dbmenu.java

说明： 1、这是一个让人眼前一亮的设计

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

public class DBMenu extends JMenu
{
	JMenuItem dbItem;
	JMenuItem newItem;
	JMenuItem openItem;
	JMenuItem exitItem;
	
	ActionListener menuListener=null;
	MenuItemListener itemListener=new MenuItemListener();
	public DBMenu() 
	{	
	}
	public void enableMenuItem(String itemName,boolean enable)
	{
		Component c[]=this.getMenuComponents();
		for(int i=0;i<c.length;i++)
		{
			if(c[i] instanceof JMenuItem)
			{
				JMenuItem menuItem=(JMenuItem)c[i];
				if(menuItem.getText().equals(itemName))
					menuItem.setEnabled(enable);
			}
		}
	}
	public void setMenuListener(ActionListener menuListener)
	{
		this.menuListener=menuListener;
	}	
	class MenuItemListener implements ActionListener
    {
    	public void actionPerformed(ActionEvent event)
    	{
    		String action=event.getActionCommand();
    		if(menuListener!=null)
    		menuListener.actionPerformed(event); 
    	}
    }
}