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java - 为什么 ActionListener 不起作用？

转载 作者：行者123 更新时间：2023-12-01 22:29:18 26 4
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我一直在尝试做这个，它确实有效，除了当我单击按钮时没有任何反应，这是一个大学项目。

我需要知道的是如何使按钮按预期工作，使我编码的功能能够执行。

 /*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package proyecto;

import java.awt.Color;
import java.awt.Component;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JComponent;



/**
 *
 * @author Cristian
 */
public class Diseños extends JComponent implements ActionListener {

   JButton Boton1, Boton2, Boton3, Boton4, Boton5, Boton6, Boton7;





  @Override
  public void paint(Graphics g) {    


    this.Boton1=new JButton("-"); 
    this.Boton1.setBounds(90, 410, 30, 30); 
    this.Boton1.setBackground(Color.black);
    Component agregar1 = add(Boton1);



    this.Boton2=new JButton("-"); 
    this.Boton2.setBounds(150, 410, 30, 30); 
    this.Boton2.setBackground(Color.BLACK);
    Component agregar2 = add(Boton2);

    this.Boton3 =new JButton("-"); 
    this.Boton3.setBounds(210, 410, 30, 30); 
    this.Boton3.setBackground(Color.BLACK);
    Component agregar3 = add(Boton3);

    this.Boton4=new JButton("-"); 
    this.Boton4.setBounds(270, 410, 30, 30); 
    this.Boton4.setBackground(Color.BLACK);
    Component agregar4 = add(Boton4);

    this.Boton5=new JButton("-"); 
    this.Boton5.setBounds(330, 410, 30, 30); 
    this.Boton5.setBackground(Color.BLACK);
    Component agregar5 = add(Boton5);

    this.Boton6=new JButton("-"); 
    this.Boton6.setBounds(390, 410, 30, 30); 
    this.Boton6.setBackground(Color.BLACK);
    Component agregar6 = add(Boton6);

    this.Boton7=new JButton("-"); 
    this.Boton7.setBounds(450, 410, 30, 30); 
    this.Boton7.setBackground(Color.BLACK);
    Component agregar7 = add(Boton7);

    g.drawRect (570, 10, 300, 200);
    g.setColor(Color.BLACK);
    g.fillRect(570, 10, 300, 200);
    g.drawRect (570, 250, 300, 200);
    g.setColor(Color.BLACK);
    g.fillRect(570, 250, 300, 200);
    g.setColor(Color.WHITE);
    Font oldFont=getFont();
    Font fuente=new Font("Primer Jugador", Font.BOLD, 14);
    g.setFont(fuente);
    g.drawString("Primer Jugador", 580, 30);
    Font titulo=new Font("Segundo Jugador", Font.BOLD, 14);
    g.setFont(titulo);
    g.drawString("Segundo Jugador", 580, 270);
    g.drawString("[ " + Proyecto.primernombre + " ]", 580, 50);
    g.drawString("[ " + Proyecto.segundonombre + " ]", 580, 290);
    g.setColor(Color.red);
    g.fillRoundRect(10, 5, 550, 450, 50, 50);
    g.setColor(Color.WHITE);
    g.fillOval(80, 50, 50, 50);
    g.fillOval(140, 50, 50, 50);
    g.fillOval(200, 50, 50, 50);
    g.fillOval(260, 50, 50, 50);
    g.fillOval(320, 50, 50, 50);
    g.fillOval(380, 50, 50, 50);
    g.fillOval(440, 50, 50, 50);
    g.fillOval(80, 110, 50, 50);
    g.fillOval(140, 110, 50, 50);
    g.fillOval(200, 110, 50, 50);
    g.fillOval(260, 110, 50, 50);
    g.fillOval(320, 110, 50, 50);
    g.fillOval(380, 110, 50, 50);
    g.fillOval(440, 110, 50, 50);
    g.fillOval(80, 170, 50, 50);
    g.fillOval(140, 170, 50, 50);
    g.fillOval(200, 170, 50, 50);
    g.fillOval(260, 170, 50, 50);
    g.fillOval(320, 170, 50, 50);
    g.fillOval(380, 170, 50, 50);
    g.fillOval(440, 170, 50, 50);
    g.fillOval(80, 230, 50, 50);
    g.fillOval(140, 230, 50, 50);
    g.fillOval(200, 230, 50, 50);
    g.fillOval(260, 230, 50, 50);
    g.fillOval(320, 230, 50, 50);
    g.fillOval(380, 230, 50, 50);
    g.fillOval(440, 230, 50, 50);
    g.fillOval(80, 290, 50, 50);
    g.fillOval(140, 290, 50, 50);
    g.fillOval(200, 290, 50, 50);
    g.fillOval(260, 290, 50, 50);
    g.fillOval(320, 290, 50, 50);
    g.fillOval(380, 290, 50, 50);
    g.fillOval(440, 290, 50, 50);
    g.fillOval(80, 350, 50, 50);
    g.fillOval(140, 350, 50, 50);
    g.fillOval(200, 350, 50, 50);
    g.fillOval(260, 350, 50, 50);
    g.fillOval(320, 350, 50, 50);
    g.fillOval(380, 350, 50, 50);
    g.fillOval(440, 350, 50, 50);
}

