提示：
文章目录- 前言
- 一、知识点
- 二、使用步骤
- 1.引入库创建对象属性和接受参数的方法
- 2.读入数据编写管理类的方法
- 3.测试类
- 三、总结
前言
提示：java书中的网上订餐系统。
例如：随着现在的网络越来越发达，点外卖也越来越受欢迎，所以今天就敲一个简单的网上订餐系统
提示：以下是本篇文章正文内容，下面案例可供参考
一、知识点：
1.变量 2.数据类型 3.循环结构 4.选择结构 5.数组 6.类和对象
二、使用步骤
1.创建对象属性和接受参数的方法
代码如下：
public class MydinnerSystem {
// 菜品名称
String[] dinnerName = new String[100];
//菜品价格
int[] dinnerPrice = new int[100];
//签收订单
int[] states = new int[100];
//菜品的赞数
int[] zan = new int[100];
//客户昵称
String[] name = new String[100];
//客户地址
String[] address = new String[100];
//客户送餐时间
int[] time = new int[100];
//客户所选菜品总金额
double[] money = new double[100];
//接收的次数
int count = 0;
//接收点赞的次数
int zancount = 0;
public void show(String name, String address, int time, double money, String dinnerName) {
this.name[count] = name;
this.address[count] = address;
this.money[count] = money;
this.time[count] = time;
this.dinnerName[count] = dinnerName;
count++;
}
public void showzan(int zan, int num) {
for (int i = 0; i < this.zan.length; i++) {
if (num == i + 1) {
this.zan[i] += zan;
}
}
}
}
2.编写管理类的方法
代码如下：
import java.util.Scanner;
public class MydinnerBiz {
MydinnerSystem[] a = new MydinnerSystem[100];
String[] dinnerName = new String[] { "鲍鱼盖饭", "帝王蟹", "油焖龙虾", "烤全羊" };
double[] dinnerPrice = new double[] { 255, 800, 500, 1100 };
int count;
Scanner input = new Scanner(System.in);
public MydinnerBiz() {
for (int i = 0; i < a.length; i++) {
System.out.println("欢迎使用:“吃货联盟订餐系统");
System.out.println("********************");
System.out.println("1.我要订餐");
System.out.println("2.查看餐袋");
System.out.println("3.签收订单");
System.out.println("4.删除订单");
System.out.println("5.我要点赞");
System.out.println("6.退出系统");
System.out.println("请选择");
switch (input.nextInt()) {
case 1:
System.out.println("******我要订餐******");
ding();
break;
case 2:
System.out.println("******查看餐袋******");
showCaidan();
break;
case 3:
System.out.println("******签收订单******");
qianshow();
break;
case 4:
System.out.println("******删除订单******");
deleteshow();
break;
case 5:
System.out.println("******我要点赞******");
zanshow();
break;
case 6:
System.out.println("******退出系统******");
return;
default:
System.out.println("输入错误！");
break;
}
}
}
MydinnerSystem b = new MydinnerSystem();
public void ding() {
//送餐费
double deliCharge=0;
//消费总额
double money;
//点菜名称
String dinner = null;
System.out.println("请输入姓名：");
String name = input.next();
System.out.println("序号t菜品t单价t点赞");
for (int i = 0; i < dinnerName.length; i++) {
if (dinnerName[i] != null) {
System.out.println((i + 1) + "t" + dinnerName[i] + "t" + dinnerPrice[i] + "t" + b.zan[i]);
}
}
System.out.println("请选择菜品编号：");
int num = input.nextInt();
System.out.println("请输入几份");
int num1 = input.nextInt();
System.out.println("请输入订餐时间（送餐时间10点到20点整点送餐");
int time = input.nextInt();
if (time < 10 || time > 20) {
System.out.println("您的输入有误，请输入10点~20点间的整数");
return;
}
System.out.println("请输入送餐地址");
String address = input.next();
switch (num) {
case 1:
money = dinnerPrice[0] * num1;
if(money<300) {
