diff --git a/keshe/keshe.iml b/keshe/keshe.iml
new file mode 100644
index 0000000000000000000000000000000000000000..9465dd864f0bbf5233af344982a638534a50275d
--- /dev/null
+++ b/keshe/keshe.iml
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>
\ No newline at end of file
diff --git a/keshe/out/output.txt b/keshe/out/output.txt
new file mode 100644
index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
diff --git a/keshe/src/FileIo.java b/keshe/src/FileIo.java
new file mode 100644
index 0000000000000000000000000000000000000000..afd8c1f13d63900d6a91da55df1113a45c63e6a0
--- /dev/null
+++ b/keshe/src/FileIo.java
@@ -0,0 +1,34 @@
+import java.io.*;
+import java.nio.charset.StandardCharsets;
+import java.util.ArrayList;
+
+class FileIO {
+    public static void read(ArrayList<Source> sources) throws IOException {
+        // 防止文件建立或读取失败，用catch捕捉错误并打印，也可以throw
+            /* 读入TXT文件 */
+            FileReader fr = new FileReader("d:/naoki/output.txt");
+            BufferedReader br = new BufferedReader(fr); // 建立一个对象，它把文件内容转成计算机能读懂的语言
+            String line = null;
+            while ((line = br.readLine()) != null) {
+                System.out.println(line);
+            }
+            br.close();
+
+        }
+
+    public static void write(ArrayList<Source> sources){
+        try {
+            /* 写入Txt文件 */
+            File writename = new File("output.txt"); // 相对路径，如果没有则要建立一个新的output。txt文件
+            writename.createNewFile(); // 创建新文件
+            BufferedWriter out = new BufferedWriter(new FileWriter(writename));
+            for(Source sc:sources){
+                out.write(sc.toString()+"\r\n"); // \r\n即为换行
+            }
+            out.flush(); // 把缓存区内容压入文件
+            out.close(); // 最后记得关闭文件
+        }catch (Exception e){
+            e.printStackTrace();
+        }
+    }
+}
\ No newline at end of file
diff --git a/keshe/src/Main.java b/keshe/src/Main.java
new file mode 100644
index 0000000000000000000000000000000000000000..01e0b25b6f0038e239cbe9fe2b00ff0337766adb
--- /dev/null
+++ b/keshe/src/Main.java
@@ -0,0 +1,4 @@
+public class Main {
+    public static void main(String[] args) {
+    }
+}
\ No newline at end of file
diff --git a/keshe/src/Menu.java b/keshe/src/Menu.java
new file mode 100644
index 0000000000000000000000000000000000000000..c8b7fc193cd89058b7bcebbbd03f965572ac5ee1
--- /dev/null
+++ b/keshe/src/Menu.java
@@ -0,0 +1,128 @@
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Scanner;
+//import static FileOperation;
+
+
+//javac -encoding UTF-8 xxx.java
+class Menu {
+    private static ArrayList<Source> sources = new ArrayList<>();
+    public static void main(String[] args) throws IOException {
+        Scanner in = new Scanner(System.in);
+        int choice;//选项
+        while (true) {
+            showMenu();
+            try {
+                choice = in.nextInt();
+                switch (choice) {
+                    case 1:
+                        try {
+                            sources.add(newSource());
+                            System.out.println("添加成功");
+                        } catch (Exception e) {
+                            System.out.println("添加失败。。等下重试");
+                        }
+                        break;
+                    case 2:
+                        System.out.println("课程列表如下：");
+                        readSource();
+                        break;
+                    case 3:
+                        querySource();
+                        break;
+                    case 4:
+                        saveSource();
+                        break;
+                    default:
+                        System.out.println("输入有误，请重试");
+                        break;
+                }
+            } catch (Exception e) {
+                System.out.println("输入有误，请重试");
+            }
+        }
+    }
+
+    public static void showMenu() {
+        System.out.println();
+        System.out.println();
+        System.out.println("=====================");
+        System.out.println("=欢迎使用课程选修系统=");
+        System.out.println("=1.     添加课程    =");
+        System.out.println("=2.   显示所有课程  =");
+        System.out.println("=3.     查询课程    =");
+        System.out.println("=4.     保存课程    =");
+        System.out.println("=====================");
+        System.out.println("输入你的选择:");
+    }
+
+    private static Source newSource() {
+        /*
+         * 课程
+         *  课程编号，课程名称，
+         课程性质(公共课、必修课、选修课)，总学时，授课学时，
+         实验或上机学时，学分，开课学期等信息
+         **/
+        Scanner in = new Scanner(System.in);
+        String sNo;//uuid
+        String sName;
+        String sXingzhi;
+        int sShouke;
+        int sShiyan;
+        double sXuefen;
+        String sXueqi;
