diff --git "a/11 \351\202\271\344\272\250\344\274\237/20221221\344\275\234\344\270\232.md" "b/11 \351\202\271\344\272\250\344\274\237/20221221\344\275\234\344\270\232.md"
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index 0000000000000000000000000000000000000000..46d04332bc7b2ba63c8606504a0abeb6ab57ffc4
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+++ "b/11 \351\202\271\344\272\250\344\274\237/20221221\344\275\234\344\270\232.md"	
@@ -0,0 +1,59 @@
+# 作业
+
+编写函数，计算圆的面积和周长，在主函数中接受圆的半径，在自定义函数中计算并输出
+
+```java
+import java.util.Scanner;
+
+public class J1 {
+    public static void main(String[] args) {
+        Scanner Sc = new Scanner(System.in);
+        System.out.println("输入圆的半径");
+        int a= Sc.nextInt();
+        double r = 3.14;
+        mianji(a,r);
+        zouchang(a,r);
+    }
+    public static void mianji(int a,double r){
+        System.out.println(r*a*a);
+    }
+    public static void zouchang(int a,double r){
+        System.out.println(r*a*2);
+    }
+}
+```
+
+在主函数中产生20个0-10之间的随机数，将这20个随机数存入数组，并通过函数计算某个数在这些随机数中出现的次数（这“某个数”是在主函数中由用户输入的）
+
+```java
+import java.util.Random;
+import java.util.Scanner;
+
+public class J2 {
+    public static void main(String[] args) {
+        long[] a = new long[20];
+        for (int i = 0; i < 20;i++){
+            Random random=new Random();
+            int b =random.nextInt(10)+11;
+            System.out.println(a+"");
+            Scanner Sc = new Scanner(System.in);
+            System.out.println("请输入某个数");
+            long x =Sc.nextLong();
+            cisum(a,x);
+        }
+    }
+    public static void cisum(long[] a,long x){
+        int count =0;
+        for (int i=0; i<a.length;i++){
+            if (x==a[i]){
+                count++;
+            }
+
+        }
+        System.out.println("次数："+count);
+    }
+}
+```
+
+脑子不够用
+