Java零基础-面向对象入门案例：宠物商店
案例需求：
设计宠物类，包含有：编号、名称、年龄、种类、性别、是否防疫等信息，
设计宠物商店，实现宠物添加、删除、修改宠物信息，记录宠物是否出售等
Pet类
package pet;
public class Pet {
private Integer id;
private String name;
private Integer age;
private String kind;
private String sex;
private String isEpidemicPrevention;
public Pet() {}
// get、set方法
...
}
PetStore
package pet;
import java.util.*;
public class PetStore {
private ArrayList<Pet> arrayList;
private Map<Integer,String> map;
public PetStore() {
this.arrayList = new ArrayList<>();
this.map = new HashMap<>();
}
/**
* 添加宠物进入商店
* @return 商店中已存在id一致的宠物则返回false
*/
public Pet selectPet(int pet_id){
for (Pet pet : arrayList) {
if (pet_id == pet.getId()){
return pet;
}
}
return null;
}
/**
* 在商店中查询宠物信息
* @return 商店中不存在该宠物则返回false
*/
public boolean addPet(Pet pet){
if(selectPet(pet.getId()) != null){
return false;
}
arrayList.add(pet);
map.put(pet.getId(),"否");
return true;
}
/**
* 将宠物从商店删除
* @return 商店中若不存在该宠物id则返回false
*/
public boolean delPet(int pet_id){
Pet pet = selectPet(pet_id);
if(pet == null){
return false;
}
arrayList.remove(pet);
map.remove(pet_id);
return true;
}
/**
* 将宠物信息修改
* @return 商店中若不存在该宠物id则返回false
*/
public Pet updPet(int pet_id,Pet changeInfo){
Pet pet = selectPet(pet_id);
if(pet == null){
return null;
}
pet.setAge(changeInfo.getAge() == null ? pet.getAge() : changeInfo.getAge());
pet.setKind(changeInfo.getKind() == null ? pet.getKind() : changeInfo.getKind());
pet.setName(changeInfo.getName() == null ? pet.getName() : changeInfo.getName());
pet.setSex(changeInfo.getSex() == null ? pet.getSex() : changeInfo.getSex());
pet.setEpidemicPrevention(changeInfo.getEpidemicPrevention() == null ? pet.getEpidemicPrevention() : changeInfo.getEpidemicPrevention());
return pet;
}
/**
* 记录宠物是否售卖
* @return 商店中若不存在该宠物id则返回false
*/
public boolean recordSell(Integer pet_id,String str){
if(selectPet(pet_id) == null){
return false;
}
map.put(pet_id,str);
return true;
}
/**
* 查询宠物是否售卖
* @return 商店中若不存在该宠物id则返回false
*/
public String selectSell(Integer pet_id){
return map.get(pet_id);
}
}
Start：实现页面显示
package pet;
import java.util.Scanner;
public class Start {
public static void showStore(){
System.out.println("========== 宠物商店 ==========");
System.out.println("========== 1、查询宠物信息 ==========");
System.out.println("========== 2、添加宠物信息 ==========");
System.out.println("========== 3、删除宠物信息 ==========");
System.out.println("========== 4、修改宠物信息 ==========");
System.out.println("========== 5、登记宠物出售 ==========");
System.out.println("========== 6、查询宠物出售 ==========");
System.out.println("========== 0、退出宠物商店 ==========");
}
public static void receiveInfo(PetStore petStore){
Scanner scanner = new Scanner(System.in);
boolean exit = true;
int storeOperate;
while(exit){
storeOperate = scanner.nextInt();
// 增强性Switch - 新特性
switch (storeOperate) {
case 0 -> exit = false;
case 1 -> selectPet(petStore, scanner);
case 2 -> addPet(petStore, scanner);
case 3 -> delPet(petStore, scanner);
case 4 -> updPet(petStore, scanner);
case 5 -> recordSell(petStore, scanner);
case 6 -> selectSell(petStore, scanner);
default -> System.out.println("输入错误请重试");
}
}
}
private static void selectSell(PetStore petStore, Scanner scanner) {
int pet_id = inputPetID(scanner);
String state = petStore.selectSell(pet_id);
if (state != null){
System.out.println("宠物出售状态" + petStore.selectSell(pet_id));
} else {
System.out.println("宠物不存在");
}
}
private static void recordSell(PetStore petStore, Scanner scanner) {
int pet_id = inputPetID(scanner);
System.out.println("是否已经出售该宠物");
String isSell = scanner.next();
petStore.recordSell(pet_id,isSell);
if (petStore.recordSell(pet_id,isSell)){
System.out.println("登记成功");
} else {
System.out.println("宠物编号不存在，请重试！");
}
}
private static void updPet(PetStore petStore, Scanner scanner) {
int pet_id = inputPetID(scanner);
Pet pet = new Pet();
System.out.println("请需要修改的宠物信息：");
System.out.print("姓名：");
pet.setName(scanner.next());
System.out.print("年龄：");
pet.setAge(scanner.nextInt());
System.out.print("性别：");
pet.setSex(scanner.next());
System.out.print("品种：");
pet.setKind(scanner.next());
System.out.print("是否防疫：");
pet.setEpidemicPrevention(scanner.next());
Pet upPet = petStore.updPet(pet_id,pet);
if (upPet != null){
System.out.println("修改成功，宠物信息如下：");
System.out.println("编号：" + upPet.getId());
System.out.println("姓名：" + upPet.getName());
System.out.println("年龄：" + upPet.getAge());
System.out.println("性别：" + upPet.getSex());
System.out.println("品种：" + upPet.getKind());
System.out.println("是否防疫：" + upPet.getEpidemicPrevention());
} else {
System.out.println("宠物编号不存在，请重试！");
}
}
private static void delPet(PetStore petStore, Scanner scanner) {
int pet_id = inputPetID(scanner);
if (petStore.delPet(pet_id)){
System.out.println("该宠物已被删除");
} else {
System.out.println("宠物编号不存在，请重试！");
}
}
private static void addPet(PetStore petStore, Scanner scanner) {
Pet pet = new Pet();
System.out.println("请输入宠物信息：");
System.out.print("编号：");
pet.setId(scanner.nextInt());
System.out.print("姓名：");
pet.setName(scanner.next());
System.out.print("年龄：");
pet.setAge(scanner.nextInt());
System.out.print("性别：");
pet.setSex(scanner.next());
System.out.print("品种：");
pet.setKind(scanner.next());
System.out.print("是否防疫：");
pet.setEpidemicPrevention(scanner.next());
if(petStore.addPet(pet)){
System.out.println("添加成功");
} else{
System.out.println("添加失败");
}
}
private static void selectPet(PetStore petStore, Scanner scanner) {
int pet_id = inputPetID(scanner);
Pet pet = petStore.selectPet(pet_id);
if (pet != null){
System.out.println("宠物信息如下：");
System.out.println("编号：" + pet.getId());
System.out.println("姓名：" + pet.getName());
System.out.println("年龄：" + pet.getAge());
System.out.println("性别：" + pet.getSex());
System.out.println("品种：" + pet.getKind());
System.out.println("是否防疫：" + pet.getEpidemicPrevention());
} else {
System.out.println("宠物编号不存在，请重试！");
}
}
private static int inputPetID(Scanner scanner) {
int pet_id;
System.out.println("请输入宠物编号");
pet_id = scanner.nextInt();
return pet_id;
}
public static void main(String[] args) {
PetStore petStore = new PetStore();
showStore();
receiveInfo(petStore);
}
}