init skill_tree_java dir, add readme

.gitignore

+.vscode
+.idea
+.DS_Store
+__pycache__
+*.pyc
+*.zip
\ No newline at end of file

README.md

 # skill_tree_java
 
-Java 技能树编辑
\ No newline at end of file
+## 初始化
+
+```
+pip install -r requirement.txt
+```
+
+
+## 目录结构说明
+
+* 技能树`骨架文件`：
+    * 位置：`data/tree.json` 
+    * 说明：该文件是执行 `python main.py` 生成的，请勿人工编辑
+* 技能树`根节点`配置文件：
+    * 位置：`data/config.json`
+    * 说明：可编辑配置关键词等字段，其中 `node_id` 字段是生成的，请勿编辑
+* 技能树`难度节点`：
+    * 位置：`data/xxx`，例如: `data/1.Java初阶`
+    * 说明：
+        * 每个技能树有 3 个等级，目录前的序号是必要的，用来保持文件夹目录的顺序
+        * 每个目录下有一个 `config.json` 可配置关键词信息，其中 `node_id` 字段是生成的，请勿编辑
+* 技能树`章节点`：
+    * 位置：`data/xxx/xxx`，例如：`data/1.Java初阶/1.Java概述`
+    * 说明：
+        * 每个技能树的每个难度等级有 n 个章节，目录前的序号是必要的，用来保持文件夹目录的顺序
+        * 每个目录下有一个 `config.json` 可配置关键词信息，其中 `node_id` 字段是生成的，请勿编辑
+* 技能树`知识节点`：
+    * 位置：`data/xxx/xxx/xxx`，例如：`data/1.Java初阶/1.Java概述/1.什么是Java`
+    * 说明：
+        * 每个技能树的每章有 `n` 个知识节点，目录前的序号是必要的，用来保持文件夹目录的顺序
+        * 每个目录下有一个 `config.json`
+            * 其中 `node_id` 字段是生成的，请勿编辑
+            * 其中 `keywords` 可配置关键字字段
+            * 其中 `children` 可配置该`知识节点`下的子树结构信息，参考后面描述
+            * 其中 `export` 可配置该`知识节点`下的导出习题信息，参考后面描述
+
+
+## `知识节点` 子树信息结构
+
+例如 `data/1.Java初阶/1.Java概述/1.什么是Java/config.json` 里配置对该知识节点子树信息结构：
+```json
+{
+    // ...
+
+    "children": [
+        // TODO ...
+    ],
+}
+```
+
+
+
+## `知识节点` 的导出习题编辑
+
+例如 `data/1.Java初阶/1.Java概述/1.什么是Java/config.json` 里配置对该知识节点导出的习题
+
+```json
+{
+    // ...
+    "export": [
+        // TODO ...
+    ]
+}
+```
+
+格式说明：
+* `file`: 指定该目录下的习题源文件
+* `variants`： 指定习题同名的json选项配置文件，参考下一节
+* `depends`: 如果习题依赖同目录下的其他习题源代码，则在此字段里配置依赖的其他习题源文件名
+
+## `知识节点` 的导出习题选项配置编辑
+
+首先，在知识节点下增加一个习题代码，例如在 `data/1.Java初阶/1.Java概述/1.什么是Java` 下增加一个`HelloWorld.java`代码：
+
+```java
+// TODO
+```
+
+其次，增加一个同名的选项配置文件`HelloWorld.json`，目前有两种配置规则
+
+**单行替换规则**：
+
+* 配置由`one_line`字段指定的单行替换字典
+* 格式是：`"<源字符串>"`: [`"<替换字符串A>"`, `<替换字符串B>`,...],
+    * 其中每个 `"<源字符串>"` `/` `"<替换字符串A>"` 被生成为是一个替换选项
+    * 指定的配置应该能至少生成 `3+` 个替换选项
+
+```json
+{
+    // TODO
+}
+```
+
+上面的替换规则会将代码替换成 3 个变种的代码：
+
+```c
+// 变种代码1
+// TODO
+```
+
+```c
+// 变种代码2
+#include <stdio.h>
+int main(int argc, char** argv){
+    print("Hello,Wrold!");
+    return 0
+}
+```
+
+```c
+// 变种代码3
+// TODO
+```
+
+这些变种代码将会作为技能树该知识点该代码选择题的选项。
+
+**多行替换规则**：
+
+* 配置由`multiline`字段指定的多行替换数组
+* 数组的每个元素是一组替换规则，会整组被替换
+
+例如：
+
+```json
+{
+     // TODO
+}
+```
+
+同样，该配置将支持将源代码生成3个变种代码
+
+```java
+// 变种代码1
+// TODO
+```
+
+```java
+// 变种代码2, 注意第2组替换规则，包含了两行替换
+// TODO
+```
+
+```java
+// 变种代码3
+// TODO
+```
+
+## 技能树合成
+
+在根目录下执行 `python main.py` 会合成技能树文件，合成的技能树文件: `data/tree.json`
+* 合成过程中，会自动检查每个目录下 `config.json` 里的 `node_id` 是否存在，不存在则生成
+* 合成过程中，会自动检查每个知识点目录下 `config.json` 里的 `export` 里导出的习题配置，检查是否存在`exercise_id` 字段，如果不存在则生成

