package pattern.command; /** * @author 刘壮飞 * https://github.com/zfman. * https://blog.csdn.net/lzhuangfei. */ public class Stock { public String name="aa"; public float quantity=4.0f; public void buy(){ System.out.println("buy::"+name+","+quantity); } public void sell(){ System.out.println("sell::"+name+","+quantity); } }