import java.util.Scanner;
public class 管理员 {
String name;
String oldpsw;
String newpsw;
String repsw;
Scanner input=new Scanner(System.in);
public void Change(){
System.out.println("请输入用户名：");
String inputname=input.next();
System.out.println("请输入密码：");
String inputpsw=input.next();
if(inputname.equals(name)&&inputpsw.equals(oldpsw)){
System.out.println("请输入新密码");
newpsw=input.next();
System.out.println("请再次输入密码");
repsw=input.next();
if(newpsw.equals(repsw)){
System.out.println("密码修改成功！");
oldpsw=newpsw;
}
while(!(newpsw.equals(repsw))){
System.out.println("密码输入错误，请重新输入！");
System.out.println("请输入您的新密码：");
newpsw=input.next();
System.out.println("请再次输入新密码");
repsw=input.next();
}
System.out.println("密码修改成功！");
}
else{
System.out.println("您的账号密码输入有误，请重新输入！");
}
}
public void show(){
System.out.println("名称"+"\t\t价格");
System.out.println("可乐330ml"+"\t3元");
System.out.println("雪碧330ml"+"\t3元");
System.out.println("电饭锅"+"\t\t300元");
}
public void pay(){
String name = "";
double price = 0.0;
int goodsNo = 0;
int amount = 0;
double discount = 0.8;
double total = 0.0;
double payment = 0.0;
System.out.println("*******************************************");
System.out.println("请选择购买的商品编号：");
System.out.println("1.可乐 2.雪碧 3.电饭锅");
System.out.println("*******************************************");
String answer = "y";
while("y".equals(answer)){
System.out.print("\n请输入商品编号：");
goodsNo = input.nextInt();
switch(goodsNo){
case 1:
name = "可乐";
price = 3;
break;
case 2:
name = "雪碧";
price = 3;
break;
case 3:
name = "电饭锅";
price = 300;
break;
}
System.out.print("请输入购买数量：");
amount = input.nextInt();
System.out.println(name+ "￥" + price +"\t数量 " + amount
+ "\t合计 ￥" + price*amount);
total += price*amount;
System.out.print("是否继续（y/n）");
answer = input.next();
}
System.out.println("\n折扣：" + discount);
System.out.println("应付金额：" +total*discount);
System.out.print("实付金额：");
payment = input.nextDouble();
while(payment - total*discount < 0){
System.out.print("您输入的金额小于应付金额，请重新输入：");
payment = input.nextDouble();
}
System.out.println("找钱：" + (payment - total*discount));
}
public void xingyun(){
int random = (int) (Math.random() * 10);
System.out.println("我行我素购物管理系统 > 幸运抽奖\n");
System.out.print("请输入4位会员号： ");
int custNo = input.nextInt();
int baiwei = custNo / 100 % 10;
if (baiwei == random) {
System.out.println(custNo + "是幸运客户，获精美Mp3一个。");
} else {
System.out.println(custNo + " 谢谢您的支持！");
}
}
public void huangou(){
System.out.print("请输入消费金额：");
double money = input.nextDouble();
double extra = 0;
int choice = 0;
if(money>=50){
System.out.println("是否参加优惠换购活动：");
System.out.println("1：满50元，加2元换购百事可乐饮料1瓶");
System.out.println("2：满100元，加3元换购500ml可乐一瓶");
System.out.println("3：满100元，加10元换购5公斤面粉");
System.out.println("4：满200元，加10元可换购1个苏泊尔炒菜锅");
System.out.println("5：满200元，加20元可换购欧莱雅爽肤水一瓶");
System.out.println("0：不换购");
System.out.print("请选择：");
if(input.hasNextInt()==true){
choice = input.nextInt();
switch(choice){
case 1:
if(money>=50){
extra = 2;
}
break;
case 2:
if(money>=100){
extra = 3;
}
break;
case 3:
if(money>=100){
extra = 10;
}
break;
case 4:
if(money>=200){
extra = 10;
}
break;
case 5:
if(money>200){
extra = 20;
}
break;
default:
break;
}
}else{
System.out.println("请输入正确的数字！");
}
}
double total = money + extra;
System.out.println("本次消费总金额："+ total);
if(choice == 1){
System.out.println("成功换购：" + "百事可乐饮料1瓶。");
}else if(choice ==2 ){
System.out.println("成功换购：" + "500ml可乐一瓶。");
}else if(choice == 3){
System.out.println("成功换购：" + "5公斤面粉。");
}else if(choice == 4){
System.out.println("成功换购：" + "1个苏泊尔炒菜锅。");
}else if(choice == 5){
System.out.println("成功换购：" + "欧莱雅爽肤水一瓶。");
}else {
System.out.println("无换购项目！");
}
}
}
import java.util.Scanner;
public class 主体 {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
管理员 XG=new 管理员();
Scanner input=new Scanner(System.in);
String account="TOM";
String pwd="123";
System.out.println("请选择！");
System.out.println("1.登录我行我素管理系统");
System.out.println("2.修改管理员密码");
int KS=input.nextInt();
switch(KS){
case 1:System.out.println("请输入您的账号");
String A=input.next();
System.out.println("请输入您的密码");
String B=input.next();
if(account.equals(A)&&pwd.equals(B)){
System.out.println("登录成功！");
System.out.println("欢迎进入我行我素~~");
System.out.println("***************************");
System.out.println("请选择您的选项");
System.out.println("****************************");
System.out.println("1.查询商品价格");
System.out.println("2.购物结算计算");
System.out.println("3.幸运抽奖");
System.out.println("4.商品换购");
int F=input.nextInt();
switch(F){
case 1:
XG.show();
break;
case 2:
XG.pay();
break;
case 3:
XG.xingyun();
break;
case 4:
XG.huangou();
}
}
else{
System.out.println("账号密码错误，请重新输入！");
}
break;
case 2:
XG.name="TOM";
XG.oldpsw="123";
XG.Change();
break;
}
}
}
网站标题：用java写我行我素购物系统
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