diff --git a/hutool-core/src/main/java/org/dromara/hutool/core/text/StrUtil.java b/hutool-core/src/main/java/org/dromara/hutool/core/text/StrUtil.java
index 1f6eab1fd..898c298fd 100644
--- a/hutool-core/src/main/java/org/dromara/hutool/core/text/StrUtil.java
+++ b/hutool-core/src/main/java/org/dromara/hutool/core/text/StrUtil.java
@@ -25,7 +25,6 @@ import java.io.StringReader;
 import java.io.StringWriter;
 import java.nio.ByteBuffer;
 import java.nio.charset.Charset;
-import java.util.Optional;
 
 /**
  * 字符串工具类<br>
@@ -372,41 +371,4 @@ public class StrUtil extends CharSequenceUtil implements StrPool {
 	public static String similar(final String str1, final String str2, final int scale) {
 		return TextSimilarity.similar(str1, str2, scale);
 	}
-
-	/**
-	 * 字符串填充
-	 * @param str 被填充的字符串(原始字符串)
-	 * @param left 往原始字符串的左边填充
-	 * @param right 往原始字符串的右边填充
-	 * @param middle 往原始字符串的中间填充
-	 * @param middlePos 填充的索引位置
-	 * @return flexibleConcat
-	 */
-	public static String flexibleConcat(String str, String left, String right, String middle, int middlePos) {
-		// 使用 StringBuilder 来提高拼接性能
-		StringBuilder sb = new StringBuilder();
-
-		// 如果原始字符串不为 null，添加到 StringBuilder
-		if (str != null) {
-			sb.append(str);
-		}
-
-		// 左边拼接字符串（如果有
-		Optional.ofNullable(left)
-			.filter(s -> !s.isEmpty())
-			.ifPresent(l -> sb.insert(0, l.toCharArray()));
-
-		// 右边拼接字符串（如果有）
-		Optional.ofNullable(right)
-			.filter(s -> !s.isEmpty())
-			.ifPresent(sb::append);
-
-		// 中间拼接字符串（如果有且位置有效）
-		Optional.ofNullable(middle)
-			.filter(s -> !s.isEmpty())
-			.filter(s -> middlePos >= 0 && middlePos <= sb.length())
-			.ifPresent(m -> sb.insert(middlePos, m.toCharArray()));
-
-		return sb.toString();
-	}
 }
diff --git a/hutool-core/src/test/java/org/dromara/hutool/core/text/CharSequenceUtilTest.java b/hutool-core/src/test/java/org/dromara/hutool/core/text/CharSequenceUtilTest.java
index b30f3f3d7..5f24e5b2f 100644
--- a/hutool-core/src/test/java/org/dromara/hutool/core/text/CharSequenceUtilTest.java
+++ b/hutool-core/src/test/java/org/dromara/hutool/core/text/CharSequenceUtilTest.java
@@ -229,14 +229,14 @@ public class CharSequenceUtilTest {
 	public void replaceLastTest() {
 		final String str = "i am jack and jack";
 		final String result = StrUtil.replaceLast(str, "JACK", null, true);
-		assertEquals(result, "i am jack and ");
+		assertEquals("i am jack and ", result);
 	}
 
 	@Test
 	public void replaceFirstTest() {
 		final String str = "yes and yes i do";
 		final String result = StrUtil.replaceFirst(str, "YES", "", true);
-		assertEquals(result, " and yes i do");
+		assertEquals(" and yes i do", result);
 	}
 
 	@Test
@@ -539,4 +539,9 @@ public class CharSequenceUtilTest {
 		assertEquals("a", CharSequenceUtil.stripAll("aba", "ab", "ba"));
 		assertEquals("a", CharSequenceUtil.stripAll("abababa", "ab", "ba"));
 	}
+
+	@Test
+	void concatTest() {
+		assertEquals("abc", CharSequenceUtil.concat(true, "a", "b", "c"));
+	}
 }