Java实现购物管理系统

JAVA分支结构练习
动态数组
注册表读写删

代码：

package Endless;
import java.util.ArrayList;
import java.util.Random;
/**
* @JAVA01.person1.java
* @author 当前用户：Endless作者 :Endless
* @version 创建时间：2017年7月26日 下午6:29:16
* //实现商品及会员信息管理(添加，删除，显示)
* //实现超市结算
*/
import java.util.Scanner;
import java.util.prefs.BackingStoreException;
import java.util.prefs.Preferences;
public class persion {
static int s;
static boolean huiyuan,xhuiyuan;
static String bke="百事可乐",ke="500ml可乐一瓶",m="5公斤面粉",ss="1个苏泊尔炒菜锅",o="欧莱雅爽肤水一瓶";
static ArrayList<String>array=new ArrayList<String>();
static Preferences goodsnodes = Preferences.systemRoot().node("goods"); //创建节点
static Preferences goodschildnode = goodsnodes.node( "goods");  //创建子节点
public static void main(String []args) {
outline();
System.out.println("\t欢迎使用购物管理系统");
System.out.println("\t1.登陆系统\n\t2.退出程序\n ");
outline();
int n =scanint();
if(n == 1){
login();
}else if( n== 2){
System.out.println("已退出");
System.exit(0);
}else {
System.out.println("请重新选择：");
main(null);
}
}
public static void outline(){
System.out.println("* * * * * * * * * * * * * * * * * * * * * * *\n");
}
public static int scanint(){
int x = 0;
try {
Scanner scan =new Scanner(System.in);
x = scan.nextInt();
} catch (Exception e) {
System.out.println("输入有误,请输入数字：");
}
return x;
}
public static String scanStr(){
String x = null;
try {
Scanner scan =new Scanner(System.in);
x = scan.next();
} catch (Exception e) {
System.out.println("输入有误,请输入字符串：");
}
return x;
}
public static void login(){
System.out.println(" * * * * * * * * * 登陆 * * * * * * * * * * * *\n请输入密码\n：");
int n1 =scanint();
if(n1==(123123)){
System.out.println("登陆成功\n");
showMain();
}else{
System.out.println("密码错误");
System.out.println("请重新输入密码\n：");
login();
}
}
private static void showMain() {
System.out.println("\n\n\t欢迎使用购物管理系统\n");
outline();
System.out.println("\t\t 1. 会 员 信 息 管 理\n");
System.out.println("\t\t 2. 货 物 信 息 管 理\n");
System.out.println("\t\t 3. 购 物 结 算\n");
System.out.println("\t\t 4. 注 销\n");
outline();
System.out.print("请选择,输入数字:");
int n2 =scanint();
switch (n2) {
case 1:
new user();
break;
case 2:
goods();
break;
case 3:
jiesuan();
break;
case 4:
System.out.println("注销成功");
main(null);
default:
System.out.println("没有您要的选项请重新输入");
showMain();
break;
}
}
private static void goods() {
//商品管理 ：添加商品： 编号 品名 价格
// 删除：选择标号删除
outline();
System.out.println("\t\t商品信息管理\n");
System.out.println("\t\t1,显示商品\n");
System.out.println("\t\t2,添加物品\n");
System.out.println("\t\t3,删除商品\n");
System.out.println("\t\t4,返回上级\n");
outline();
int n = scanint();
if (n==1){
showgoods();
}else if(n==2){
addgoods();
}else if(n ==3){
delgoods();
}else if(n==4) {
showMain();
}else {
goods();
}
}
private static void delgoods() {
System.out.println("请选择要删除商品的ID：\n按0返回上级");
try {
Scanner scan =new Scanner(System.in);
int x = scan.nextInt();
boolean remove=false;
for (int i=0;i<array.size();i++){
if(x==Integer.parseInt(array.get(i))){
remove=true;
}
}
if (remove){
goodschildnode.remove(Integer.toString(x));
System.out.println("删除成功");
goods();
}else if (x==0) {
goods();
}else {
System.out.println("没有此商品！");
delgoods();
}
new user();
} catch (Exception e) {
System.out.println("请输入数字");
delgoods();
}
}
private static void showgoods() {
try {
int leng =goodschildnode.keys().length;
syncread();
if(leng==0){
System.out.println("没有商品");
}else{
try {
System.out.println("当前有"+goodschildnode.keys().length+"种商品");
for(int i = 0;i<=goodschildnode.keys().length;i++){
String shows =goodschildnode.get(array.get(i), "");
System.out.println(shows);
System.out.println("──────────────────────────────────────────────");
}
System.out.println("00000000");
} catch (Exception e) {
}
}
} catch (BackingStoreException e) {
}
System.out.println("111111111");
goods();
}
private static void syncread() {
try {
String[] arr= goodschildnode.keys();
goodschildnode.sync();
array.clear();
for(int i=0;i<arr.length;i++){
array.add(arr[i]);
}
} catch (Exception e) {
}
}
private static int check(int x) {
Random n=new Random();
syncread();
for(int i=0;i<array.size();i++){
if(x==Integer.parseInt(array.get(i))){
check(n.nextInt(999)+1);
}
}
return x;
}
private static void addgoods(){
outline();
System.out.println("\t\t请输入商品信息");
System.out.println("\t\t品名,价格(元),单位");
System.out.println("\t\t回车换行区分");
outline();
syncread();
String name =scanStr();
String nuit =scanStr();
int price = scanint();
Random n=new Random();
String id ;
id=Integer.toString(check(n.nextInt(999)+1));
try{