    @Override
     public void actionPerformed (ActionEvent ae){       
        if(ae.getSource().equals(Boton1) && turno.Tjugador == true && colores.colorjugador[0] == 1 && matrices.matrizraya[0] == 6) {
            System.out.println("I doubt this is even working");
            turno.Tjugador = false;
            matrices.matrizraya[0] --;           
            getGraphics().setColor(Color.RED);
            getGraphics().fillOval(80, 350, 50, 50);
            repaint();
        }

    }
}

编辑:我一直在重新测试并且代码可以工作，但只有当我不使用 if 时，这是为什么？

编辑:好的，我解决了按钮问题，但我得到了一个新按钮，当我尝试更改 Boton61 的背景颜色时，出现此错误:

线程“AWT-EventQueue-0”中出现异常 java.lang.NullPointerException 在 proyecto.Diseños.actionPerformed(Diseños.java:364)

package proyecto;


import java.awt.Color;
import java.awt.Component;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JComponent;



/**
 *
 * @author Cristian
 *
 * */

public class Diseños extends JComponent implements ActionListener {

   JButton Boton1, Boton2, Boton3, Boton4, Boton5, Boton6, Boton7;

   JButton Boton11,Boton21,Boton31,Boton41,Boton51,Boton61;
   JButton Boton12,Boton22,Boton32,Boton42,Boton52,Boton62;
   JButton Boton13,Boton23,Boton33,Boton43,Boton53,Boton63;
   JButton Boton14,Boton24,Boton34,Boton44,Boton54,Boton64;
   JButton Boton15,Boton25,Boton35,Boton45,Boton55,Boton65;
   JButton Boton16,Boton26,Boton36,Boton46,Boton56,Boton66;
   JButton Boton17,Boton27,Boton37,Boton47,Boton57,Boton67;




   @Override
  public void paintComponent(Graphics g) {    
     Boton1=new JButton("lol"); 
    Boton1.setBounds(90, 410, 30, 30); 
    Boton1.setBackground(Color.black);
    Component agregar1 = add(Boton1);
    Boton1.addActionListener(new Diseños());


    Boton2=new JButton("lol"); 
    Boton2.setBounds(150, 410, 30, 30); 
    Boton2.setBackground(Color.black);
    Component agregar2 = add(Boton2);
    Boton2.addActionListener(new Diseños());

    Boton3=new JButton("lol"); 
    Boton3.setBounds(210, 410, 30, 30); 
    Boton3.setBackground(Color.black);
    Component agregar3 = add(Boton3);
    Boton3.addActionListener(new Diseños());

    Boton4=new JButton("lol"); 
    Boton4.setBounds(270, 410, 30, 30); 
    Boton4.setBackground(Color.black);
    Component agregar4 = add(Boton4);
    Boton4.addActionListener(new Diseños());

    Boton5=new JButton("lol"); 
    Boton5.setBounds(330, 410, 30, 30); 
    Boton5.setBackground(Color.black);
    Component agregar5 = add(Boton5);
    Boton5.addActionListener(new Diseños());

