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backend-quiz

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English
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Chinese

backend-quiz - Kotlin/Spring Backend Quiz

backend-quiz - Kotlin/Spring后端测试题

Adaptive quiz and coding exercises for Kotlin/Spring backend.
针对Kotlin/Spring后端的自适应测试题与编程练习。

Instructions

使用说明

Give a Kotlin/Spring backend quiz. Difficulty adjusts automatically based on the learner's level.
生成一套Kotlin/Spring后端测试题，难度会根据学习者的水平自动调整。

Step 0: Language Selection

步骤0：语言选择

Ask the user to choose a language at the start using AskUserQuestion:
questions:
  - question: "Which language do you prefer? / 어떤 언어로 진행할까요?"
    header: "Language"
    options:
      - label: "한국어"
        description: "한국어로 퀴즈를 풉니다"
      - label: "English"
        description: "Take the quiz in English"
    multiSelect: false
Use the selected language for all communication. Code and Kotlin/Spring keywords stay in English.
在开始时使用AskUserQuestion询问用户选择语言：
questions:
  - question: "Which language do you prefer? / 어떤 언어로 진행할까요?"
    header: "Language"
    options:
      - label: "한국어"
        description: "한국어로 퀴즈를 풉니다"
      - label: "English"
        description: "Take the quiz in English"
    multiSelect: false
所有沟通都使用用户选择的语言。代码与Kotlin/Spring相关关键字保持英文。

Step 1: Choose Quiz Topic

步骤1：选择测试主题

Ask in plain text:
Korean: "어떤 주제로 퀴즈를 풀까요? 주제를 알려주세요. 뭘 할지 모르겠으면 '추천해줘'라고 해주세요."
English: "What topic should the quiz cover? Tell me a topic, or say 'recommend' if you're not sure."
  • If the user enters a topic: start the quiz on that topic.
  • If the user says "recommend" / "추천해줘": check learning history (BackendLearningProgress in memory) and suggest 3-4 recently studied topics. Present choices via AskUserQuestion.
用纯文本询问：
韩语： "어떤 주제로 퀴즈를 풀까요? 주제를 알려주세요. 뭘 할지 모르겠으면 '추천해줘'라고 해주세요."
英语： "What topic should the quiz cover? Tell me a topic, or say 'recommend' if you're not sure."
  • 如果用户输入一个主题：开始该主题的测试。
  • 如果用户说“recommend” / "추천해줘"：查看学习历史（内存中的BackendLearningProgress）并推荐3-4个近期学习的主题。通过AskUserQuestion呈现选项。

Step 2: Run the Quiz (5 questions)

步骤2：运行测试（5道题）

5 questions total. Track difficulty internally from 1-5 (start at 3).
  • Correct answer -> difficulty +1
  • Wrong answer -> difficulty -1
共5道题目。内部跟踪难度等级1-5（初始为3）。
  • 回答正确 → 难度+1
  • 回答错误 → 难度-1

Question Types

题型

Each question uses one of the types below. Default to open-ended, mix in others as appropriate.
每个题目使用以下题型之一。默认使用开放式题型，酌情混合其他题型。

Type A: Predict Output (open-ended)

题型A：预测输出（开放式）

What does this code return? Explain your answer.

@Transactional
fun transfer(from: Long, to: Long, amount: Int) {
    val sender = accountRepository.findById(from).orElseThrow()
    val receiver = accountRepository.findById(to).orElseThrow()
    sender.balance -= amount
    receiver.balance += amount
}
// What happens if amount > sender.balance?
The user types their own answer.
What does this code return? Explain your answer.

@Transactional
fun transfer(from: Long, to: Long, amount: Int) {
    val sender = accountRepository.findById(from).orElseThrow()
    val receiver = accountRepository.findById(to).orElseThrow()
    sender.balance -= amount
    receiver.balance += amount
}
// What happens if amount > sender.balance?
用户需自行撰写答案。

Type B: Find the Bug (open-ended)

题型B：查找漏洞（开放式）

What's wrong with this code? Explain the issue.

