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");
		}
	}

}