Listing 6. The StockQuotes class—the client application: 
public class StockQuotes
	{
	public static void main(String[] args)
		{
		System.out.println();
		System.out.println("-- Stock Quote Application --");
		System.out.println();

		StockData stockData = new StockData();

		// register observers...
		new TradingFool(stockData);
		new BigBuyer(stockData);

		// generate changes to stock data...
		stockData.setStockData("JUPM",16.10f,16.15f,15.34f,(long)481172);
		stockData.setStockData("SUNW",4.84f,4.90f,4.79f,(long)68870233);
		stockData.setStockData("MSFT",23.17f,23.37f,23.05f,(long)75091400);
		}
	}

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