currentpricedisplay.java

基于股票价格变化的观察者模式的java源代码。初学者可看

public class CurrentPriceDisplay implements Observer,
  DisplayElement{
	private float price;
	private Stock stockData;
	public CurrentPriceDisplay(Stock stockData){
		this.stockData = stockData;
		stockData.registerObserver(this);
	}
	public void update(float price){
		this.price = price;
		display();
	}
	public void display(){
		System.out.println("当前股票价格为:"+price);
	}
}