diff --git "a/37 \347\216\213\346\231\264/2022.12.22\345\255\246\347\224\237\347\256\241\347\220\206\347\263\273\347\273\237\345\256\214\345\226\204.md" "b/37 \347\216\213\346\231\264/2022.12.22\345\255\246\347\224\237\347\256\241\347\220\206\347\263\273\347\273\237\345\256\214\345\226\204.md"
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@@ -0,0 +1,167 @@
+## 学生管理系统完善
+
+```java
+import java.util.Scanner;
+
+public class StudentSystem {
+    static Scanner sc = new Scanner(System.in);
+    static   String[] stu = new String[46];
+    public static void main(String[] args) {
+
+
+        stu[0] = "苏";
+        stu[1] = "王";
+        stu[2] =  "徐";
+        stu[3] =  "李";
+        stu[4] = "刘";
+
+        aa: while (true){
+            Welcome();
+          int a =  choice(sc.nextInt());
+          if (a==1){
+              break ;//中止while
+          }
+        }
+
+    }
+    //静态方法只能用static修饰。（静态对象或静态方法）
+
+    //欢迎界面
+    public static void Welcome() {
+        System.out.println(
+                "\n============================" +
+                        "\n-         欢迎使用3班学生管理系统   --" +
+                        "\n-      1.浏览所有学生信息    -" +
+                        "\n-      2.添加学生信息       -" +
+                        "\n-      3.修改学生信息       -" +
+                        "\n-      4.删除学生信息       -" +
+                        "\n-      5.查询学生信息       -" +
+                        "\n-      6.退出管理系统       -" +
+                        "\n =========================" +
+                        "\n请输入对应的数字选择你需要的功能：");
+    }
+    //菜单选择
+    public static int choice(int num){
+        int a =0;
+        switch (num) {
+            case 1:
+                //浏览
+                Allstudent();
+                break;
+            case 2:
+                //添加
+                addstudent();
+                break;
+            case 3:
+                //修改
+                editStudent();
+                break;
+            case 4:
+                //删除
+                deleteStudent();
+                break;
+            case 5:
+                //查询
+                searchStudent();
+                break;
+            case 6:
+                //结束
+                System.out.println("你选择了退出系统");
+
+            default:
+                System.out.println("你输入的选项错误");
+                a=1;
+        }
+        return a;
+    }
+      //删除学生信息
+    private static void deleteStudent() {
+        System.out.println("请问你要删除哪个学生");
+        String name= sc.next();
+        int index =search(name);
+        if (index==-1){
+            System.out.println("对不起，没有该学生，无法删除");
+        }else {
+            stu[index]=null;
+            System.out.println("删除成功");
+        }
+    }
+       //查找学生
+    public static void searchStudent(){
+        System.out.println("请输入要查找的学生姓名");
+        String name =sc.next();
+        int index =search(name);
+        if (index==-1){
+            System.out.println("对不起，没有该学生");
+        }else {
+            System.out.println("恭喜，找到了，Ta在第"+(index+1)+"个");
+        }
+    }
+    //修改
+    private static void editStudent(){
+        System.out.println("请问你要修改那个学生");
+        String  name =sc.next();
+        int index =search(name);
+        if (index==-1){
+            System.out.println("对不起，没有该学生，无法修改");
+        }else {
+            System.out.println("请问你要把【"+name+"】修改为谁：");
+            String newNmae = sc.next();
+            stu[index]= newNmae;
+            System.out.println("修改成功！");
+        }
+    }
+     //浏览
+    public static void Allstudent() {
+        System.out.println("3班学生如下：");
+        int count =0;
+        for (String name : stu) {
+            if (name==null){
+                count++;
+                continue;
+            }
+            System.out.println(name + "\t");
+        }
+        if (count== stu.length){
+            System.out.println("目前还没有学生信息");
+        }
+    }
+     // 添加
+    public static void addstudent() {
+        System.out.println("请输入你要添加的学生");
+        String name = sc.next();
+        int index = search( name);
+        if (index != -1) {
+            System.out.println("该学生已经在数据库了，请不要重复添加");
+        } else {
+            int nullIndex = search(null);
+            stu[nullIndex] = name;
+            System.out.println("添加成功");
+            Allstudent();
+
+        }
+    }
+
+    public static int search(   String str) {
+        int index = -1;
+        if (str == null) {
+            for (int i = 0; i < stu.length; i++) {
+                if (stu[i]==null){
+                    index = i;
+                    break;
+                }
+        }
+    }else {
+            for (int i = 0; i < stu.length; i++) {
+                if (str.equals(stu[i])) {
+                    index=i;
+                    return index;
+                }
+            }
+        }
+            return index;
+        }
+
+}
+```
+