goodschildnode.put(id, "ID:"+id+" 品名："+name+" 价格："+price+" 单位："+nuit);
syncread();
System.out.println("第"+(goodschildnode.keys().length)+"种商品添加成功");
System.out.println("当前商品"+goodschildnode.keys().length+"种\n"+array+"\n"+array.size());
goods();
} catch (Exception e) {
goods();
}
}
static void jiesuan(){
try{
System.out.println("是否会员？是选1 否选0");
int x= scanint();
if (x==1){
huiyuan = true;
Scanner sc =new Scanner(System.in);
System.out.println("请输入您的会员号：");
int hui = sc.nextInt()/100%10;
if(hui==9){
System.out.println("恭喜你属于幸运会员,可以享受全场八折优惠");
xhuiyuan = true;
}else{
xhuiyuan = false;
}
}else if (x==0) {
huiyuan = false;
}
System.out.println("请输入消费金额:");
Scanner scan =new Scanner(System.in);
if(scan.hasNext()){
s=scan.nextInt();
outline();
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"+bke );
System.out.println("2:满100元，加3元换购" +ke);
System.out.println("3:满100元，加10元换购" +m );
System.out.println("4:满200元，加10元换购" +ss );
System.out.println("5:满200元，加20元换购 " +o );
System.out.println("0：不换购\n请选择：\n" );
outline();
os();
}
} catch (Exception e) {
System.out.println("请输入数字");
jiesuan();
}
}
static void out(String n , double s){
if(!(n==null)){
System.out.println("成功换购"+n);
}
System.out.println("本次消费总金额："+s+"元");
if (huiyuan && xhuiyuan){
System.out.println("尊敬的幸运会员，本次消费享受8折优惠");
double x =s*0.8;
System.out.println("折扣为您节省："+(s-x)+"元");
}else if (huiyuan) {
System.out.println("尊敬的会员，本次消费享受9折优惠");
double x =s*0.9;
System.out.println("折扣为您节省："+(s-x)+"元");
}
System.out.println("实际消费总金额："+s+"元");
showMain();
}
static void os(){
switch (scanint()) {
case 0:
out(null,s);
case 1:
if(s>=52){
out(bke,s+2);
}else{
Err();
}
case 2:
if(s>=103){
out(ke,s+3);
}else{
Err();
}
break;
case 3:
if(s>=110){
out(m,s+10);
}else{
Err();
}
break;
case 4:
if(s>=210){
out(ss,s+10);
}else{
Err();
}
break;
case 5:
if(s>=220){
out(o,s+20);
}else{
Err();
}
break;
default:
System.out.println("请重新选择");
os();
}
}
static void Err(){
System.out.println("金额不足\n");
main(null);
}
static class user{
static ArrayList<String>array=new ArrayList<>();
static Preferences nodes = Preferences.systemRoot().node("user"); //创建节点
static Preferences childnode = nodes.node( "user");  //创建子节点
public user() {
outline();
System.out.println("\t\t1,添加用户");
System.out.println("\t\t2,删除用户");
System.out.println("\t\t3,显示用户");
System.out.println("\t\t4,返回上级");
outline();
try {
int x=scanint();
switch (x) {
case 1:
add();
break;
case 2:
deluser();
break;
case 3:
show();
break;
case 4:
showMain();
break;
default:
System.out.println("没有您要的选项！请重新选择");
new user();
break;
}
} catch (Exception e) {
new user();
}
}
private void deluser() throws BackingStoreException {
System.out.println("请选择要删除用户的ID：\n按0返回上级");
try {
Scanner scan =new Scanner(System.in);
int x = scan.nextInt();
boolean remove=false;
for (int i=0;i<array.size();i++){
if(x==Integer.parseInt(array.get(i))){
remove=true;
}
}
if (remove){
childnode.remove(Integer.toString(x));
System.out.println("删除成功");
}else if (x==0) {
new user();
}else {
System.out.println("没有此用户！");
deluser();
}
new user();
} catch (Exception e) {
System.out.println("请输入数字");
deluser();
}
}
private static void show() {
try {
int leng =childnode.keys().length;
syncread();
if(leng==0){
System.out.println("没有用户");
}else{
System.out.println("当前有"+childnode.keys().length+"位用户");
for(int i = 0;i<=childnode.keys().length;i++){
String shows =childnode.get(childnode.keys()[i], "");
System.out.println(shows);
System.out.println("──────────────────────────────────────────────");
}
}
} catch (BackingStoreException e) {
}
new user();
}
private static void syncread() {
try {
String[] arr= childnode.keys();
childnode.sync();
array.clear();
for(int i=0;i<arr.length;i++){
array.add(arr[i]);
}
} catch (Exception e) {
}
}
private static void add(){
Preferences nodes = Preferences.systemRoot().node("user"); //创建节点
Preferences childnode = nodes.node( "user");  //创建子节点
outline();
System.out.println("\t\t请输入用户信息");
System.out.println("\t\t姓名,6位卡号,年龄,电话");
System.out.println("\t\t回车换行区分");
outline();
syncread();
String name =scanStr();
int card = scanint();
int age =scanint();
String tel =scanStr();
Random n=new Random();
String id ;
id = Integer.toString(n.nextInt(999)+1);
try{
childnode.put(id, "ID:"+id+" 姓名："+name+" 卡号："+card+" 年龄："+age+" 电话："+tel);
syncread();
System.out.println("第"+(childnode.keys().length)+"位会员添加成功");
System.out.println("当前用户"+childnode.keys().length+"位\n"+array+"\n"+array.size());
new user();
} catch (Exception e) {
new user();
}
}
}
}