@RestController
class UserController(private val userService: UserService) {
    @GetMapping("/users/{id}")
    fun getUser(@PathVariable id: Long): User {
        return userService.findById(id)  // returns null if not found
    }
}
The user types their own answer.
What's wrong with this code? Explain the issue.

@RestController
class UserController(private val userService: UserService) {
    @GetMapping("/users/{id}")
    fun getUser(@PathVariable id: Long): User {
        return userService.findById(id)  // returns null if not found
    }
}
用户需自行撰写答案。

Type C: Concept Question (multiple-choice allowed)

题型C：概念题（可使用选择题）

What is the default propagation level of @Transactional in Spring?
Present 4 choices via AskUserQuestion. Multiple-choice is fine for concept checks.
What is the default propagation level of @Transactional in Spring?
通过AskUserQuestion呈现4个选项。概念检查可使用选择题。

Type D: Write Code (difficulty 4+ only)

题型D：编写代码（仅难度4及以上）

Write a REST endpoint that meets these requirements:

- POST /api/users
- Accepts a JSON body with name (String) and email (String)
- Validates that email contains '@'
- Returns 201 Created with the saved user
- Returns 400 Bad Request if validation fails
The user writes their own code solution.
Write a REST endpoint that meets these requirements:

- POST /api/users
- Accepts a JSON body with name (String) and email (String)
- Validates that email contains '@'
- Returns 201 Created with the saved user
- Returns 400 Bad Request if validation fails
用户需自行编写代码解决方案。

Feedback Rules

反馈规则

On correct answer:
Correct!

Key point: @Transactional with default propagation (REQUIRED) joins
the existing transaction or creates a new one if none exists.
On wrong answer: Give a short text explanation. Only use ASCII diagrams for things like request flows or architecture that are hard to explain in text alone.
Not quite. The answer is "REQUIRED".

REQUIRED means: if a transaction exists, join it; if not, create a new one.
This is the most common behavior and Spring's default.
回答正确时：
Correct!

Key point: @Transactional with default propagation (REQUIRED) joins
the existing transaction or creates a new one if none exists.
回答错误时： 提供简短的文字解释。仅在需要解释请求流程或架构等难以用文字说明的内容时使用ASCII图。
Not quite. The answer is "REQUIRED".

REQUIRED means: if a transaction exists, join it; if not, create a new one.
This is the most common behavior and Spring's default.

Step 3: Results Summary

步骤3：结果总结

After all 5 questions, show a summary:
Quiz Results
- Topic: Spring Transaction Management
- Score: 3/5
- Final difficulty: 4/5
- Strengths: @Transactional basics, isolation levels
- Needs work: Propagation types, rollback rules
- Suggestion: Review "transaction propagation" with /backend-study
完成所有5道题后，展示总结：
Quiz Results
- Topic: Spring Transaction Management
- Score: 3/5
- Final difficulty: 4/5
- Strengths: @Transactional basics, isolation levels
- Needs work: Propagation types, rollback rules
- Suggestion: Review "transaction propagation" with /backend-study

Rules

规则

  1. Use the selected language - from Step 0. Only code and keywords in English.
  2. One question at a time - next question only after the current one is answered
  3. Open-ended by default - the user must think and write answers. Multiple-choice OK for concept checks.
  4. ASCII diagrams only when needed - default to text explanations
  5. Adaptive difficulty - adjust to the learner's level automatically
  6. Encouraging tone - wrong answers are learning opportunities
  7. No emojis - clean text only
  1. 使用选定语言 - 来自步骤0。仅代码和关键字使用英文。
  2. 一次一题 - 只有当前题目回答完成后才会展示下一题
  3. 默认开放式题型 - 用户必须思考并撰写答案。概念检查可使用选择题。
  4. 仅必要时使用ASCII图 - 默认使用文字解释
  5. 自适应难度 - 根据学习者的水平自动调整
  6. 鼓励性语气 - 错误的答案是学习的机会
  7. 禁止使用表情符号 - 仅使用简洁文本