data/1.Java初阶/1.Java概述/1.什么是Java/config.json

+{
+  "node_id": "569d5e11c4fc5de7844053d9a733c5e8",
+  "keywords": [],
+  "children": [],
+  "export": []
+}
\ No newline at end of file

data/1.Java初阶/1.Java概述/2.JDK的下载/config.json

+{
+  "node_id": "569d5e11c4fc5de7844053d9a733c5e8",
+  "keywords": [],
+  "children": [],
+  "export": []
+}
\ No newline at end of file

data/1.Java初阶/1.Java概述/3.配置JDK/config.json

+{
+  "node_id": "569d5e11c4fc5de7844053d9a733c5e8",
+  "keywords": [],
+  "children": [],
+  "export": []
+}
\ No newline at end of file

data/1.Java初阶/1.Java概述/4.Java的版本/config.json

+{
+  "node_id": "569d5e11c4fc5de7844053d9a733c5e8",
+  "keywords": [],
+  "children": [],
+  "export": []
+}
\ No newline at end of file

data/1.Java初阶/1.Java概述/5.JavaAPI文档/config.json

+{
+  "node_id": "569d5e11c4fc5de7844053d9a733c5e8",
+  "keywords": [],
+  "children": [],
+  "export": []
+}
\ No newline at end of file

data/1.Java初阶/1.Java概述/6.Java的应用领域/config.json

+{
+  "node_id": "569d5e11c4fc5de7844053d9a733c5e8",
+  "keywords": [],
+  "children": [],
+  "export": []
+}
\ No newline at end of file

data/1.Java初阶/1.Java概述/7.Java API文档/config.json

+{
+  "node_id": "569d5e11c4fc5de7844053d9a733c5e8",
+  "keywords": [],
+  "children": [],
+  "export": []
+}
\ No newline at end of file

data/1.Java初阶/1.Java概述/8.使用IDE/config.json

+{
+  "node_id": "569d5e11c4fc5de7844053d9a733c5e8",
+  "keywords": [],
+  "children": [],
+  "export": []
+}
\ No newline at end of file

data/1.Java初阶/1.Java概述/9.测试开发环境/config.json

+{
+  "node_id": "569d5e11c4fc5de7844053d9a733c5e8",
+  "keywords": [],
+  "children": [],
+  "export": []
+}
\ No newline at end of file

data/1.Java初阶/1.Java概述/config.json

+{
+  "node_id": "569d5e11c4fc5de7844053d9a733c5e8",
+  "keywords": []
+}
\ No newline at end of file

data/1.Java初阶/10.IO/1.IO概述/config.json

+{
+  "node_id": "569d5e11c4fc5de7844053d9a733c5e8",
+  "keywords": [],
+  "children": [],
+  "export": []
+}
\ No newline at end of file

data/1.Java初阶/10.IO/2.字节流/config.json

+{
+  "node_id": "569d5e11c4fc5de7844053d9a733c5e8",
+  "keywords": [],
+  "children": [
+    {
+      "字节流概述": {
+        "keywords": [],
+        "children": []
+      }
+    },
+    {
+      "字节流读写文件": {
+        "keywords": [],
+        "children": []
+      }
+    },
+    {
+      "文件的拷贝": {
+        "keywords": [],
+        "children": []
+      }
+    },
+    {
+      "字节流的缓冲区": {
+        "keywords": [],
+        "children": []
+      }
+    },
+    {
+      "字节缓冲流": {
+        "keywords": [],
+        "children": []
+      }
+    }
+  ],
+  "export": []
+}
\ No newline at end of file

