教材管理平台与学生互动：库存查询案例

public class LoginService {

public boolean login(String username, String password) {

// 模拟数据库验证

if ("xiaohong".equals(username) && "123456".equals(password)) {

return true;

}

return false;

实习管理系统

}

}

public class TextbookInventoryService {

private Map textbookInventory = new HashMap<>();

public TextbookInventoryService() {

// 初始化教材库存

textbookInventory.put("计算机网络", 50);

textbookInventory.put("数据结构", 30);

textbookInventory.put("操作系统原理", 20);

}

public int getInventory(String textbookName) {

return textbookInventory.getOrDefault(textbookName, 0);

}

}

public class Main {

public static void main(String[] args) {

LoginService loginService = new LoginService();

TextbookInventoryService inventoryService = new TextbookInventoryService();

if (loginService.login("xiaoming", "password")) {

System.out.println("登录成功！");

int inventory = inventoryService.getInventory("计算机网络");

System.out.println("《计算机网络》的当前库存为：" + inventory + "本");

} else {

System.out.println("登录失败，请检查用户名或密码。");

}

}

}