deliCharge=20;
money+=deliCharge;
}
System.out.println("订餐成功！");
System.out.println("您订的是：" + dinnerName[0] + num1+"份t" + "订餐时间是："+time+"点"+"t餐费：" + money+"元，送餐费："+deliCharge+"元"+"总计："+money);
dinner = "鲍鱼盖饭";
b.show(name, address, time, money, dinner);
a[count] = b;
count++;
break;
case 2:
money = dinnerPrice[1] * num1;
System.out.println("订餐成功！");
System.out.println("您订的是：" + dinnerName[1] + num1+"份t" + "订餐时间是："+time+"点"+"t餐费：" + money+"元，送餐费："+deliCharge+"元"+"总计："+money);
dinner = "帝王蟹";
b.show(name, address, time, money, dinner);
a[count] = b;
count++;
break;
case 3:
money = dinnerPrice[2] * num1;
System.out.println("订餐成功！");
System.out.println("您订的是：" + dinnerName[2] + num1+"份t" + "订餐时间是："+time+"点"+"t餐费：" + money+"元，送餐费："+deliCharge+"元"+"总计："+money);
dinner = "油焖龙虾";
b.show(name, address, time, money, dinner);
a[count] = b;
count++;
break;
case 4:
money = dinnerPrice[3] * num1;
System.out.println("订餐成功！");
System.out.println("您订的是：" + dinnerName[3] + num1+"份t" + "订餐时间是："+time+"点"+"t餐费：" + money+"元，送餐费："+deliCharge+"元"+"总计："+money);
dinner = "烤全羊";
b.show(name, address, time, money, dinner);
a[count] = b;
count++;
break;
default:
System.out.println("输入错误");
break;
}
}
public void showCaidan() {
System.out.println("序号t姓名t地址t菜品t总价t时间t订单状态");
for (int i = 0; i < count; i++) {
String states = (a[i].states[i] == 0) ? "已预订" : "已完成";
if (a[i].name[i] != null && a[i].address[i] != null && dinnerName[i] != null && a[i].money[i] != 0
&& a[i].time[i] != 0) {
System.out.println((i + 1) + "t" + a[i].name[i] + "t" + a[i].address[i] + "t" + a[i].dinnerName[i]
+ "t" + a[i].money[i] + "元t" + a[i].time[i] + "点t" + states);
}
}
}
public void qianshow() {
System.out.println("请输入订单编号");
int num = input.nextInt();
for (int i = 0; i < count; i++) {
if (b.name[i] != null && b.states[i] == 0 && num == i + 1) {
b.states[i] = 1;
System.out.println("订单签收成功！");
} else if (b.name[i] != null && b.states[i] == 1 && num == i + 1) {
System.out.println("您选择的订单已完成签收，不能再次签收！");
return;
} else {
if (i + 1 == count) {
System.out.println("没有找到该订单！");
}
continue;
}
}
}
public void deleteshow() {
System.out.println("请输入要删除的订单编号：");
int num = input.nextInt();
for (int i = 0; i < count; i++) {
if (b.name[i] != null && num == i + 1) {
b.name = null;
b.address[i] = null;
b.time[i] = 0;
b.dinnerName[i] = null;
b.money[i] = 0;
b.states[i] = 0;
count -= 1;
System.out.println("删除成功！");
} else {
System.out.println("没有找到该订单");
}
}
}
public void zanshow() {
int zan = 0;
System.out.println("请输入点赞的菜品号");
int num = input.nextInt();
for (int i = 0; i < dinnerName.length; i++) {
if (num == i + 1) {
zan += 5;
System.out.println("点赞成功！");
b.showzan(zan, num);
return;
}
if (i == dinnerName.length - 1) {
System.out.println("没有找到该菜品");
}
}
}
}
3、测试类
代码如下：
public class MydinnerTest {
public static void main(String[] args) {
new MydinnerBiz();
}
}
总结
前期学习尽量扎实点，多敲敲代码和实例，锻炼一下敲代码的逻辑思维，为以后打好基础
毕竟学校里学到工作中都用不到
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