data/1.Java初阶/10.IO/3.File类/config.json

+{
+  "node_id": "569d5e11c4fc5de7844053d9a733c5e8",
+  "keywords": [],
+  "children": [
+    {
+      "File类的常用方法": {
+        "keywords": [],
+        "children": []
+      }
+    },
+    {
+      "遍历目录下的文件": {
+        "keywords": [],
+        "children": []
+      }
+    },
+    {
+      "删除文件及目录": {
+        "keywords": [],
+        "children": []
+      }
+    },
+    {
+      "创建文件对象": {
+        "keywords": [],
+        "children": []
+      }
+    },
+    {
+      "文件操作": {
+        "keywords": [],
+        "children": []
+      }
+    },
+    {
+      "文件夹操作": {
+        "keywords": [],
+        "children": []
+      }
+    },
+    {
+      "目录列表器": {
+        "keywords": [],
+        "children": []
+      }
+    },
+    {
+      "目录实用工具": {
+        "keywords": [],
+        "children": []
+      }
+    },
+    {
+      "目录的检查及创建": {
+        "keywords": [],
+        "children": []
+      }
+    },
+    {
+      "文件的创建与删除": {
+        "keywords": [],
+        "children": []
+      }
+    },
+    {
+      "获取文件信息": {
+        "keywords": [],
+        "children": []
+      }
+    }
+  ],
+  "export": []
+}
\ No newline at end of file

data/1.Java初阶/10.IO/config.json

+{
+  "node_id": "569d5e11c4fc5de7844053d9a733c5e8",
+  "keywords": []
+}
\ No newline at end of file

data/1.Java初阶/11.操作符/1.更简单的打印语句/config.json

+{
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+  "keywords": [],
+  "children": [],
+  "export": []
+}
\ No newline at end of file

data/1.Java初阶/11.操作符/10.移位操作符/config.json

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+  "keywords": [],
+  "children": [],
+  "export": []
+}
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data/1.Java初阶/11.操作符/11.三元操作符if-else/config.json

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+  "keywords": [],
+  "children": [],
+  "export": []
+}
\ No newline at end of file

data/1.Java初阶/11.操作符/12.字符串操作符 + 和 +=/config.json

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+  "keywords": [],
+  "children": [],
+  "export": []
+}
\ No newline at end of file

data/1.Java初阶/11.操作符/13.使用操作符时常犯的错误/config.json

+{
+  "node_id": "569d5e11c4fc5de7844053d9a733c5e8",
+  "keywords": [],
+  "children": [],
+  "export": []
+}
\ No newline at end of file

data/1.Java初阶/11.操作符/14.类型转换操作符/config.json

+{
+  "node_id": "569d5e11c4fc5de7844053d9a733c5e8",
+  "keywords": [],
+  "children": [
+    {
+      "截尾和舍入": {
+        "keywords": [],
+        "children": []
+      }
+    },
+    {
+      "提升": {
+        "keywords": [],
+        "children": []
+      }
+    }
+  ],
+  "export": []
+}
\ No newline at end of file

data/1.Java初阶/11.操作符/15.Java没有“sizeof”/config.json

+{
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+  "keywords": [],
+  "children": [],
+  "export": []
+}
\ No newline at end of file

data/1.Java初阶/11.操作符/2.使用Java操作符/config.json

+{
+  "node_id": "569d5e11c4fc5de7844053d9a733c5e8",
+  "keywords": [],
+  "children": [],
+  "export": []
+}
\ No newline at end of file

data/1.Java初阶/11.操作符/3.优先级/config.json

+{
+  "node_id": "569d5e11c4fc5de7844053d9a733c5e8",
+  "keywords": [],
+  "children": [],
+  "export": []
+}
\ No newline at end of file

data/1.Java初阶/11.操作符/4.赋值/config.json

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+  "keywords": [],
+  "children": [],
+  "export": []
+}
\ No newline at end of file

data/1.Java初阶/11.操作符/5.算术操作符/config.json

+{
+  "node_id": "569d5e11c4fc5de7844053d9a733c5e8",
+  "keywords": [],
+  "children": [
+    {
+      "一元加、减操作符": {
+        "keywords": [],
+        "children": []
+      }
+    }
+  ],
+  "export": []
+}
\ No newline at end of file

data/1.Java初阶/11.操作符/6.自动递增和递减/config.json

+{
+  "node_id": "569d5e11c4fc5de7844053d9a733c5e8",
+  "keywords": [],
+  "children": [],
+  "export": []
+}
\ No newline at end of file

data/1.Java初阶/11.操作符/7.关系操作符/config.json

+{
+  "node_id": "569d5e11c4fc5de7844053d9a733c5e8",
+  "keywords": [],
+  "children": [
+    {
+      "测试对象的等价性": {
+        "keywords": [],
+        "children": []
+      }
+    }
+  ],
+  "export": []
+}
\ No newline at end of file

