basicbutton.java

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

class BasicButton implements ActionListener
{
  // 构造方法-------------------------------------------------------------------
  public BasicButton()
  {
    initComponent();
    win.show();
  }
  
  // 覆盖接口ActionListener的回调方法-------------------------------------------
  public void actionPerformed(ActionEvent e)
  {
    String cmd = e.getActionCommand();
    if(cmd.equals(BasicButton.CMD_OK))   // 确认
      JOptionPane.showMessageDialog(win,"你单击了按钮"+BasicButton.BTN_OK);
    if(cmd.equals(BasicButton.CMD_EXIT)) // 退出
      System.exit(0);
  }
  
  // 生成窗口的组件-------------------------------------------------------------
  private void initComponent()
  {
    win = new JFrame("事件处理例程");
    pane = win.getContentPane();
    pane.setLayout(new GridLayout());
    addButton(BTN_OK,CMD_OK);
    addButton(BTN_EXIT,CMD_EXIT);
    win.setSize(200,100);
  }
  // 在面板上添加按钮-----------------------------------------------------------
  private void addButton(String caption,String cmd)
  {
    JButton b = new JButton(caption);    // b为事件源
    b.setFont(new Font("宋体",Font.BOLD,24));
    b.setActionCommand(cmd);
    b.addActionListener(this);           // 将BasicButton类的对象作为监听器注册给b
    pane.add(b);
  }
  
  private JFrame win;
  private Container pane;
   
  public static final String BTN_OK = "确认";
  public static final String BTN_EXIT = "退出";
  public static final String CMD_OK = "OK";
  public static final String CMD_EXIT = "EXIT";
}

class tester
{
  public static void main(String[] args)
  {
    new BasicButton();
  }
}