itsukyu.java

java模式之命令模式的一个具体应用

/**
 * 这个系统由一个视窗类Itsukyu、
 * 一个可撤消的文字框UndoableTextArea、
 * 抽象命令角色Command，
 * 以及具体命令角色UndoCommand和RedoCommand组成。
 * 
 * 
 * 本类为 ： 视窗类的源代码
 */



package itsukyu;

import java.awt.Frame;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
 
@SuppressWarnings("serial")
public class Itsukyu extends Frame
{
    /**
     * @link aggregation 
     */
    private static UndoableTextArea text ;
 
    /**
     * @link aggregation 
     */
    static ItsukyuQuotation panel;
 
     public Itsukyu(String title)
     {
        super(title);
    }
 
    public static void main(String[] s)
    {
        // create an undoable text area
        text = new UndoableTextArea("Your text here.");
 
        // Create app panel
        panel = new ItsukyuQuotation(text);
 
        // Create a frame for app
        Itsukyu frame = new Itsukyu("Itskyu talks on Zen");
 
        // Add a window listener for window close events
        frame.addWindowListener(new WindowAdapter()
        {
             public void windowClosing(WindowEvent e) { System.exit(0);} 
        } );
 
        // Add app panel to content pane
        frame.add(panel);
 
        // Set initial frame size and make visible
        frame.setSize (300, 300);
        frame.setVisible(true);
    } 
}