From a84516810810e14bb31d17969acc7e67643a184a Mon Sep 17 00:00:00 2001
From: xuxin <840198532@qq.com>
Date: Wed, 24 Dec 2025 10:22:32 +0800
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---
 day02/src/com/inmind/Demo06.java | 51 ++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 day02/src/com/inmind/Demo06.java

diff --git a/day02/src/com/inmind/Demo06.java b/day02/src/com/inmind/Demo06.java
new file mode 100644
index 0000000..863df0e
--- /dev/null
+++ b/day02/src/com/inmind/Demo06.java
@@ -0,0 +1,51 @@
+package com.inmind;
+/*
+算术运算中的++  --
+
+++ 表示在当前的基础+1
+-- 表示在当前的基础-1
+
+他们是针对变量来操作
+变量++，++变量
+
+他们的使用有2种方式：
+1.独立使用
+++,--在独立使用时没有区分
+	案例：
+		i++;
+		System.out.println(i);
+		++i;
+		System.out.println(i);
+2.组合使用
+	变量++:后增
+	++变量:先增
+
+	j = i++;  后增：先进行运算，再进行自增
+	j = ++i;  先增：先进行自增，再进行运算
+ */
+public class Demo06 {
+    public static void main(String[] args) {
+        //定义int变量
+        int i = 10;
+        //独立使用
+        i++;
+        System.out.println(i);//11
+        ++i;
+        System.out.println(i);// i = 12
+        System.out.println("--------------------------");
+        //混合使用
+        int j ;
+        j = i++;//后增：j = i ; i = i+1
+        System.out.println(i);// 13
+        System.out.println(j);// 12
+        System.out.println("-----------------------");
+        j=++i;//前增：i= i+1; j=i;
+        System.out.println(i);//14
+        System.out.println(j);//14
+        System.out.println("-----------------");
+        int a = 10;
+        int b = 20;
+        int c = a++ + ++b + --a - --b;
+        System.out.println(c);//21  21  21
+    }
+}