代码：

class MobileShop { InnerPurchaseMoney purchaseMoney1;
    InnerPurchaseMoney purchaseMoney2;private int mobileAmount;//手机的数量MobileShop(){purchaseMoney1=new InnerPurchaseMoney(20000);
        purchaseMoney2=new InnerPurchaseMoney(10000);
    }void setMobileAmount(int m){mobileAmount=m;}int getMobileAmount(){return mobileAmount;}class InnerPurchaseMoney {int moneyValue;InnerPurchaseMoney(int m){moneyValue = m;}void buyMobile(){if(moneyValue>=20000){mobileAmount = mobileAmount-6;System.out.println("用价值"+moneyValue+"的内部购物券买了6部手机");}else if(moneyValue<20000&&moneyValue>=10000){mobileAmount = mobileAmount-3;System.out.println("用价值"+moneyValue+"的内部购物券买了3部手机");}}}
}
public class MainClass
{public static void main(String arg[]){MobileShop shop = new MobileShop();shop.setMobileAmount(30);System.out.println("手机专卖店目前有"+shop.getMobileAmount()+"部手机");shop.purchaseMoney1.buyMobile();shop.purchaseMoney2.buyMobile();System.out.println("手机专卖店目前有"+shop.getMobileAmount()+"部手机");}
}