From b8aff9d0c66d860f1bb7fe21ace1c301eb23d743 Mon Sep 17 00:00:00 2001
From: xuxin <840198532@qq.com>
Date: Thu, 22 Jan 2026 11:15:18 +0800
Subject: [PATCH] =?UTF-8?q?day08-static=E5=BA=94=E7=94=A8-Math=E7=B1=BB-?=
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---
 day08/src/com/inmind/math04/Demo15.java | 26 +++++++++++++++++++++++++
 day08/src/com/inmind/math04/Test16.java | 10 ++++++++++
 2 files changed, 36 insertions(+)
 create mode 100644 day08/src/com/inmind/math04/Demo15.java
 create mode 100644 day08/src/com/inmind/math04/Test16.java

diff --git a/day08/src/com/inmind/math04/Demo15.java b/day08/src/com/inmind/math04/Demo15.java
new file mode 100644
index 0000000..c783006
--- /dev/null
+++ b/day08/src/com/inmind/math04/Demo15.java
@@ -0,0 +1,26 @@
+package com.inmind.math04;
+/*
+Math工具类的使用
+public static double abs(double a) ：返回 double 值的绝对值。
+public static double ceil(double a) ：返回大于等于参数的最小的整数。(向上取整)
+public static double floor(double a) ：返回小于等于参数最大的整数。(向下取整)
+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) {
+        //public static double abs(double a) ：返回 double 值的绝对值。
+        System.out.println(Math.abs(-2));//2
+        System.out.println(Math.abs(-2.2));//2.2
+        //public static double ceil(double a) ：返回大于等于参数的最小的整数。(向上取整)
+        System.out.println(Math.ceil(6.1));//7.0
+        System.out.println(Math.ceil(-3.6));//-3.0
+        //public static double floor(double a) ：返回小于等于参数最大的整数。（向下取整）
+        System.out.println(Math.floor(4.9));//4.0;
+        System.out.println(Math.floor(-6.6));//-7.0
+        //public static long round(double a) ：返回最接近参数的 long。(相当于四舍五入方法)
+        System.out.println(Math.round(3.4));//3
+        System.out.println(Math.round(4.6));//5
+        System.out.println(Math.round(-8.8));//-9
+
+    }
+}
diff --git a/day08/src/com/inmind/math04/Test16.java b/day08/src/com/inmind/math04/Test16.java
new file mode 100644
index 0000000..b7e8457
--- /dev/null
+++ b/day08/src/com/inmind/math04/Test16.java
@@ -0,0 +1,10 @@
+package com.inmind.math04;
+/*
+计算在 -10.8 到5.9 之间，绝对值大于6 或者小于2.1 的整数有多少个？
+分析：
+取值范围： -10.8 ~5.9
+条件>6||<2.1
+定义一个变量来计数
+ */
+public class Test16 {
+}