+
+        sNo=Utils.uuid();
+        System.out.println("输入课程名称:");
+        sName=in.next();
+        System.out.println("输入课程性质(1--选修，2--必修):");
+        sXingzhi=in.next();
+        System.out.println("输入授课学时(数字):");
+        sShouke=in.nextInt();
+        System.out.println("输入实验学时(数字):");
+        sShiyan=in.nextInt();
+        System.out.println("输入学分:");
+        sXuefen=in.nextDouble();
+        System.out.println("输入开课学期:");
+        sXueqi=in.next();
+
+        return new Source(sNo,sName,sXingzhi,sShouke,sShiyan,sXuefen,sXueqi);
+
+    }
+
+    private static void querySource() throws IOException {
+        System.out.println("请输入查询类别：");
+        System.out.println("1---按照学分查询");
+        System.out.println("2---按照课程性质查询");
+        Scanner in = new Scanner(System.in);
+        int choice = in.nextInt();
+        double key;
+        if (choice == 1) {
+            System.out.println("输入学分:");
+            key = in.nextDouble();
+            for (Source sc : sources) {
+                if (sc.getsXuefen() == key) {
+                    System.out.println(sc);
+                }
+            }
+        } else if (choice == 2) {
+            System.out.println("输入查询课程性质(1--选修，2--必修):");
+            String xingzhi = in.next();
+            for (Source sc : sources) {
+                if (sc.getsXingzhi().equals(xingzhi)) {
+                    System.out.println(sc);
+                }
+            }
+        } else {
+            System.out.println("输入有误");
+        }
+    }
+    private static void readSource() throws IOException {
+        FileIO.read(sources);
+    }
+    private static void saveSource(){
+        FileIO.write(sources);
+        System.out.println("写入成功");
+    }
+}
+
diff --git a/keshe/src/Source.java b/keshe/src/Source.java
new file mode 100644
index 0000000000000000000000000000000000000000..4c74c4bdeb605705466342180e64313b2661eba3
--- /dev/null
+++ b/keshe/src/Source.java
@@ -0,0 +1,102 @@
+/**
+ * 课程
+ *  课程编号，课程名称，
+ 课程性质(公共课、必修课、选修课)，总学时，授课学时
+ */
+public class Source  {
+    private String sNo;//uuid
+    private String sName;
+    private String sXingzhi;
+    //private int sZongxueshi;总学时=授课+实验
+    private int sShouke;
+    private int sShiyan;
+    private double sXuefen;
+    private String sXueqi;
+
+    public String getsNo() {
+
+        return sNo;
+    }
+
+    public void setsNo(String sNo) {
+
+        this.sNo = sNo;
+    }
+
+    public String getsName() {
+
+        return sName;
+    }
+
+    public void setsName(String sName) {
+
+        this.sName = sName;
+    }
+
+    public String getsXingzhi() {
+
+        return sXingzhi;
+    }
+
+    public void setsXingzhi(String sXingzhi) {
+        this.sXingzhi = sXingzhi;
+    }
+
+    public int getsShouke() {
+        return sShouke;
+    }
+
+    public void setsShouke(int sShouke) {
+        this.sShouke = sShouke;
+    }
+
+    public int getsShiyan() {
+        return sShiyan;
+    }
+
+    public void setsShiyan(int sShiyan) {
+        this.sShiyan = sShiyan;
+    }
+
+    public double getsXuefen() {
+        return sXuefen;
+    }
+
+    public void setsXuefen(double sXuefen) {
+        this.sXuefen = sXuefen;
+    }
+
+    public String getsXueqi() {
+        return sXueqi;
+    }
+
+    public void setsXueqi(String sXueqi) {
+        this.sXueqi = sXueqi;
+    }
+
+    public Source(String sNo, String sName, String sXingzhi, int sShouke, int sShiyan, double sXuefen, String sXueqi) {
+        this.sNo = sNo;
+        this.sName = sName;
+        this.sXingzhi = sXingzhi;
+        this.sShouke = sShouke;
+        this.sShiyan = sShiyan;
+        this.sXuefen = sXuefen;
+        this.sXueqi = sXueqi;
+    }
+
+    public Source() {
+    }
+
+    @Override
+    public String toString() {
+        return "课程{" +
+                "编号='" + sNo + '\'' +
+                ", 课程名='" + sName + '\'' +
+                ", 课程性质='" + sXingzhi + '\'' +
+                ", 授课学时=" + sShouke +
+                ", 实验学时=" + sShiyan +
+                ", 学分=" + sXuefen +
+                ", 开课学期='" + sXueqi + '\'' +
+                '}';
+    }
+}
diff --git a/keshe/src/Utils.java b/keshe/src/Utils.java
new file mode 100644
index 0000000000000000000000000000000000000000..c6a11feac9547d87c458806d1d8289cf190e90b4
--- /dev/null
+++ b/keshe/src/Utils.java
@@ -0,0 +1,18 @@
+import java.util.UUID;
+
+public class Utils {
+    /*
+        设置UUid
+    */
+    public static String uuid(){
+        String uuid= UUID.randomUUID().toString();
+        char[] cs=new char[32];
+        int j=0;
+        for(int i=uuid.length();i-->0;){
+            if(uuid.charAt(i)!='-'){
+                cs[j++]=uuid.charAt(i);
+            }
+        }
+        return new String(cs);
+    }
+}