    Boton6=new JButton("lol"); 
    Boton6.setBounds(390, 410, 30, 30); 
    Boton6.setBackground(Color.black);
    Component agregar6 = add(Boton6);
    Boton6.addActionListener(new Diseños());

    Boton7=new JButton("lol"); 
    Boton7.setBounds(450, 410, 30, 30); 
    Boton7.setBackground(Color.black);
    Component agregar7 = add(Boton7);
    Boton7.addActionListener(new Diseños());


    Boton11=new JButton(""); 
    Boton11.setBounds(85, 10, 40, 60); 
    Boton11.setBackground(Color.white);
    Component agregar11 = add(Boton11);
    Boton11.addActionListener(new Diseños());

    Boton21=new JButton(""); 
    Boton21.setBounds(85, 70, 40, 60); 
    Boton21.setBackground(Color.white);
    Component agregar21 = add(Boton21);
    Boton21.addActionListener(new Diseños());

    Boton31=new JButton(""); 
    Boton31.setBounds(85, 130, 40, 60); 
    Boton31.setBackground(Color.white);
    Component agregar31 = add(Boton31);
    Boton31.addActionListener(new Diseños());

    Boton41=new JButton(""); 
    Boton41.setBounds(85, 190, 40, 60); 
    Boton41.setBackground(Color.white);
    Component agregar41 = add(Boton41);
    Boton41.addActionListener(new Diseños());

    Boton51=new JButton(""); 
    Boton51.setBounds(85, 250, 40, 60); 
    Boton51.setBackground(Color.white);
    Component agregar51 = add(Boton51);
    Boton51.addActionListener(new Diseños());

    Boton61=new JButton(""); 
    Boton61.setBounds(85, 310, 40, 60); 
    Boton61.setBackground(Color.white);
    Component agregar61 = add(Boton61);
    Boton61.addActionListener(new Diseños());

    Boton12=new JButton(""); 
    Boton12.setBounds(145, 10, 40, 60); 
    Boton12.setBackground(Color.white);
    Component agregar12 = add(Boton12);
    Boton12.addActionListener(new Diseños());

    Boton22=new JButton(""); 
    Boton22.setBounds(145, 70, 40, 60); 
    Boton22.setBackground(Color.white);
    Component agregar22 = add(Boton22);
    Boton22.addActionListener(new Diseños());

    Boton32=new JButton(""); 
    Boton32.setBounds(145, 130, 40, 60); 
    Boton32.setBackground(Color.white);
    Component agregar32 = add(Boton32);
    Boton32.addActionListener(new Diseños());

    Boton42=new JButton(""); 
    Boton42.setBounds(145, 190, 40, 60); 
    Boton42.setBackground(Color.white);
    Component agregar42 = add(Boton42);
    Boton42.addActionListener(new Diseños());

    Boton52=new JButton(""); 
    Boton52.setBounds(145, 250, 40, 60); 
    Boton52.setBackground(Color.white);
    Component agregar52 = add(Boton52);
    Boton52.addActionListener(new Diseños());

    Boton62=new JButton(""); 
    Boton62.setBounds(145, 310, 40, 60); 
    Boton62.setBackground(Color.white);
    Component agregar62 = add(Boton62);
    Boton62.addActionListener(new Diseños());

    Boton13=new JButton(""); 
    Boton13.setBounds(205, 10, 40, 60); 
    Boton13.setBackground(Color.white);
    Component agregar13 = add(Boton13);
    Boton13.addActionListener(new Diseños());

    Boton23=new JButton(""); 
    Boton23.setBounds(205, 70, 40, 60); 
    Boton23.setBackground(Color.white);
    Component agregar23 = add(Boton23);
    Boton23.addActionListener(new Diseños());

    Boton33=new JButton(""); 
    Boton33.setBounds(205, 130, 40, 60); 
    Boton33.setBackground(Color.white);
    Component agregar33 = add(Boton33);
    Boton33.addActionListener(new Diseños());

    Boton43=new JButton(""); 
    Boton43.setBounds(205, 190, 40, 60); 
    Boton43.setBackground(Color.white);
    Component agregar43 = add(Boton43);
    Boton43.addActionListener(new Diseños());

