重用扩展特定类的泛型类型T

// 泛型基类
public abstract class BaseEntity<T> {
    private T id;

    public BaseEntity(T id) {
        this.id = id;
    }

    public T getId() {
        return id;
    }
}

// 扩展泛型基类
public class User extends BaseEntity<Integer> {
    private String name;

    public User(Integer id, String name) {
        super(id);
        this.name = name;
    }

    public String getName() {
        return name;
    }
}

// 使用示例
public class Main {
    public static void main(String[] args) {
        User user = new User(1, "Alice");
        System.out.println("User ID: " + user.getId());
        System.out.println("User Name: " + user.getName());
    }
}

public class GenericClass<T> {
    private Class<T> type;

    public GenericClass(Class<T> type) {
        this.type = type;
    }

    public T createInstance() throws InstantiationException, IllegalAccessException {
        return type.newInstance();
    }
}