Now we’ll create the definitions for the StockPricer and StockWatcher services. First we’ll define the listener service:
public class StockWatcher implements StockListener {
public StockWatcher () {
}
public void stockPriceUpdated (StockEvent ev) {
System.out.println ("Stock " + ev.getSymbol () +
" is at price " + ev.getPrice ());
}
}Not much is needed here. Like all services, this requires a public constructor with no arguments. Aside from that, it implements StockListener by printing the current stock price.