    Boton53=new JButton(""); 
    Boton53.setBounds(205, 250, 40, 60); 
    Boton53.setBackground(Color.white);
    Component agregar53 = add(Boton53);
    Boton53.addActionListener(new Diseños());

    Boton63=new JButton(""); 
    Boton63.setBounds(205, 310, 40, 60); 
    Boton63.setBackground(Color.white);
    Component agregar63 = add(Boton63);
    Boton63.addActionListener(new Diseños());

    Boton14=new JButton(""); 
    Boton14.setBounds(265, 10, 40, 60); 
    Boton14.setBackground(Color.white);
    Component agregar14 = add(Boton14);
    Boton14.addActionListener(new Diseños());

    Boton24=new JButton(""); 
    Boton24.setBounds(265, 70, 40, 60); 
    Boton24.setBackground(Color.white);
    Component agregar24 = add(Boton24);
    Boton24.addActionListener(new Diseños());

    Boton34=new JButton(""); 
    Boton34.setBounds(265, 130, 40, 60); 
    Boton34.setBackground(Color.white);
    Component agregar34 = add(Boton34);
    Boton34.addActionListener(new Diseños());

    Boton44=new JButton(""); 
    Boton44.setBounds(265, 190, 40, 60); 
    Boton44.setBackground(Color.white);
    Component agregar44 = add(Boton44);
    Boton44.addActionListener(new Diseños());

    Boton54=new JButton(""); 
    Boton54.setBounds(265, 250, 40, 60); 
    Boton54.setBackground(Color.white);
    Component agregar54 = add(Boton54);
    Boton54.addActionListener(new Diseños());

    Boton64=new JButton(""); 
    Boton64.setBounds(265, 310, 40, 60); 
    Boton64.setBackground(Color.white);
    Component agregar64 = add(Boton64);
    Boton64.addActionListener(new Diseños());

    Boton15=new JButton(""); 
    Boton15.setBounds(325, 10, 40, 60); 
    Boton15.setBackground(Color.white);
    Component agregar15 = add(Boton15);
    Boton15.addActionListener(new Diseños());

    Boton25=new JButton(""); 
    Boton25.setBounds(325, 70, 40, 60); 
    Boton25.setBackground(Color.white);
    Component agregar25 = add(Boton25);
    Boton25.addActionListener(new Diseños());

    Boton35=new JButton(""); 
    Boton35.setBounds(325, 130, 40, 60); 
    Boton35.setBackground(Color.white);
    Component agregar35 = add(Boton35);
    Boton35.addActionListener(new Diseños());

    Boton45=new JButton(""); 
    Boton45.setBounds(325, 190, 40, 60); 
    Boton45.setBackground(Color.white);
    Component agregar45 = add(Boton45);
    Boton45.addActionListener(new Diseños());

    Boton55=new JButton(""); 
    Boton55.setBounds(325, 250, 40, 60); 
    Boton55.setBackground(Color.white);
    Component agregar55 = add(Boton55);
    Boton55.addActionListener(new Diseños());

    Boton65=new JButton(""); 
    Boton65.setBounds(325, 310, 40, 60); 
    Boton65.setBackground(Color.white);
    Component agregar65 = add(Boton65);
    Boton65.addActionListener(new Diseños());

    Boton16=new JButton(""); 
    Boton16.setBounds(385, 10, 40, 60); 
    Boton16.setBackground(Color.white);
    Component agregar16 = add(Boton16);
    Boton16.addActionListener(new Diseños());

    Boton26=new JButton(""); 
    Boton26.setBounds(385, 70, 40, 60); 
    Boton26.setBackground(Color.white);
    Component agregar26 = add(Boton26);
    Boton26.addActionListener(new Diseños());

    Boton36=new JButton(""); 
    Boton36.setBounds(385, 130, 40, 60); 
    Boton36.setBackground(Color.white);
    Component agregar36 = add(Boton36);
    Boton36.addActionListener(new Diseños());

    Boton46=new JButton(""); 
    Boton46.setBounds(385, 190, 40, 60); 
    Boton46.setBackground(Color.white);
    Component agregar46 = add(Boton46);
    Boton46.addActionListener(new Diseños());

