// 核心对象接口
interface Person {
    String getName();
    void addRole(Role role);
    void removeRole(Class<? extends Role> roleType);
    <T extends Role> T getRole(Class<T> roleType);
}

// 角色接口
interface Role {
    String roleName();
}

// 具体实现
class PersonImpl implements Person {
    private String name;
    private Map<Class<? extends Role>, Role> roles = new HashMap<>();
    
    public PersonImpl(String name) {
        this.name = name;
    }
    
    @Override
    public String getName() {
        return name;
    }
    
    @Override
    public void addRole(Role role) {
        roles.put(role.getClass(), role);
    }
    
    @Override
    public void removeRole(Class<? extends Role> roleType) {
        roles.remove(roleType);
    }
    
    @Override
    public <T extends Role> T getRole(Class<T> roleType) {
        return roleType.cast(roles.get(roleType));
    }
}

// 具体角色
class EmployeeRole implements Role {
    @Override
    public String roleName() {
        return "Employee";
    }
    
    public void work() {
        System.out.println("Working...");
    }
}

class CustomerRole implements Role {
    @Override
    public String roleName() {
        return "Customer";
    }
    
    public void purchase() {
        System.out.println("Purchasing...");
    }
}

// 使用示例
public class Main {
    public static void main(String[] args) {
        Person person = new PersonImpl("John Doe");
        
        // 添加员工角色
        person.addRole(new EmployeeRole());
        person.getRole(EmployeeRole.class).work();
        
        // 添加客户角色
        person.addRole(new CustomerRole());
        person.getRole(CustomerRole.class).purchase();
        
        // 移除员工角色
        person.removeRole(EmployeeRole.class);
    }
}