data/1.Java初阶/11.操作符/8.逻辑操作符/config.json

+{
+  "node_id": "569d5e11c4fc5de7844053d9a733c5e8",
+  "keywords": [],
+  "children": [
+    {
+      "短路": {
+        "keywords": [],
+        "children": []
+      }
+    }
+  ],
+  "export": []
+}
\ No newline at end of file

data/1.Java初阶/11.操作符/9.按位操作符/config.json

+{
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+  "keywords": [],
+  "children": [],
+  "export": []
+}
\ No newline at end of file

data/1.Java初阶/11.操作符/config.json

+{
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+  "keywords": []
+}
\ No newline at end of file

data/1.Java初阶/12.控制执行流程/1.true和false/config.json

+{
+  "node_id": "569d5e11c4fc5de7844053d9a733c5e8",
+  "keywords": [],
+  "children": [],
+  "export": []
+}
\ No newline at end of file

data/1.Java初阶/12.控制执行流程/10.初始化与清理/config.json

+{
+  "node_id": "569d5e11c4fc5de7844053d9a733c5e8",
+  "keywords": [],
+  "children": [
+    {
+      "用构造器确保初始化": {
+        "keywords": [],
+        "children": []
+      }
+    },
+    {
+      "缺省构造器": {
+        "keywords": [],
+        "children": []
+      }
+    },
+    {
+      "成员初始化": {
+        "keywords": [],
+        "children": [
+          {
+            "指定初始化": {
+              "keywords": [],
+              "children": []
+            }
+          }
+        ]
+      }
+    },
+    {
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+        "keywords": [],
+        "children": [
+          {
+            "初始化顺序": {
+              "keywords": [],
+              "children": []
+            }
+          },
+          {
+            "静态数据的初始化": {
+              "keywords": [],
+              "children": []
+            }
+          },
+          {
+            "显式的静态初始化": {
+              "keywords": [],
+              "children": []
+            }
+          }
+        ]
+      }
+    },
+    {
+      "数组初始化": {
+        "keywords": [],
+        "children": [
+          {
+            "可变参数列表": {
+              "keywords": [],
+              "children": []
+            }
+          }
+        ]
+      }
+    },
+    {
+      "枚举类型": {
+        "keywords": [],
+        "children": [
+          {
+            "基本enum特性": {
+              "keywords": [],
+              "children": [
+                {
+                  "将静态导入用于enum": {
+                    "keywords": [],
+                    "children": []
+                  }
+                }
+              ]
+            }
+          },
+          {
+            "向enum中添加新方法": {
+              "keywords": [],
+              "children": [
+                {
+                  "覆盖enum的方法": {
+                    "keywords": [],
+                    "children": []
+                  }
+                }
+              ]
+            }
+          },
+          {
+            "switch语句中的enum": {
+              "keywords": [],
+              "children": []
+            }
+          },
+          {
+            "values（）的神秘之处": {
+              "keywords": [],
+              "children": []
+            }
+          },
+          {
+            "实现但不继承随机选取": {
+              "keywords": [],
+              "children": []
+            }
+          },
+          {
+            "为组织而使用接口": {
+              "keywords": [],
+              "children": []
+            }
+          },
+          {
+            "使用EnumSet替代标志": {
+              "keywords": [],
+              "children": []
+            }
+          },
+          {
+            "使用EnumMap": {
+              "keywords": [],
+              "children": []
+            }
+          },
+          {
+            "常数相关的方法": {
+              "keywords": [],
+              "children": [
+                {
+                  "使用enum的职责链": {
+                    "keywords": [],
+                    "children": []
+                  }
+                },
+                {
+                  "使用enum的状态机": {
+                    "keywords": [],
+                    "children": []
+                  }
+                }
+              ]
+            }
+          },
+          {
+            "多路分发": {
+              "keywords": [],
+              "children": [
+                {
+                  "使用enum分发": {
+                    "keywords": [],
+                    "children": []
+                  }
+                },
+                {
+                  "使用EnumMap分发": {
+                    "keywords": [],
+                    "children": []
+                  }
+                }
+              ]
+            }
+          },
+          {
+            "使用枚举类型设置常量": {
+              "keywords": [],
+              "children": []
+            }
+          },
+          {
+            "使用枚举类型的优势": {
+              "keywords": [],
+              "children": []
+            }
+          }
+        ]
+      }
+    },
+    {
+      "类初始化块": {
+        "keywords": [],
+        "children": []
+      }
+    },
+    {
+      "Java访问权限修饰词": {
+        "keywords": [],
+        "children": [
+          {
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