    Boton56=new JButton(""); 
    Boton56.setBounds(385, 250, 40, 60); 
    Boton56.setBackground(Color.white);
    Component agregar56 = add(Boton56);
    Boton56.addActionListener(new Diseños());

    Boton66=new JButton(""); 
    Boton66.setBounds(385, 310, 40, 60); 
    Boton66.setBackground(Color.white);
    Component agregar66 = add(Boton66);
    Boton66.addActionListener(new Diseños());

    Boton17=new JButton(""); 
    Boton17.setBounds(445, 10, 40, 60); 
    Boton17.setBackground(Color.white);
    Component agregar17 = add(Boton17);
    Boton17.addActionListener(new Diseños());

    Boton27=new JButton(""); 
    Boton27.setBounds(445, 70, 40, 60); 
    Boton27.setBackground(Color.white);
    Component agregar27 = add(Boton27);
    Boton27.addActionListener(new Diseños());

    Boton37=new JButton(""); 
    Boton37.setBounds(445, 130, 40, 60); 
    Boton37.setBackground(Color.white);
    Component agregar37 = add(Boton37);
    Boton37.addActionListener(new Diseños());

    Boton47=new JButton(""); 
    Boton47.setBounds(445, 190, 40, 60); 
    Boton47.setBackground(Color.white);
    Component agregar47 = add(Boton47);
    Boton47.addActionListener(new Diseños());

    Boton57=new JButton(""); 
    Boton57.setBounds(445, 250, 40, 60); 
    Boton57.setBackground(Color.white);
    Component agregar57 = add(Boton57);
    Boton57.addActionListener(new Diseños());

    Boton67=new JButton(""); 
    Boton67.setBounds(445, 310, 40, 60); 
    Boton67.setBackground(Color.white);
    Component agregar67 = add(Boton67);
    Boton67.addActionListener(new Diseños());

    super.paintComponent(g);
    g.drawRect (570, 10, 300, 200);
    g.setColor(Color.BLACK);
    g.fillRect(570, 10, 300, 200);
    g.drawRect (570, 250, 300, 200);
    g.setColor(Color.BLACK);
    g.fillRect(570, 250, 300, 200);
    g.setColor(Color.WHITE);
    Font oldFont=getFont();
    Font fuente=new Font("Primer Jugador", Font.BOLD, 14);
    g.setFont(fuente);
    g.drawString("Primer Jugador", 580, 30);
    Font titulo=new Font("Segundo Jugador", Font.BOLD, 14);
    g.setFont(titulo);
    g.drawString("Segundo Jugador", 580, 270);
    g.drawString("[ " + Proyecto.primernombre + " ]", 580, 50);
    g.drawString("[ " + Proyecto.segundonombre + " ]", 580, 290);
    g.setColor(Color.CYAN);
    g.fillRoundRect(10, 5, 550, 450, 50, 50);
  }


    @Override
    public void actionPerformed(ActionEvent ae) {
        System.out.println("Ayy lmao");
        Boton61.setBackground(Color.blue);
        Boton61.repaint();
    }
}


            Line 364 is :

Boton61.setBackground(Color.blue);

最佳答案

建议:

  • 将 ActionListener 添加到按钮。这里的意思是 Boton3.addActionListener(this);。
  • 您不应该以任何绘画方法创建组件或将它们添加到 GUI。诸如paint或paintComponent之类的绘画方法应该仅用于绘画和绘画。
    • 您无法直接控制何时甚至是否调用绘画方法，也无法控制调用它的次数，因此这使得它成为一个危险的使用场所用于更改 GUI 的组件。
    • 任何减慢绘制速度的行为都会使您的 GUI 显得响应速度较慢，而用户不会欣赏这一点。因此，绘画方法应力求精益和快速，并且再次应只涉及绘画。
  • 您不希望重写 JComponent 的 Paint 方法，而是重写其 PaintComponent 方法。
  • 不要在组件上调用getGraphics()，也不要尝试使用由此获得的 Graphics 对象进行绘制。这样做会给你一个短暂的 Graphics 对象，这将使你的绘图不稳定。相反，使用 JVM 提供给您的 Graphics 对象在 PaintComponent 方法中完成所有绘图。
  • 您可以通过在 BufferedImage 上调用 getGraphics() 并在 that 中进行绘制来绕过上述限制，但您仍然需要在 PaintComponent 方法中绘制 BufferedImage通过 g.drawImage(...) 方法。
  • 我自己会做不同的事情，包括创建一个使用 GridLayout 的 JPanel，该 GridLayout 包含带有圆形 ImageIcons 的 JLabels 和底部的 JButton。然后，当按下按钮时，我会交换 JLabel 中需要交换的 ImageIcons。由于不会对位置进行硬编码，因此维护和增强这一点会容易得多。
<小时/>

