From 312a9207b19b6b5fe7bc9a57a14276d0bb7342de Mon Sep 17 00:00:00 2001
From: xuxin <840198532@qq.com>
Date: Tue, 15 Sep 2026 10:34:56 +0800
Subject: [PATCH] =?UTF-8?q?day02--=E6=95=B0=E6=8D=AE=E7=B1=BB=E5=9E=8B?=
 =?UTF-8?q?=E8=BD=AC=E6=8D=A2=5F=E8=87=AA=E5=8A=A8=E8=BD=AC=E6=8D=A2?=
 =?UTF-8?q?=E7=9A=84=E4=B8=BE=E4=BE=8B=E5=92=8C=E9=A1=BA=E5=BA=8F?=
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---
 day02/src/com/inmind/Demo02.java | 23 +++++++++++++++++++++++
 1 file changed, 23 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..2e9b7b9
--- /dev/null
+++ b/day02/src/com/inmind/Demo02.java
@@ -0,0 +1,23 @@
+package com.inmind;
+/*
+自动转换：将取值范围小的类型自动提升为取值范围大的类型 。
+数据类型转换---自动转换中转换顺序
+
+转换顺序:byte、short、char---->int---->long---->float---->double
+
+强调：byte、short、char 在运算都是直接提升至int
+*/
+public class Demo02 {
+    public static void main(String[] args) {
+        byte b1 = 127;
+        short s = b1;
+        int i = b1+s;
+        long l = i + s;
+        float f = l+i;
+        double d = f+l;
+        System.out.println("---------------------------------");
+        byte t1 = 10;
+        byte t2 = 20;
+        //short s1 = t1+t2;//注意：byte、short、char 在运算都是直接提升至int
+    }
+}