//Example类文件Example.java
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package cn.zhouhan;
import java.util.Scanner;
public class Example {
static Drink cola, fanta, blacktea, greentea;
static int money;
public static void main(String[] args) {
// TODO Auto-generated method stub
cola = new Drink("可乐", 50, 2.0, 1);
fanta = new Drink("芬达", 40, 3.0, 2);
blacktea = new Drink("红茶", 30, 4.0, 3);
greentea = new Drink("绿茶", 20, 5.0, 4);
money = 500;
for()
{
System.out.println("-------------自动售货机-------------");
cola.UserPrintDrinkInfo();
fanta.UserPrintDrinkInfo();
blacktea.UserPrintDrinkInfo();
greentea.UserPrintDrinkInfo();
System.out.println("----------------------------------");
System.out.println("1.购买饮料");
System.out.println("2.管理员查询");
System.out.println("3.返回");
System.out.println("请输入要执行的操作序号：");
Scanner scannerIndex = new Scanner(System.in);
int indexScanner = scannerIndex.nextInt();
switch(indexScanner)
{
case 1:
System.out.println("请选择购买的饮料（1.可乐，2.芬达，3红茶，4.绿茶）：");
Scanner numberScanner = new Scanner(System.in);
int buyIndex = numberScanner.nextInt();
Drink drink = getDrink(buyIndex);
System.out.println("请输入购买的数量：");
Scanner countScanner = new Scanner(System.in);
int buyCount = countScanner.nextInt();
if (buyCount 0)
{
System.out.println("您选择了" + buyCount + "瓶" + drink.getName() + "." );
System.out.println("总价格：" + drink.getPrice() * buyCount + "元，请投入1元或5元纸币。");
System.out.println("确定购买？（1.确定，2.退款）：");
Scanner sureScanner = new Scanner(System.in);
int sure = sureScanner.nextInt();
if (sure == 1)
{
drink.sellDrink(buyCount);
money += drink.getPrice() * buyCount;
System.out.println("您购买了" + buyCount + "瓶" + drink.getName() + "，交易成功." );
}
if (sure ==2 )
{
System.out.println("退款成功！");
}
}
else
System.out.println("输入的数量有误！");
break;
case 2:
System.out.println("请输入管理员密码：");
Scanner pwScanner = new Scanner(System.in);
int password = pwScanner.nextInt();
if (password == 123)
{
System.out.println("密码正确，目前的余额为：" + money + "元。");
}
else
System.out.println("密码错误。");
break;
case 3:
break;
default:
System.out.println("请输入正确的数字。");
break;
}
}
}
public static Drink getDrink(int drinkIndex)
{
Drink drink = null;
switch(drinkIndex)
{
case 1:
drink = cola;
System.out.println("您选择了可乐。");
break;
case 2:
drink = fanta;
System.out.println("您选择了芬达。");
break;
case 3:
drink = blacktea;
System.out.println("您选择了红茶。");
break;
case 4:
drink = greentea;
System.out.println("您选择了绿茶。");
break;
default:
//drink = null;
System.out.println("输入错误，请输入1~4的数字！");
}
return drink;
}
}
//创建的Drink类文件Drink.java
package cn.zhouhan;
public class Drink {
private String name;
private int number;
private double price;
private double drinkMoney;
private int index;
public Drink(String name, int number, double price, int index)
{
this.name = name;
this.number = number;
this.price = price;
this.drinkMoney = number * price;
this.index = index;
}
public String getName()
{
return this.name;
}
public int getNumber()
{
return this.number;
}
public double getPrice()
{
return this.price;
}
public void sellDrink(int count)
{
this.number -= count;
this.drinkMoney += this.price * count;
}
public void UserPrintDrinkInfo()
{
System.out.println("品名："+ this.name +"，单价：" + this.price + "元，剩余数量：" + this.number + "瓶。");
}
}
就是专门写一个类，他有一个方法根据传入的参数不同，返回不同的对象。
比如有一台自动售货机AutoSeller， 然后它卖很多饮料Drink, 有茶Tea， 有可乐Cola, 当你去买的时候，你可能是通过按不同的按钮，但对AutoSeller的实现来说，他可能都是同样的方法，只是根据不同的参数（按钮），返回给你不同的对象（Tea或Cola）。
public interface Drink {
enum Type {TEA, COLA};
}
public Tea implements Drink {
}
public Cola implements Drink {
}
public class AutoSeller {//工厂
public static Drink getDrink(Drink.Type type) {
switch(type) {
case TEA:
return new Tea();
case COLA:
return new Cola();
default:break;
}
}
}
如上， 在你选择饮料按下按钮里， 自动售货机的代码可能只要执行AutoSeller.getDrink(type)就可以返回你想要的饮料了。
之所以要把Drink定义成接口，一般来讲，用这种架构的话， Drink里面会声明一些接口方法， 这些方法是Tea和Cola都需要的， 但Drink不用关心方法的具体实现， 具体实现只要由Tea和Cola去完成。
而你通过AutoSeller.getDrink(type)去拿到一个Drink对象后，可以用这个对象直接去调Drink中声明的方法。
package com.test;
import java.util.Scanner;
import com.sun.java_cup.internal.internal_error;
public class Demo {
/**
* @param args
*/
public static void main(String[] args) {
Scanner s=new Scanner(System.in);
int c;
int gum=0,cho=0,pop=0,jui=0;
do{
Demo.play_bord();
c=s.nextInt();
if(c0||c6){
System.out.println("1-6 only ,input a new choice");
c=s.nextInt();
}
switch(c){
case 1:
System.out.println("here is your gum");
gum++;
break;
case 2:
System.out.println("here is your chocolate");
cho++;
break;
case 3:
System.out.println("here is your popcorn");
pop++;
break;
case 4:
System.out.println("here is your juice");
jui++;
break;
case 5:
System.out.println(gum+" gum are sold");
System.out.println(cho+" chocolate are sold");
System.out.println(pop+" popcorn are sold");
System.out.println(gum+" juice are sold");
break;
case 6:
System.out.println("system exit");
}
}while(c!=6);
}
public static void play_bord(){
System.out.println("****这是简易售货机，请按下数字选择服务*****");
System.out.println("[1]:get gum");
System.out.println("[2]:get chocolate");
System.out.println("[3]:get popcorn");
System.out.println("[4]:get juice");
System.out.println("[5]:dispaly totalsold");
System.out.println("[6]:quit");
System.out.println("***************************");
}
}
刚好以前写了个 改完给你了