商品系统
package shangpin;import java.util.InputMismatchException;
import java.util.Scanner;
class OutNumException extends Exception
{
OutNumException(){
super("购买数量超出库存！");
}
}
class OutNumException2 extends Exception
{
OutNumException2(){
super("请输入正确的序号！");
}
}
class ShangPin{
String name; //商品名称
double price; //商品价格
int num; //库存量
ShangPin(){}
ShangPin(String name,double price,int num){
this.name = name;
this.num = num;
this.price=price;
}
void print() {
System.out.println("库存为：" + num +"名为：" + name+"价格为"+price);
}
}
class Food extends ShangPin{
String name;
int num,data;//保质期
double price;
Food(){}
Food(int num,int data,String name,double price) {
this.num = num;
this.name = name;
this.data = data;
this.price=price;
}
void print() {
System.out.println("库存为：" + num +" 商品名为：" + name+" 价格为"+price+" 保质期"+data+"天");
}
}
class Clothes extends ShangPin{
String name,size;
int num;//保质期
double price;
Clothes(){}
Clothes(int num,String name,String size,double price) {
this.num = num;
this.name = name;
this.size = size;
this.price=price;
}
void print() {
System.out.println("库存为：" + num +" 商品名为：" + name+" 价格为"+price+" 型号"+size);
}
}
public class ShangPing {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner sc = new Scanner(System.in);
ShangPin[] e = new ShangPin;
Clothes[] o = new Clothes;
Food[] f = new Food;
double money;
//服装
o=new Clothes(10, "T恤","S", 100);
o=new Clothes(13, "T恤","M", 110);
o=new Clothes(20, "T恤","L", 120);
//食物
f=new Food(30,30,"辣条",5.0);
f=new Food(5,3,"面包",4.5);
f=new Food(14,90,"泡面",4.4);
e=f;
e=f;
e=f;
e=o;
e=o;
e=o;
System.out.println("当前库存：\n");
for(int i=0;i<6;i++)
{
e.print();
}
while(true)
{
try {
System.out.println("请输入你要购买的商品：\n");
System.out.println("1.食物\t2.衣服\t3.我全都要\n");
int n=sc.nextInt();
if(n<1||n>3)
{
throw new OutNumException2();
}
switch(n) {
case 1:
System.out.println("1.辣条\t2.面包\t3.泡面\n");
System.out.println("请输入购买的数量：\n");
int a=sc.nextInt();
int b=sc.nextInt();
int c=sc.nextInt();
if(f.num<a||f.num<b||f.num<c)
{
throw new OutNumException();
}
f.num-=a;
f.num-=b;
f.num-=c;
money=f.price*a+f.price*b+f.price*c;
System.out.println("剩余库存：\n");
System.out.println("购买成功，应支付"+money+"元\n");
for(int i=0;i<6;i++)
{
e.print();
}
break;
case 2:
System.out.println("1.S\t2.M\t3.L\n");
System.out.println("请输入购买的数量：\n");
int a1=sc.nextInt();
int b1=sc.nextInt();
int c1=sc.nextInt();
if(o.num<a1||o.num<b1||o.num<c1)
{
throw new OutNumException();
}
o.num-=a1;
o.num-=b1;
o.num-=c1;
money=o.price*a1+o.price*b1+o.price*c1;
System.out.println("剩余库存：\n");
System.out.println("购买成功，应支付"+money+"元\n");
for(int i=0;i<6;i++)
{
e.print();
}
break;
case 3:
System.out.println("1.辣条\t2.面包\t3.泡面\t4.S\t5.M\t6.L\n");
System.out.println("请输入购买的数量：\n");
int a2=sc.nextInt();
int b2=sc.nextInt();
int c2=sc.nextInt();
int a3=sc.nextInt();
int b3=sc.nextInt();
int c3=sc.nextInt();
if(f.num<a2||f.num<b2||f.num<c2||o.num<a3||o.num<b3||o.num<c3)
{
throw new OutNumException();
}
f.num-=a2;
f.num-=b2;
f.num-=c2;
o.num-=a3;
o.num-=b3;
o.num-=c3;
money=f.price*a2+f.price*b2+f.price*c2+o.price*a3+o.price*b3+o.price*c3;
System.out.println("剩余库存：\n");
System.out.println("购买成功，应支付"+money+"元\n");
for(int i=0;i<6;i++)
{
e.print();
}
break;
}
break;
}
catch (InputMismatchException e1) {
System.out.println("输入类型错误");
sc.next();
}
catch(OutNumException e1)
{
System.out.println(e1.getMessage());
} catch (OutNumException2 e1) {
// TODO Auto-generated catch block
System.out.println(e1.getMessage());
}
}
}
} 建议代码分模块重构一下
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