diff --git "a/18 \345\276\220\346\260\270\346\267\263/202212011 java\347\254\254\344\272\214\346\254\241\346\225\260\347\273\204.md" "b/18 \345\276\220\346\260\270\346\267\263/20221211 java\347\254\254\344\272\214\346\254\241\346\225\260\347\273\204.md"
similarity index 100%
rename from "18 \345\276\220\346\260\270\346\267\263/202212011 java\347\254\254\344\272\214\346\254\241\346\225\260\347\273\204.md"
rename to "18 \345\276\220\346\260\270\346\267\263/20221211 java\347\254\254\344\272\214\346\254\241\346\225\260\347\273\204.md"
diff --git "a/18 \345\276\220\346\260\270\346\267\263/20221215 java\345\244\215\344\271\240.md" "b/18 \345\276\220\346\260\270\346\267\263/20221215 java\345\244\215\344\271\240.md"
new file mode 100644
index 0000000000000000000000000000000000000000..8eaa9f2ed6c6c99596b6b34a3dd45610bc1791ed
--- /dev/null
+++ "b/18 \345\276\220\346\260\270\346\267\263/20221215 java\345\244\215\344\271\240.md"	
@@ -0,0 +1,31 @@
+作业
+
+输入倒叙乘法口诀表
+
+```java
+public class aasd {
+    public static void main(String[] args) {
+        for (int i = 9; i >=1 ; i--) {
+            for (int j =  i; j >=1; j--) {
+                System.out.print(  i+ "*" +j + "=" + i * j + "\t");
+            }
+            System.out.println();
+        }
+    }
+}
+```
+
+100立方燃气 第二阶梯240~360 4.05元 第三阶梯360~999999 5.06元 求第二阶梯和第三阶梯分别所占的燃气
+
+```java
+public class fgdg {
+    public static void main(String[] args) {
+        for (int x=1;x<=100;x++){
+            if (x*4.05+(100-x)*5.06==445.4){
+                System.out.println(x+"立方");
+                System.out.println((100-x)+"立方");
+            }
+        }
+    }
+}
+```
\ No newline at end of file
diff --git "a/18 \345\276\220\346\260\270\346\267\263/20221218 java\346\226\271\346\263\225.md" "b/18 \345\276\220\346\260\270\346\267\263/20221218 java\346\226\271\346\263\225.md"
new file mode 100644
index 0000000000000000000000000000000000000000..535746a91ae19b13985ec111d0341f28a5983b49
--- /dev/null
+++ "b/18 \345\276\220\346\260\270\346\267\263/20221218 java\346\226\271\346\263\225.md"	
@@ -0,0 +1,47 @@
+方法
+
+return 返回值
+
+void 不返回函数
+
+作业
+
+3. 定义一函数，用于求2个数中的较大数，并将其返回，这2个数字在主函数中由用户输入
+
+```java
+import java.util.Scanner;
+
+public class rew {
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+        System.out.println("输入两个数");
+        sd(sc.nextDouble(), sc.nextDouble());
+    }
+
+    public static void sd(double a,double b) {
+       if (a>b){
+           System.out.println("这个数比较大"+a);
+       }else {
+           System.out.println("这个数比较大"+b);
+       }
+    }
+}
+```
+
+4. 在主函数中从键盘接收X, Y , Z3个数，编写函数计算这3个数的立方和并返回计算结果：S=X3+Y3+Z3
+
+```java
+import java.util.Scanner;
+
+public class ret {
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+        System.out.println("输入三个数");
+        double sum= af(sc.nextDouble(), sc.nextDouble(), sc.nextDouble());
+        System.out.println(sum);
+    }
+    public static double af(double x,double y,double z){
+        return x*3+y*3+z*3;
+    }
+}
+```
\ No newline at end of file