From d5d81bdd15e14c309905420b78b9ddbc31ced364 Mon Sep 17 00:00:00 2001
From: Looly <loolly@aliyun.com>
Date: Fri, 11 Apr 2025 19:13:40 +0800
Subject: [PATCH] =?UTF-8?q?`CharSequenceUtil`=E5=A2=9E=E5=8A=A0toLoweCase?=
 =?UTF-8?q?=E5=92=8CtoUpperCase=E6=96=B9=E6=B3=95=EF=BC=88issue#IC0H2B@Git?=
 =?UTF-8?q?ee=EF=BC=89?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 CHANGELOG.md                                  |  1 +
 .../cn/hutool/core/text/CharSequenceUtil.java | 36 +++++++++++++++++++
 2 files changed, 37 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 03a682c77..b0168b2a3 100755
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,7 @@
 * 【core   】      `PathUtil#del`增加null检查（pr#1331@Gitee）
 * 【db     】      增加SAP HANA识别及方言（pr#3914@Github）
 * 【crypto 】      增加`Argon2`类，实现Argon2算法（issue#3890@Github）
+* 【core   】      `CharSequenceUtil`增加toLoweCase和toUpperCase方法（issue#IC0H2B@Gitee）
 
 ### 🐞Bug修复
 
diff --git a/hutool-core/src/main/java/cn/hutool/core/text/CharSequenceUtil.java b/hutool-core/src/main/java/cn/hutool/core/text/CharSequenceUtil.java
index 10c27984a..358822592 100755
--- a/hutool-core/src/main/java/cn/hutool/core/text/CharSequenceUtil.java
+++ b/hutool-core/src/main/java/cn/hutool/core/text/CharSequenceUtil.java
@@ -4237,6 +4237,42 @@ public class CharSequenceUtil {
 
 	// ------------------------------------------------------------------------ lower and upper
 
+	/**
+	 * 将字符串转为小写
+	 *
+	 * @param str 被转的字符串
+	 * @return 转换后的字符串
+	 * @see String#toLowerCase()
+	 * @since 5.8.38
+	 */
+	public static String toLoweCase(final CharSequence str) {
+		if (null == str) {
+			return null;
+		}
+		if(0 == str.length()){
+			return EMPTY;
+		}
+		return str.toString().toLowerCase();
+	}
+
+	/**
+	 * 将字符串转为大写
+	 *
+	 * @param str 被转的字符串
+	 * @return 转换后的字符串
+	 * @see String#toUpperCase()
+	 * @since 5.8.38
+	 */
+	public static String toUpperCase(final CharSequence str) {
+		if (null == str) {
+			return null;
+		}
+		if(0 == str.length()){
+			return EMPTY;
+		}
+		return str.toString().toUpperCase();
+	}
+
 	/**
 	 * 原字符串首字母大写并在其首部添加指定字符串 例如：str=name, preString=get =》 return getName
 	 *