From 3a9a5988eb99019e53809e22a09abdfceca6faa3 Mon Sep 17 00:00:00 2001
From: xuxin <840198532@qq.com>
Date: Sun, 19 Apr 2026 15:50:14 +0800
Subject: [PATCH] =?UTF-8?q?day02-=E6=95=B0=E6=8D=AE=E7=B1=BB=E5=9E=8B?=
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---
 day02/src/com/inmind/type_cast01/Demo01.java | 34 ++++++++++++++++++++
 day02/src/com/inmind/type_cast01/Demo02.java | 21 ++++++++++++
 2 files changed, 55 insertions(+)
 create mode 100644 day02/src/com/inmind/type_cast01/Demo01.java
 create mode 100644 day02/src/com/inmind/type_cast01/Demo02.java

diff --git a/day02/src/com/inmind/type_cast01/Demo01.java b/day02/src/com/inmind/type_cast01/Demo01.java
new file mode 100644
index 0000000..78b670f
--- /dev/null
+++ b/day02/src/com/inmind/type_cast01/Demo01.java
@@ -0,0 +1,34 @@
+package com.inmind.type_cast01;
+/*
+
+Java程序中要求参与的计算的数据，必须要保证数据类型的一致性，如果数据类型不一致将发生类型的转换
+
+数据类型转换---自动转换
+自动转换：将取值范围小的类型(byte)自动提升为取值范围大的类型(int)
+---------------------------------------------
+转换顺序:byte、short、char---->int---->long---->float---->double
+ */
+public class Demo01 {
+    public static void main(String[] args) {
+        //定义一个整数
+        int a = 10;
+        int b = 20;
+        //计算两个变量的和
+        int c = a+b;
+
+        //定义字节类型
+        byte b1 = 2;
+        int result =  b+b1;//发生了自动类型转换，b1自动提升为int
+        System.out.println(result);//22
+        //-------------------------------------------------------
+        byte b3 = 10;
+        byte b4 = 20;
+        //byte val = b3+b4;//错误，因为byte+byte，结果会超出byte的范围，在java中，byte，short，char进行运算，都会先提升为int来计算
+        int val = b3+b4;
+        System.out.println(val);
+        //-----------------------------------------
+        int s = b3+b4;
+        System.out.println(s);
+
+    }
+}
diff --git a/day02/src/com/inmind/type_cast01/Demo02.java b/day02/src/com/inmind/type_cast01/Demo02.java
new file mode 100644
index 0000000..e9b1dd2
--- /dev/null
+++ b/day02/src/com/inmind/type_cast01/Demo02.java
@@ -0,0 +1,21 @@
+package com.inmind.type_cast01;
+/*
+自动转换的举例和顺序
+
+转换顺序:byte、short、char---->int---->long---->float---->double
+ */
+public class Demo02 {
+    public static void main(String[] args) {
+        byte b = 10;
+        short s = b;//只要是byte，short，char进行运算，必定先提升为int计算
+        char c = 'a';
+        int a = c;
+        int i = s;//自动类型提升
+
+        long l = i;
+
+        float f = l;
+        double d = f;
+
+    }
+}