内部类与异常类：实验1

class DangerException extends Exception{String s;DangerException(String s){this.s=s;}public void warnMess() {System.out.println(s);}}class MobileShop{int phones;double phone;InnerPurchaseMoney a,b;MobileShop(double phone, int phones){this.phones = phones;this.phone = phone;this.a = new InnerPurchaseMoney(20000);this.b = new InnerPurchaseMoney(10000);}public int get_phone() {return phones;}public void set_phone(int phones) {this.phones = phones;}class InnerPurchaseMoney{double purchaseMoney,s;InnerPurchaseMoney(double purchaseMoney){s = this.purchaseMoney = purchaseMoney;}public void use_purchase(int phones) throws DangerException{if(phones > MobileShop.this.phones   ||MobileShop.this.phones <= 0) {throw new DangerException("手机库存不足");}purchaseMoney-=phones*MobileShop.this.phone;if(purchaseMoney < 0) {throw new DangerException("余额不足");}MobileShop.this.phones-=phones;System.out.println("用价值"+s+"元的内部购物券购买了"+phones+"部手机");}}}public class test_main {public static void main(String[] args) {// TODO 自动生成的方法存根MobileShop a = new MobileShop(3333,30);System.out.println("手机专卖店目前有"+a.get_phone()+"部手机");try {a.a.use_purchase(6);a.b.use_purchase(3);}catch(DangerException e){e.warnMess();}finally {System.out.println("手机专卖店目前有"+a.get_phone()+"部手机");}}}