目录
点餐系统的设计
1.设计逻辑
2.菜品类的定义：
3.测试类代码：
完整正确代码：
点餐系统的设计
1.设计逻辑
2.菜品类的定义：
public class Dish {
private String name; //名字
private Double price; //价格
private Integer stock; //库存
private Integer saleNum;//销售量
private Integer likeNum;//点赞数
public void show(){
System.out.println("*****" + "名称:" + this.name + "*****");
System.out.println("价格:" + this.price + "t库存" + this.stock + "t已售:" + this.saleNum + "t点赞数" + this.likeNum);
System.out.println("*******************************");
}
//销售量统计方法
public void saleOut(int n){
this.saleNum += n;
}
//库存变化
public void stockOut(int n){
this.stock -= n;
}
//点赞功能
public void like(){
this.likeNum ++;
}
public Dish() {
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Double getPrice() {
return price;
}
public void setPrice(Double price) {
this.price = price;
}
public Integer getStock() {
return stock;
}
public void setStock(Integer stock) {
this.stock = stock;
}
public Integer getSaleNum() {
return saleNum;
}
public void setSaleNum(Integer saleNum) {
this.saleNum = saleNum;
}
public Integer getLikeNum() {
return likeNum;
}
public void setLikeNum(Integer likeNum) {
this.likeNum = likeNum;
}
}
3.测试类代码：
看下面一段菜品添加代码：
添加一个菜品烤猪蹄：
此时点餐刚刚添加的烤猪蹄
有什么问题？
其中代码主要部分：
正确代码，加上两段设值0：
调试结果：
点赞功能：
完整正确代码：
import java.util.Scanner;
public class Demo01 {
static Scanner sc = new Scanner(System.in);
static Dish[] dishArr = new Dish[10];
static {
Dish dish1 = new Dish();
dish1.setName("糖醋排骨");
dish1.setPrice(50.0);
dish1.setStock(10);
dish1.setSaleNum(100);
dish1.setLikeNum(20);
dishArr[0] = dish1;
Dish dish2 = new Dish();
dish2.setName("波士顿大龙虾");
dish2.setPrice(2500.0);
dish2.setStock(0);
dish2.setSaleNum(10);
dish2.setLikeNum(5);
dishArr[1] = dish2;
Dish dish3 = new Dish();
dish3.setName("面包诱惑");
dish3.setPrice(40.0);
dish3.setStock(5);
dish3.setSaleNum(100);
dish3.setLikeNum(66);
dishArr[2] = dish3;
}
public static void main(String[] args) {
int choice = 0;
do {
System.out.println("*****欢迎来到点餐系统*****");
System.out.println("1.菜品展示");
System.out.println("2.添加菜品");
System.out.println("3.删除菜品");
System.out.println("4.菜品数组扩容");
System.out.println("5.点餐");
System.out.println("6.点赞");
System.out.println("7.退出");
System.out.println("请选择业务:");
choice = sc.nextInt();
switch (choice){
case 1:
display();
break;
case 2:
addDish();
break;
case 3:
deleteDish();
break;
case 4:
dilatation();
break;
case 5:
saleDish();
break;
case 6:
likeDish();
break;
}
}while(choice != 7);
System.out.println("下次再来byebye~");
}
//1.展示
private static void display() {
System.out.println("欢迎进入菜品展示业务!");
for (int i = 0; i < dishArr.length; i++) {
System.out.print((i+1) + "号菜品:");
if(dishArr[i] == null){
System.out.println("未登记");
}else {
dishArr[i].show();
System.out.println();
}
}
}
//2.添加
private static void addDish() {
if(dishArr[dishArr.length-1] != null){
System.out.println("菜品已满,请先扩容!");
return;
}else {
System.out.println("*****进入添加菜品业务*****");
Dish dish = new Dish();
System.out.println("请输入要添加的菜品名称:");
dish.setName(sc.next());
System.out.println("请输入要添加的菜品价格:");
dish.setPrice(sc.nextDouble());
System.out.println("请输入该菜品的库存数量:");
dish.setStock(sc.nextInt());
for (int i = 0; i < dishArr.length; i++) {
if(dishArr[i] == null){
dishArr[i] = dish;
dish.setSaleNum(0);
dish.setLikeNum(0);
System.out.println("菜品添加成功!");
break;
}
}
}
}
//3.删除(删除后前移)
private static void deleteDish() {
System.out.println("*****欢迎进入删除菜品服务*****");
display();
System.out.println("请输入要删除的菜品号:");
Integer no = sc.nextInt() - 1;
if(dishArr[no] == null){
System.out.println("菜品不存在，无法删除!");
return;
}else if(dishArr[no].getStock() != 0 ){ //有剩余库存不删除
System.out.println("仍有库存,无法删除!");
return;
}else {
for (int i = no; i < dishArr.length-1; i++) {
dishArr[i] = dishArr[i+1];
}
System.out.println("菜品删除成功！");
}
}
//4.扩容
private static void dilatation() {
System.out.println("扩容前菜品数组长度:" + dishArr.length);
Dish[] newDishArr = new Dish[dishArr.length + 10];
for (int i = 0; i < dishArr.length; i++) {
newDishArr[i] = dishArr[i];
}
dishArr = newDishArr;
System.out.println("扩容后菜品数组长度:" + dishArr.length);
}
//5.点餐
private static void saleDish() {
System.out.println("*****欢迎进入点餐业务*****");
display();
System.out.println("请输入要点的菜品编号:");
Integer i = sc.nextInt();
if(dishArr[i-1] == null){
System.out.println("不存在该菜品，无法点餐!");
return;
}else if(dishArr[i-1].getStock() <= 0){
System.out.println("菜品数量不足,无法点餐!");
return;
}else if(dishArr[i-1].getStock() != 0){
System.out.println("请输入要点的份数:");
Integer n = sc.nextInt();
if(n > dishArr[i-1].getStock()){
System.out.println("点餐数量超过库存数，无法点餐!");
return;
}else if(n <= 0 ) {
System.out.println("输入有误,无法点餐!");
return;
}else {
Double money = (dishArr[i-1].getPrice()) * n;
System.out.println("你需要支付费用:" + money);
System.out.println("请输入缴费金额:");
if (sc.nextDouble() >= money) {
System.out.println("缴费成功，等待用餐!");
dishArr[i-1].saleOut(n); //调用销售量统计方法
dishArr[i-1].stockOut(n); //调用库存变化方法
} else {
System.out.println("金额不足,缴费失败!");
}
}
}
}
//6.点赞
private static void likeDish() {
System.out.println("*****进入点餐业务*****");
display();
System.out.println("请输入你要点赞的菜品:");
Integer i = sc.nextInt();
if(dishArr[i-1] == null){
System.out.println("不存在该菜品，无法点赞!");
return;
}else {
dishArr[i-1].like();
System.out.println("点赞成功!");
}
}
}
