diff --git a/day08/src/com/inmind/math04/Demo15.java b/day08/src/com/inmind/math04/Demo15.java
index 31d07e2..1d79a27 100644
--- a/day08/src/com/inmind/math04/Demo15.java
+++ b/day08/src/com/inmind/math04/Demo15.java
@@ -13,4 +13,21 @@ public static double floor(double a) ：返回小于等于参数最大的整数
 public static long round(double a) ：返回最接近参数的 long。(相当于四舍五入方法)
  */
 public class Demo15 {
+    public static void main(String[] args) {
+        //取值范围： -10.8 ~5.9
+        double start = -10.8;
+        double end = 5.9;
+        //定义计数的变量
+        int count = 0;
+
+        for (double i = Math.ceil(start); i < end; i++) {
+            //判断条件：绝对值>6||<2.1
+            if (Math.abs(i) > 6 || Math.abs(i) < 2.1) {
+                System.out.println(i);
+                count++;
+            }
+        }
+        System.out.println("满足条件的个数："+count);
+
+    }
 }