boxobservable.java

来自「《JAVA与模式》附书中源代码」· Java 代码 · 共 18 行

package com.javapatterns.observer.monkeyking;

import java.awt.*;
import java.awt.event.*;
import java.util.*;

// You must inherit a new type of Observable:
class BoxObservable extends Observable
{
	public void notifyObservers(Object b)
	{
		// Otherwise it won't propagate changes:
		setChanged();
		super.notifyObservers(b);
	}
}