professional.java

java与模式 一书的源码

package com.javapatterns.composite.containers;

import java.applet.Applet;
import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.Panel;
import java.awt.Label;
import java.awt.TextField;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.Component;

public class Professional extends Applet
{
    TextField txtMessage = new TextField("Bad people",35);

    public void init()
    {
		Panel center = new Panel();
		MyPanel myPanel = new MyPanel(center);
		
		myPanel.addButton("Politician", "Take money from the rich, votes from the poor.");
		myPanel.addButton("Programmer", "Sell bugs, charge for fixes.");
		
		center.add(new Label("Important Message:"));
		center.add(txtMessage);
		
		setLayout(new BorderLayout());
		add(myPanel);
   }

    public class MyEventHandler implements ActionListener
    {
		String message = null;

        public MyEventHandler(String message)
        {
        	this.message = message;
        }

		public void actionPerformed(ActionEvent event)
		{
		  txtMessage.setText(message);
		} 
    };


    public class MyPanel extends Panel
    {
		private Panel buttonPanel = new Panel();
		
		public MyPanel(Panel centerPanel)
		{
			setLayout(new BorderLayout());
			add(centerPanel, "Center");
			add(buttonPanel, "South");
		}
		public void addButton(String label, String message)
		{
			Button btnNewButton = new Button(label);
			buttonPanel.add(btnNewButton);
			btnNewButton.addActionListener(new MyEventHandler(message));
		}
    };
}