diff --git "a/31 \346\235\216\346\254\243/20221221 \344\272\214\347\273\264\346\225\260\347\273\204.md" "b/31 \346\235\216\346\254\243/20221221 \344\272\214\347\273\264\346\225\260\347\273\204.md"
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index 0000000000000000000000000000000000000000..d73396ff4d7e05825364f0f5f3e5bdd1943c591d
--- /dev/null
+++ "b/31 \346\235\216\346\254\243/20221221 \344\272\214\347\273\264\346\225\260\347\273\204.md"	
@@ -0,0 +1,22 @@
+## 二维数组
+
+#### 格式：
+
+```java
+int[][] name = {
+    {元素1,元素4,...},
+    {元素2,...},
+    {元素3,...}
+    ...
+};
+//name[i]为第一层数组，返回的是每个里层数组的地址
+System.out.println(int[0][0]);//元素1
+System.out.println(int[0][1]);//元素4
+System.out.println(int[1][0]);//元素1
+```
+
+#### 遍历：
+
+<img src="20221221 二维数组/2022-12-22_051545.png" alt="2022-12-22_051545"  />
+
+![2022-12-22_051557](20221221 二维数组/2022-12-22_051557.png)
\ No newline at end of file
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diff --git "a/31 \346\235\216\346\254\243/20221221 \345\255\246\347\224\237\347\256\241\347\220\206\347\263\273\347\273\237.md" "b/31 \346\235\216\346\254\243/20221221 \345\255\246\347\224\237\347\256\241\347\220\206\347\263\273\347\273\237.md"
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@@ -0,0 +1,58 @@
+```java
+import java.util.Scanner;
+
+public class text5 {
+    public static void main(String[] args) {
+        start();
+    }
+    public static void start(){
+        System.out.println("=================================="+
+                "\n-      欢迎使用3班学生管理系统        -"+
+                "\n- \t\t1.浏览所有学生消息\t\t\t-"+
+                "\n- \t\t2.添加学生信息\t\t\t-"+
+                "\n- \t\t3.修改学生信息\t\t\t-"+
+                "\n- \t\t4.删除学生信息\t\t\t-"+
+                "\n- \t\t5.查询学生信息\t\t\t-"+
+                "\n==================================");
+        String[] stu = new String[10];
+        stu[0] = "某一";
+        stu[1] = "某二";
+        Scanner sc = new Scanner(System.in);
+        String choose = sc.next();
+        switch (choose){
+            case "1":
+                break;
+            case "2":
+                lookFor(stu);
+                break;
+            case "3":
+                break;
+            case "4":
+                break;
+            case "5":
+                break;
+            default:
+                System.out.println("输入错误，请重新输入");
+        }
+    }
+    public static void getAdd(){
+        Scanner sc = new Scanner(System.in);
+        System.out.println("请输入学生号数：");
+        String num = sc.next();
+        System.out.println("请输入学生姓名：");
+        String studentName = sc.next();
+
+    }
+    public static void lookFor(String[] stu){
+        for (String name:stu){
+            if (name!=null){
+                System.out.println(name+"\t");
+            } else {
+                System.out.println("查无此人，请添加信息");
+            }
+
+        }
+    }
+}
+```
+
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