在我的对话框中按下按钮时，不会调用java actionPerformed

Question

单击为“确定”和“取消”添加的按钮时，不会调用actionPerformed 代码：

void testServerFlags()
{

    dlgEmpty mdlgCreateBot = new dlgEmpty(null);
    
    mdlgCreateBot.show();
    ted=0;
    
}

import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

import javax.swing.Box;
import javax.swing.DefaultListModel;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.SwingConstants;

import Indicator.cGenIndicator;
import Indicator.cIndicatorUtil;
import MyLib.cLib;

public class dlgEmpty extends JDialog implements ActionListener
{
        Box parPan, topPan, butPan,centerPan;;
                
        public dlgEmpty(JFrame parent) 
          {
                
             super(parent,"Indicators", true);
             
             Container content = getContentPane();
             content.setLayout(new BorderLayout());
             
             butPan = Box.createHorizontalBox();
             
             JButton okBut = new JButton("OK");
             okBut.setActionCommand("ok"); 
             butPan.add(okBut, BorderLayout.SOUTH);    
        
             JButton CancelBut = new JButton("Cancel");
             CancelBut.setActionCommand("Cancel"); 
             butPan.add(CancelBut, BorderLayout.SOUTH);    
             content.add(butPan, BorderLayout.SOUTH);                    
             centerPan = Box.createVerticalBox();
              content.add(centerPan, BorderLayout.CENTER);

             pack();
             show();
          }
         boolean isOk=false;
          public void actionPerformed(ActionEvent e) 
          {
              if ("OK".equals(e.getActionCommand()))
                  isOk=true;          
              setVisible(false);
            }  
}

Answer 1

您正在将操作命令设置为：

okBut.setActionCommand("ok"); 

但我们正在检查：

if ("OK".equals(e.getActionCommand()))

这不匹配，因为情况不同

Answer 2

setActionCommand仅在ActionEvent中设置消息。您需要的是addActionListener。我已经更新了你的代码

但是你应该知道的另一件事是没有必要这样做。而是使用JOptionPane。以JComponent作为消息参数的showConfirmDialog：它自动执行所有按钮处理和模式在线等待

    public dlgEmpty(JFrame parent) 
      {
            
         super(parent,"Indicators", true);
         
         Container content = getContentPane();
         content.setLayout(new BorderLayout());
         
         butPan = Box.createHorizontalBox();
         
         JButton okBut = new JButton("OK");
         okBut.setActionCommand("ok"); 
         okBut.addActionListener(this); // added this line
         butPan.add(okBut, BorderLayout.SOUTH);    
    
         JButton CancelBut = new JButton("Cancel");
         CancelBut.setActionCommand("Cancel");
         CancelBut.addActionListener(this); 
         butPan.add(CancelBut, BorderLayout.SOUTH); //added this line    
         content.add(butPan, BorderLayout.SOUTH);                    
         centerPan = Box.createVerticalBox();
          content.add(centerPan, BorderLayout.CENTER);

         pack();
         show();
      }
     boolean isOk=false;
      public void actionPerformed(ActionEvent e) 
      {
          if ("OK".equals(e.getActionCommand()))
              isOk=true;          
          setVisible(false);
        }  
}