例如，您甚至可以取消 JButtons 列，转而使用 JLabels 网格，为它们提供一个 MouseListener 来检查 JLabel 所在的列，然后根据按下的列添加一个彩色磁盘: 

import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.GridLayout;
import java.awt.RenderingHints;
import java.awt.event.*;
import java.awt.image.BufferedImage;
import javax.swing.*;

@SuppressWarnings("serial")
public class Connect4Panel extends JPanel {
   public static final int ROWS = 6;
   public static final int COLUMNS = 7;
   public static final int DISK_WIDTH = 50;
   public static final int DISK_BORDER_WIDTH = 5;
   private static final Color FIRST_COLOR = Color.red;
   private static final Color SECOND_COLOR = Color.black;
   private Icon emptyIcon;
   private Icon firstIcon;
   private Icon secondIcon;
   private JLabel[][] diskGrid = new JLabel[ROWS][COLUMNS];
   private boolean firstTurn = true;

   public Connect4Panel() {
      emptyIcon = createIcons(new Color(0, 0, 0, 15));
      firstIcon = createIcons(FIRST_COLOR);
      secondIcon = createIcons(SECOND_COLOR);

      DiskListener diskListener = new DiskListener();
      // setBackground(Color.DARK_GRAY);
      setLayout(new GridLayout(ROWS, COLUMNS, 2, 0));
      for (int row = 0; row < diskGrid.length; row++) {
         for (int col = 0; col < diskGrid[row].length; col++) {
            JLabel disk = new JLabel(emptyIcon);
            disk.addMouseListener(diskListener);
            diskGrid[row][col] = disk;
            add(disk);
         }
      }
   }

   private Icon createIcons(Color color) {
      int width = DISK_WIDTH + 2 * DISK_BORDER_WIDTH;
      BufferedImage bImg = new BufferedImage(width, width, BufferedImage.TYPE_INT_ARGB);
      Graphics2D g2 = bImg.createGraphics();
      g2.setColor(color);
      g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
      int x = DISK_BORDER_WIDTH;
      int oWidth = DISK_WIDTH;
      g2.fillOval(x, x, oWidth, oWidth);
      g2.dispose();
      return new ImageIcon(bImg);
   }

   private class DiskListener extends MouseAdapter {
      @Override
      public void mousePressed(MouseEvent e) {
         JLabel disk = (JLabel) e.getSource();
         int selectedColumn = -1;
         for (int row = 0; row < diskGrid.length; row++) {
            for (int col = 0; col < diskGrid[row].length; col++) {
               if (disk == diskGrid[row][col]) {
                  selectedColumn = col;
               }
            }
         }

         for (int row = ROWS - 1; row >= 0; row--) {
            if (diskGrid[row][selectedColumn].getIcon() == emptyIcon) {
               Icon icon = firstTurn ? firstIcon : secondIcon;
               diskGrid[row][selectedColumn].setIcon(icon);
               firstTurn = !firstTurn;
               break;
            }
         }

         // TODO check for win
      }
   }

   private static void createAndShowGui() {
      Connect4Panel mainPanel = new Connect4Panel();

      JFrame frame = new JFrame("Connect 4 Panel");
      frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
      frame.getContentPane().add(mainPanel);
      frame.pack();
      frame.setLocationByPlatform(true);
      frame.setVisible(true);

      JOptionPane.showMessageDialog(frame, "Click on panel to see how it works!");
   }

   public static void main(String[] args) {
      SwingUtilities.invokeLater(new Runnable() {
         public void run() {
            createAndShowGui();
         }
      });
   }
}

关于java - 为什么 ActionListener 不起作用？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/28143599/

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