From 1f684aebcb7d10b1b3a309ecc7451e1baa8b6c0d Mon Sep 17 00:00:00 2001
From: xuxin <840198532@qq.com>
Date: Tue, 23 Dec 2025 15:25:13 +0800
Subject: [PATCH] =?UTF-8?q?java=E4=B8=AD=E7=9A=84=E8=87=AA=E5=8A=A8?=
 =?UTF-8?q?=E6=8F=90=E5=8D=87=E8=A7=84=E5=88=99?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 day02/src/com/inmind/Demo02.java | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
 create mode 100644 day02/src/com/inmind/Demo02.java

diff --git a/day02/src/com/inmind/Demo02.java b/day02/src/com/inmind/Demo02.java
new file mode 100644
index 0000000..834767d
--- /dev/null
+++ b/day02/src/com/inmind/Demo02.java
@@ -0,0 +1,18 @@
+package com.inmind;
+/*
+自动类型转换规则
+范围小的类型向范围大的类型提升，byte、short、char 运算时直接提升为int 。
+自动提升规则：
+byte、short、char-->int-->long-->float-->double
+
+注意：当java的不同类型进行计算时，自动先提升为大范围的类型！！！！！
+ */
+public class Demo02 {
+    public static void main(String[] args) {
+        //定义一个double型的变量
+        double d = 3.5;
+        float b = 100;
+        double sum = b+d;
+        System.out.println(sum);
+    }
+}