比如我想用“Enter”回车键来确定“确定”按钮，
“e”键来确定“取消”按钮
请问该如何处理？最好给出一些代码……

jButton.setMnemonic(KeyEvent.VK_ENTER);试试看

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;



public class AuthenDlg extends JDialog implements ActionListener
{
    JPanel panel1 = new JPanel();
    JLabel jLabel1 = new JLabel();
    JButton jButton1 = new JButton();
    JButton jButton2 = new JButton();
    JPasswordField jPasswordField1 = new JPasswordField(10);

    public AuthenDlg(JFrame frame, String title, boolean modal) {
        super(frame, title, modal);
        try {
            jbInit();
            setSize(400,170);
            setLocation(300,200);
        }
        catch(Exception ex) {
            ex.printStackTrace();
        }
    }




    public AuthenDlg() {
        this(null, "key_test", false);
    }
    void jbInit() throws Exception {
        panel1.setLayout(null);

        usrName = null;
        jLabel1.setText("PASSWORD");
        jLabel1.setBounds(new Rectangle(73, 40,70,20));
        jButton1.setText("OK");
        jButton1.setBounds(new Rectangle(102, 91,85,25));
        jButton1.addActionListener(this);
        jButton1.addKeyListener(new java.awt.event.KeyListener() {
            public void keyPressed(KeyEvent e)
            {
                key_press_event(e);
            }

            public void keyTyped(KeyEvent e) {}

            public void keyReleased(KeyEvent e) {}

           }
        );
        jButton2.setText("CANCEL");
        jButton2.setBounds(new Rectangle(199, 91,85,25));
        jButton2.addActionListener(this);
        jButton2.addKeyListener(new java.awt.event.KeyListener() {
            public void keyPressed(KeyEvent e)
            {
                key_press_event(e);
            }

            public void keyTyped(KeyEvent e) {}

            public void keyReleased(KeyEvent e) {}

           }
        );
        getContentPane().add(panel1);
        jPasswordField1.setBounds(new Rectangle(171, 40,140,20));
        jPasswordField1.addKeyListener(new java.awt.event.KeyListener() {
            public void keyPressed(KeyEvent e)
            {
                key_press_event(e);
            }

            public void keyTyped(KeyEvent e) {}

            public void keyReleased(KeyEvent e) {}

           }
        );
        panel1.add(jButton1, null);
        panel1.add(jButton2, null);
        panel1.add(jLabel1, null);
        panel1.add(jPasswordField1,null);
        

        this.addWindowListener(new MyWindowListener());
        this.setDefaultCloseOperation(WindowConstants.DO_NOTHING_ON_CLOSE);
    }

    public static void main(String args[]){
        AuthenDlg lock = new AuthenDlg();
        lock.show();
    }

   
    public void actionPerformed(ActionEvent e)
    {
        if(e.getSource() == jButton1)
        {
           jButton1_actionPerformed();
        }

        if(e.getSource() == jButton2)
        {
            cancelAct();
        }
    }

    void jButton1_actionPerformed()
    {
        System.out.println("this is ok");        
    }

    void key_press_event(KeyEvent e)
    {
        if (e.getKeyCode()==KeyEvent.VK_ENTER )
            jButton1_actionPerformed();
        
        if (e.getKeyCode()==KeyEvent.VK_E)
            cancelAct();
    }
    
    void cancelAct()
    {
System.out.println("this is cancel");
this.hide();
}

  
class MyWindowListener extends WindowAdapter
{
public void windowClosing(WindowEvent e)
    {
        cancelAct();
}

}

}

当button有焦点时, 按空格将激发action事件

jButton.setMnemonic(KeyEvent.VK_ENTER);是肯定可以的，不过就是“Alt＋Enter”。其它的我也不知道啊，是不是有类似的KeyEvent.？可以选择成只要回车就可以？

你要想用Enter直接响应，最好的办法是将每个组件都加键盘的响应事件，然后，执行你要的方法
例如：
class Key_Listener implements KeyListener
{
            public void keyPressed(KeyEvent e)
            {
                key_press_event(e);
            }

            public void keyTyped(KeyEvent e) {}

            public void keyReleased(KeyEvent e) {}

            void key_press_event(KeyEvent e)
             {
                if (e.getKeyCode()==KeyEvent.VK_ENTER )
                     System.out.println("enter");
        
                 if (e.getKeyCode()==KeyEvent.VK_E)
                    System.out.println("e");
              }            

}


在你的程序中,每个组件都加响应事件
Key_Listener keyL = new Key_Listener();

........
jButton1.addKeyListener(keyL) ;
jButton2.addKeyListener(keyL) ;
........

监视按键事件咯. . .当有回车按下的时候,发送一个action事件给这个按钮

to drinkant(喝酒的蚂蚁):
天哪！如果是这样的话，那岂不是我在其他想回车的地方都不能回撤了？呵呵！

你可以试试registerKeyboardAction，下面是它的api文档。
public void registerKeyboardAction(ActionListener anAction,
                                   KeyStroke aKeyStroke,
                                   int aCondition)This method is now obsolete, please use a combination of getActionMap() and getInputMap() for similiar behavior.

1。jButton.setMnemonic(KeyEvent.VK_ENTER);这是一种较简单的，要按alt＋enter。

首先引入包
import javax.swing.event.*;
然后定义一个
    KeyStroke stroke1 = KeyStroke.getKeyStroke     (KeyEvent.VK_ENTER,ActionEvent.CTRL_MASK,true);//创建一个KeyStroke类
    最后一个参数的意思是是否在Keyrelease时触发此事件
    JButton jButton1 = new JButton();

   jButton1.registerKeyboardAction(new ActionListener(){
            //要执行的方法
            public void actionPerformed(ActionEvent e){
                System.out.println("OK");
            }
        },stroke1,JComponent.WHEN_IN_FOCUSED_WINDOW);
    }
    registerKeyboardAction方法的参数意思是这样的
    1.ActionListener对象,可以定义你要执行的方法
    2.KeyStroke 对象,定义触发事件的条件
    3.何时按Ctrl+Enter时发生此事件,比如
        JComponent.WHEN_IN_FOCUSED_WINDOW
        JComponent.WHEN_FOCUSED等