From 89c52020c98a4d4f1663a16e13ebe4e3c43c83f9 Mon Sep 17 00:00:00 2001
From: xuxin <840198532@qq.com>
Date: Thu, 30 Jul 2026 14:17:46 +0800
Subject: [PATCH] =?UTF-8?q?s-day01-StringBuilder=E6=A6=82=E8=BF=B0?=
 =?UTF-8?q?=E4=B8=8E=E6=9E=84=E9=80=A0=E6=96=B9=E6=B3=95(=E6=8B=BC?=
 =?UTF-8?q?=E6=8E=A5=E5=AD=97=E7=AC=A6=E4=B8=B2)?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../com/inmind/StringBuilder07/Demo17.java    | 23 +++++++++++++++++++
 1 file changed, 23 insertions(+)
 create mode 100644 s-day01/src/com/inmind/StringBuilder07/Demo17.java

diff --git a/s-day01/src/com/inmind/StringBuilder07/Demo17.java b/s-day01/src/com/inmind/StringBuilder07/Demo17.java
new file mode 100644
index 0000000..b40dbdd
--- /dev/null
+++ b/s-day01/src/com/inmind/StringBuilder07/Demo17.java
@@ -0,0 +1,23 @@
+package com.inmind.StringBuilder07;
+/*
+    注意：string类的拼接，会导致多余的字符串，就会字符串常量池中占用内存，那么可以使用StringBuilder来解决
+ */
+public class Demo17 {
+    public static void main(String[] args) {
+        String str1 = "hello";
+        String str2 = "java";
+        String str3 = "world";
+        /*
+        这样写字符串对象有几个？？？*/
+        System.out.println(str1+str2+str3);//产生了5个字符串对象
+
+        //StringBuilder可以优化以上代码的,这里只产生了4个字符串对象
+        StringBuilder sb = new StringBuilder();
+        sb = sb.append(str1).append(str2).append(str3);
+        System.out.println(sb);
+        String str4 = sb.toString();
+        System.out.println(str4);
+
+
+    }
+}