diff --git "a/02 \346\236\227\344\275\263\346\263\275/20221220 \344\275\234\344\270\232.md" "b/02 \346\236\227\344\275\263\346\263\275/20221220 \344\275\234\344\270\232.md"
new file mode 100644
index 0000000000000000000000000000000000000000..a20e4ecf2a5484c542a194ff27b7d221363e1ef5
--- /dev/null
+++ "b/02 \346\236\227\344\275\263\346\263\275/20221220 \344\275\234\344\270\232.md"	
@@ -0,0 +1,139 @@
+学生管理系统
+
+```java
+import java.util.Scanner;
+
+public class a {
+    public static void main(String[] args) {
+        System.out.println("=============================");
+        System.out.println("-     欢迎使用牛马学生管理系统\t-");
+        System.out.println("-   \t1.浏览所有学生信息\t\t-");
+        System.out.println("-   \t2.添加学生信息\t\t-");
+        System.out.println("-   \t3.修改学生信息\t\t-");
+        System.out.println("-   \t4.删除学生信息\t\t-");
+        System.out.println("-   \t5.查询学生信息\t\t-");
+        System.out.println("-   \t6.退出管理系统\t\t-");
+        System.out.println("=============================");
+        Scanner s = new Scanner(System.in);
+        String[] arr = new String[50];
+        int index = 0;
+        a:
+        for (; ; ) {
+            System.out.println("请输入你需要的功能：");
+            int get = s.nextInt();
+            switch (get) {
+                case 1:
+                    liulan(arr);
+                    break;
+                case 2:
+                    System.out.println("请输入学生姓名：");
+                    String tname = s.next();
+                    tianjia(arr, tname);
+                    break;
+                case 3:
+                    System.out.println("请输入要修改的学生姓名：");
+                    String xname1 = s.next();
+                    if (x(arr,xname1)==0){
+                        System.out.println("请输入新的姓名：");
+                        String xname2 = s.next();
+                        xiugai(arr, xname1, xname2);
+                    }else{
+                        System.out.println("此人不在名单上！");
+                    }
+                    break;
+                case 4:
+                    System.out.println("请输入要删除的学生姓名：");
+                    String sname = s.next();
+                    shanchu(arr, sname);
+                    break;
+                case 5:
+                    System.out.println("请输入要查询的学生姓名：");
+                    String cname = s.next();
+                    chaxun(arr, cname);
+                    break;
+                case 6:
+                    System.out.println("已为您退出系统！");
+                    break a;
+                default:
+                    System.out.println("暂无此功能，请重新输入！");
+            }
+        }
+    }
+
+    public static void liulan(String[] arr) {
+        System.out.println("已录入学生名单如下：");
+        for (int i = 0; i < arr.length; i++) {
+            if (arr[i] != null) {
+                System.out.println(arr[i]);
+            }
+        }
+    }
+
+    public static void tianjia(String[] arr, String name) {
+        for (int i = 0; i < arr.length; i++) {
+            if (arr[i] != null) {
+                if (arr[i].equals(name)) {
+                    System.out.println("该学生已录入！");
+                    break;
+                }
+            } else {
+                arr[i] = name;
+                System.out.println("添加成功！");
+                break;
+            }
+        }
+    }
+
+    public static int x(String[] arr, String name) {
+        boolean f = false;
+        for (int i = 0; i < arr.length; i++) {
+            if (arr[i] != null) {
+                if (arr[i].equals(name)) {
+                    f = true;
+                }
+            }
+        }
+        if (f) {
+            return 0;
+        } else {
+            return 1;
+        }
+    }
+
+    public static void shanchu(String[] arr, String name) {
+        for (int i = 0; i < arr.length; i++) {
+            if (arr[i].equals(name)) {
+                arr[i] = null;
+                System.out.println("删除成功！");
+                break;
+            }
+        }
+    }
+
+    public static void xiugai(String[] arr, String name1, String name2) {
+        for (int i = 0; i < arr.length; i++) {
+            if (name1.equals(arr[i])) {
+                arr[i] = name2;
+            }
+        }
+    }
+
+
+    public static void chaxun(String[] arr, String name) {
+        boolean f = false;
+        for (int i = 0; i < arr.length; i++) {
+            if (arr[i] != null) {
+                if (arr[i].equals(name)) {
+                    f = true;
+                }
+            }
+        }
+        if (f) {
+            System.out.println("此人在名单上！");
+        } else {
+            System.out.println("查无此人！");
+        }
+    }
+}
+```
+