} else if(e.getSource() == scan) {
try {
ScanMarket.scanMarket();
} catch (IOException e1) {
e1.printStackTrace();
} catch (InterruptedException e1) {
e1.printStackTrace();
} catch (AWTException e1) {
e1.printStackTrace();
}
} else if(e.getSource() == findPatterns) {
try {
FindPattern.findPattern("Images");
} catch (AWTException e1) {
e1.printStackTrace();
} catch (IOException e1) {
e1.printStackTrace();
} catch (InterruptedException e1) {
e1.printStackTrace();
}
} else if(e.getSource() == cleanFolder) {
AddNeededFiles.addNeededFiles();
} else if(e.getSource() == configureSettings) {
}
}
}
}
这是动作监听器类，以便您可以更仔细地查看它：
//implement listeners
private class ButtonListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
if(e.getSource() == runDemo) {
} else if(e.getSource() == runLive) {
} else if(e.getSource() == scan) {
try {
ScanMarket.scanMarket();
} catch (IOException e1) {
e1.printStackTrace();
} catch (InterruptedException e1) {
e1.printStackTrace();
} catch (AWTException e1) {
e1.printStackTrace();
}
} else if(e.getSource() == findPatterns) {
try {
FindPattern.findPattern("Images");
} catch (AWTException e1) {
e1.printStackTrace();
} catch (IOException e1) {
e1.printStackTrace();
} catch (InterruptedException e1) {
e1.printStackTrace();
}
} else if(e.getSource() == cleanFolder) {
AddNeededFiles.addNeededFiles();
} else if(e.getSource() == configureSettings) {
}
}
}
非常感谢你的帮助！
答案 0 :(得分：0)
您添加ActionListener的唯一按钮是runDemo，而当runDemo是源时，您不会执行任何操作。
答案 1 :(得分：0)
您必须将按钮监听器添加到它应该收听的所有按钮。目前，您只是将其添加到runDemo按钮
//adds buttons to button listeners
runDemo.addActionListener(buttonListener);
runLive.addActionListener(buttonListener);
scan.addActionListener(buttonListener);
findPatterns.addActionListener(buttonListener);
cleanFolder.addActionListener(buttonListener);
configureSettings.addActionListener(buttonListener);
答案 2 :(得分：0)
您需要使用调试器来查看按下按钮是否正常工作。
您应该在那里放置一个断点并按照步骤进行操作。
这是一个eclipse调试器教程（http://www.vogella.com/tutorials/EclipseDebugging/article.html）
此外，您似乎没有将听众附加到所有按钮上。
答案 3 :(得分：0)
除了@Behe提到的内容之外，您还可以为按钮设置动作命令，以便更容易找出按下的按钮：
runDemo = new JButton("Run Demo");
runDemo.addActionListener(new buttonListener());
runDemo.setActionCommand("rundemo");
runLive = new JButton("Run Live");
runLive.addActionListener(new buttonListener());
runLive.setActionCommand("runlive");
scan = new JButton("Scan Market");
scan.addActionListener(new buttonListener());
scan.setActionCommand("scan");
...
public void actionPerformed(ActionEvent e) {
String action = e.getActionCommand(); // Get the action.
if ( action.equalsIgnoreCase("rundemo") ) { // Run Demo