无法将动作侦听器添加到JButton [英] Unable to Add an Action Listener to JButton
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问题描述
我几年来没有碰到Java，现在我回来了，试图做一个GUI来测试JFrame。我试图创建一个JButton将单击关闭程序。使用当前代码我收到错误javax.swing.AbstractButton类型中的方法addActionListener（java.awt.event.ActionListener）不适用于参数（new ActionListener（）{}） 。我发现的其他问题处理多个类或其他问题，不帮助我的问题。任何解决方案或替代品将不胜感激。
import javax.swing。*;
import java.awt。*;
public class testFrame
{
public static void main（String args []）
{
long base = System.currentTimeMillis（）;
JFrame frame = new JFrame（Test Window）;
frame.setLocationRelativeTo（null）;
frame.setUndecorated（true）;
frame.setExtendedState（JFrame.MAXIMIZED_BOTH）;
frame.setVisible（true）;
JLabel label = new JLabel（）;
JLabel label2 = new JLabel（我要多长时间运行？
JButton button = new JButton（EXIT）;
button.addActionListener（new ActionListener（）{
public void actionPerformed（ActionEvent e）{
JFrame.dispose（）;
}
}）;
Box box = Box.createVerticalBox（）;
box.add（label2）;
box.add（label）;
box.add（button）;
label2.setAlignmentX（Component.CENTER_ALIGNMENT）;
label.setAlignmentX（Component.CENTER_ALIGNMENT）;
button.setAlignmentX（Component.CENTER_ALIGNMENT）;
frame.getContentPane（）。add（box，BorderLayout.CENTER）;
while（true）
{
long input = System.currentTimeMillis（）;
label.setText（Long.toString（input - base））;
}
}
}
解决方案
-
总是在
import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowEvent;
import javax.swing.Box;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.SwingUtilities;
import javaxueswing.Timer;
public class TestFrame {
public static void main（String args []）{
SwingUtilities.invokeLater（new Runnable（）{
@Override
public void run（）{
JFrame frame = new JFrame（Test Window）;
frame.setDefaultCloseOperation（JFrame.EXIT_ON_CLOSE）;
//frame.setUndecorated ）;
//frame.setExtendedState(JFrame.MAXIMIZED_BOTH）;
Box box = Box.createVerticalBox（）;
JLabel time = new JLabel（0）;
time .setAlignmentX（Component.CENTER_ALIGNMENT）;
JLabel label = new JLabel（我多久运行一次？）;
label.setAlignmentX（Component.CENTER_ALIGNMENT）;
JButton button = new JButton（EXIT）;
button.setAlignmentX（Component.CENTER_ALIGNMENT）;
button.addActionListener（new ActionListener（）{
@Override
public void actionPerformed（ActionEvent e） {
frame.dispatchEvent（new WindowEvent（
frame，WindowEvent.WINDOW_CLOSING））;
}
}）;
box.add（label）;
box.add（time）;
box.add（button）;
frame.add（box，BorderLayout.CENTER）;
frame.pack（）;
frame.setLocationRelativeTo（null）;
frame.setVisible（true）;
long base = System.currentTimeMillis（）;
timer timer = new Timer（100，new ActionListener（）{
@Override
public void actionPerformed（ActionEvent e）{
long input = System.currentTimeMillis（）;
time.setText（Long.toString（input-base））;
}
}）;
timer.start（）;
}
}）;
}
}
I haven't touched Java in a few years and now I'm back, trying to make a GUI to test out JFrame. I am attempting to create a JButton that will close the program when clicked. With the current code I am receiving the error
"The method addActionListener(java.awt.event.ActionListener) in the type javax.swing.AbstractButton is not applicable for the arguments (new ActionListener(){})". The other questions I have found deal with multiple classes or other issues that don't help with my problem. Any solution or alternative would be appreciated.import javax.swing.*; import java.awt.*; public class testFrame { public static void main(String args[]) { long base = System.currentTimeMillis(); JFrame frame = new JFrame("Test Window"); frame.setLocationRelativeTo(null); frame.setUndecorated(true); frame.setExtendedState(JFrame.MAXIMIZED_BOTH); frame.setVisible(true); JLabel label = new JLabel(); JLabel label2 = new JLabel("How Long Have I Been Running?"); JButton button = new JButton("EXIT"); button.addActionListener(new ActionListener(){ public void actionPerformed (ActionEvent e) { JFrame.dispose(); } }); Box box = Box.createVerticalBox(); box.add(label2); box.add(label); box.add(button); label2.setAlignmentX(Component.CENTER_ALIGNMENT); label.setAlignmentX(Component.CENTER_ALIGNMENT); button.setAlignmentX(Component.CENTER_ALIGNMENT); frame.getContentPane().add(box, BorderLayout.CENTER); while(true) { long input = System.currentTimeMillis(); label.setText(Long.toString(input - base)); } } }解决方案I changed some things to get your program going.
Always build Swing programs on the event dispatch thread.
Use a Swing
Timerto make something happen every once in a while; running a loop flat out just makes the room hotter.Use
JFrame.EXIT_ON_CLOSEfor the default close operation, and send aWINDOW_CLOSINGevent from your EXIT button.Call
setVisible()after you add components andpack()the frame.
import java.awt.BorderLayout; import java.awt.Component; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.WindowEvent; import javax.swing.Box; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.SwingUtilities; import javax.swing.Timer; public class TestFrame { public static void main(String args[]) { SwingUtilities.invokeLater(new Runnable() { @Override public void run() { JFrame frame = new JFrame("Test Window"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //frame.setUndecorated(true); //frame.setExtendedState(JFrame.MAXIMIZED_BOTH); Box box = Box.createVerticalBox(); JLabel time = new JLabel("0"); time.setAlignmentX(Component.CENTER_ALIGNMENT); JLabel label = new JLabel("How Long Have I Been Running?"); label.setAlignmentX(Component.CENTER_ALIGNMENT); JButton button = new JButton("EXIT"); button.setAlignmentX(Component.CENTER_ALIGNMENT); button.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { frame.dispatchEvent(new WindowEvent( frame, WindowEvent.WINDOW_CLOSING)); } }); box.add(label); box.add(time); box.add(button); frame.add(box, BorderLayout.CENTER); frame.pack(); frame.setLocationRelativeTo(null); frame.setVisible(true); long base = System.currentTimeMillis(); Timer timer = new Timer(100, new ActionListener() { @Override public void actionPerformed(ActionEvent e) { long input = System.currentTimeMillis(); time.setText(Long.toString(input - base)); } }); timer.start(); } }); } }这篇关于无法将动作侦听器添加到JButton的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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