textdisplay.java

来自「《JAVA与模式》附书中源代码」· Java 代码 · 共 41 行

package com.javapatterns.observer.mvc;

/*
* This example is from javareference.com
* for more information visit,
* http://www.javareference.com
*/

//import statements
import java.awt.*;
import java.util.*;

/**
* TextDisplay.java
* This class demonstrates the use of Observer Pattern
* This class represents the Text View Object and implements
* Observer interface
*
* @author Rahul Sapkal([e-mail])
*/
public class TextDisplay extends TextField implements Observer
{
    private String m_text;
    
    //Constructor
    public TextDisplay(String text)
    {
        super(text);
        
        m_text = text;
    }
    
    //update method called when notified by the Observable
    public void update(Observable o, Object arg)
    {
        setText(m_text + ((Data)o).getData());
    }
}