无法将动作侦听器添加到JButton | 无法将动作侦听器添加到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 Timer to make something happen every once in a while; running a loop flat out just makes the room hotter.
Use JFrame.EXIT_ON_CLOSE for the default close operation, and send a WINDOW_CLOSING event from your button.
Call setVisible() after you add components and pack() 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();
            }
        });
    }
}

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