java常见事件响应方法实例汇总(2)

import java.awt.BorderLayout; 
import java.awt.event.ActionEvent; 
import javax.swing.*; 
 
class ViewAction extends AbstractAction{ 
  private String ActionName=""; 
  //private JFrame frame=null; 
  private Action action=null; 
  public ViewAction(){ 
  } 
  public ViewAction(String ActionName){ 
    this.ActionName=ActionName; 
    //this.frame=frame; 
  } 
  @Override 
  public void actionPerformed(ActionEvent e) { 
    Action action=getAction(this.ActionName); 
    action.execute(); 
  } 
  private Action getAction(String ActionName){ 
    try{ 
      if (this.action==null){ 
        Action action=(Action)Class.forName(ActionName).newInstance(); 
        this.action=action; 
      } 
      return this.action; 
    }catch(Exception e){ 
    return null; 
    } 
  } 
} 
public class TestAE extends JFrame { 
  public JToolBar bar=new JToolBar(); 
  String buttonName[]={"b1","b2","b3"}; 
  public TestAE(){ 
    super("事件"); 
    for (int i=0;i<buttonName.length;i++){ 
      ViewAction action=new ViewAction(buttonName[i]); 
      JButton button=new JButton(buttonName[i]); 
      button.addActionListener(action); 
      bar.add(button); 
    } 
    this.getContentPane().add(bar,BorderLayout.NORTH); 
    this.setSize(300, 200); 
    this.setLocationRelativeTo(null); 
    this.setVisible(true); 
  } 
  public static void main(String [] args){ 
    new TestAE(); 
  } 
} 
interface Action{ 
  void execute(); 
} 
class b1 implements Action{ 
  public void execute(){ 
    JOptionPane.showMessageDialog(null, "单击了 b1"); 
  } 
} 
class b2 implements Action{ 
  public void execute(){ 
    JOptionPane.showMessageDialog(null, "单击了 b2"); 
  } 
} 
class b3 implements Action{ 
  public void execute(){ 
    JOptionPane.showMessageDialog(null, "单击了 b3"); 
  } 
}