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Java零基础

萌宠菠菠乐园
2024-11-02 09:25

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); } }