From 917fb01c5a1f84dc1dd6d3401307c41f3c18a13c Mon Sep 17 00:00:00 2001
From: xuxin <840198532@qq.com>
Date: Tue, 15 Sep 2026 11:50:47 +0800
Subject: [PATCH] =?UTF-8?q?day02--=E8=BF=90=E7=AE=97=E7=AC=A6=5F=E7=AE=97?=
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---
 day02/src/com/inmind/operator02/Demo07.java | 58 +++++++++++++++++++++
 1 file changed, 58 insertions(+)
 create mode 100644 day02/src/com/inmind/operator02/Demo07.java

diff --git a/day02/src/com/inmind/operator02/Demo07.java b/day02/src/com/inmind/operator02/Demo07.java
new file mode 100644
index 0000000..ab8cad8
--- /dev/null
+++ b/day02/src/com/inmind/operator02/Demo07.java
@@ -0,0 +1,58 @@
+package com.inmind.operator02;
+/*
+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 Demo07 {
+    public static void main(String[] args) {
+        int i = 10;
+        //1.独立使用
+//        i++;
+        ++i;
+        System.out.println(i);//11
+
+        //2.组合使用
+        int j;
+        //后增：先进行运算，再进行自增
+       /* j = i++;//j = i; i = i + 1;
+        System.out.println("i的值为："+i);//12
+        System.out.println("j的值为："+j);//11*/
+
+        //先增：先进行自增，再进行运算
+       j = ++i;//i = i+1; j = i;
+        System.out.println("i的值为："+i);//12
+        System.out.println("j的值为："+j);//12
+
+        //随意出题：
+        int a = 10;
+        int b = 5;
+        int sum = a++ + ++ b + a++ + b++;
+        //int sum1 = a-- + -- b + a++ + b++;
+
+        System.out.println(sum);//33
+        System.out.println(a);//12
+        System.out.println(b);//7
+
+    }
+}