一个JFrame，点击Open按钮，打开一个对话框，对话中点击某一个按钮后关闭该对话框，如何在Frame里面知道点击了对话框中的哪个按钮？

在JFrame里面扩展此dialog类，覆盖其按钮方法即可
比如：我更新数据，弹出“是否确定更新”对话框，dialog如下：
package omt;
import javax.swing.*;
import java.awt.*;
import com.borland.jbcl.layout.*;
import javax.swing.border.*;
import java.awt.event.*;
/**
 * 作者：alphazhao
 * 日期：2002-5-29
 * 描述：确定修改时，弹出此确定窗口
 * */

public class ShowUpdateMsg extends JDialog {
  private TitledBorder titledBorder1;
  private String strMsg;
private Font font14 = new Font("Dialog", 0, 14);
  private JPanel jPanel1 = new JPanel();
  private XYLayout xYLayout1 = new XYLayout();
  private JLabel jLabel1 = new JLabel();
  private JButton jButton1 = new JButton();
  private JButton jButton2 = new JButton();

//  public ShowUpdateMsg(Frame owner, boolean modal) {
  public ShowUpdateMsg(Dialog owner, boolean modal) {
    super(owner,modal);
    try {
      this.setTitle("系统提示");
      this.setResizable(false);
//      this.setBackground(color);
      //NewLineMsg nlm = new NewLineMsg();
      //strMsg = nlm.newLineMsgWay(msg);//组织换行处理

      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }
  private void jbInit() throws Exception {
    jPanel1.setLayout(xYLayout1);
    jLabel1.setFont(font14);
//    jLabel1.setForeground(colorTxt);
    jLabel1.setText("是否确定要修改此条记录？");

//    jButton1.setBackground(color);
    jButton1.setFont(font14);
    //jButton1.setBorder(BorderFactory.createEtchedBorder());
    jButton1.setText("确  定");
    /*//
    jButton1.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        jButton1_actionPerformed(e);
      }
    });
    //*/

//    jButton2.setBackground(color);
    jButton2.setFont(font14);
    //jButton2.setBorder(BorderFactory.createEtchedBorder());
    jButton2.setText("取  消");
    /*//
    jButton2.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        jButton2_actionPerformed(e);
      }
    });
    //*/
    this.setSize(350,130);
//    jPanel1.setBackground(color);

    this.getContentPane().add(jPanel1, BorderLayout.CENTER);
    jPanel1.add(jLabel1,    new XYConstraints(94, 22, 221, 35));
    jPanel1.add(jButton1, new XYConstraints(91, 65, 75, 25));
    jPanel1.add(jButton2, new XYConstraints(180, 65, 75, 25));

    //Center the window
    CenterShowDialog csf = new CenterShowDialog(this);

    ///
    SymListener symListener = new SymListener();
    jButton1.addActionListener(symListener);
    jButton2.addActionListener(symListener);
    //设置快捷键
    jButton1.registerKeyboardAction(symListener,
      KeyStroke.getKeyStroke(KeyEvent.VK_ENTER, 0),
        JComponent.WHEN_IN_FOCUSED_WINDOW);
    //确定按钮为回车键"ENTER"
    jButton2.registerKeyboardAction(symListener,
      KeyStroke.getKeyStroke(KeyEvent.VK_ESCAPE, 0),
        JComponent.WHEN_IN_FOCUSED_WINDOW);
    //取消按钮为退出键"Escape"
    //*/
  }

  void jButton1_actionPerformed(ActionEvent e) {
    //调用时此方法须重写
    //this.dispose();
  }
  void jButton2_actionPerformed(ActionEvent e) {
    this.dispose();
  }

  ///设置快捷键
  class SymListener implements ActionListener {
    public void actionPerformed(ActionEvent e) {
      Object obj = e.getSource();
      if (obj == jButton1) {
        jButton1_actionPerformed(e);
      }
      else if (obj == jButton2) {
        jButton2_actionPerformed(e);
      }
    }
  }
  //*/
}