add method

hutool-core/src/main/java/org/dromara/hutool/core/text/CharSequenceUtil.java

@@ -3111,6 +3111,18 @@ public class CharSequenceUtil extends StrChecker {
 		return cs == null ? 0 : cs.length();
 	}
 
+	/**
+	 * 获取字符串的Unicode字符长度，如果为{@code null}返回0<br>
+	 * Unicode字符长度指实际Unicode字符个数，如emoji算一个字符
+	 *
+	 * @param cs a 字符串
+	 * @return 字符串的长度，如果为{@code null}返回0
+	 * @since 6.0.0
+	 */
+	public static int codeLength(final CharSequence cs) {
+		return cs == null ? 0 : cs.toString().codePointCount(0, cs.length());
+	}
+
 	/**
 	 * 给定字符串转为bytes后的byte数（byte长度）
 	 *

hutool-core/src/test/java/org/dromara/hutool/core/text/CharSequenceUtilTest.java

@@ -284,4 +284,12 @@ public class CharSequenceUtilTest {
 		// Expect common suffix: { space * 10 }
 		Assertions.assertEquals(CharSequenceUtil.repeat(CharSequenceUtil.SPACE, 10), CharSequenceUtil.commonSuffix(str1, str2));
 	}
+
+	@Test
+	void codeLengthTest() {
+		String a = "🍒🐽";
+		final int i = StrUtil.codeLength(a);
+		Assertions.assertEquals(4, a.length());
+		Assertions.assertEquals(2, i);
+	}
 }