From 80e54e512f72ec6980e7e959696c537d9edd51d8 Mon Sep 17 00:00:00 2001
From: duandazhi <ab601026460@163.com>
Date: Fri, 26 Mar 2021 19:19:42 +0800
Subject: [PATCH] =?UTF-8?q?=E8=8E=B7=E5=8F=96=E5=B8=A6=E5=9C=88=E5=AD=97?=
 =?UTF-8?q?=E6=AF=8D=20/=E5=B0=81=E9=97=AD=E5=BC=8F=E5=AD=97=E6=AF=8D=20?=
 =?UTF-8?q?=EF=BC=8C=E4=BB=8Ea-z=20or=20A-Z?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../hutool/core/text/SpecialSymbolUtil.java   | 40 +++++++++++++++++--
 1 file changed, 36 insertions(+), 4 deletions(-)

diff --git a/hutool-core/src/main/java/cn/hutool/core/text/SpecialSymbolUtil.java b/hutool-core/src/main/java/cn/hutool/core/text/SpecialSymbolUtil.java
index b7c1b7bc9..968b62ffa 100644
--- a/hutool-core/src/main/java/cn/hutool/core/text/SpecialSymbolUtil.java
+++ b/hutool-core/src/main/java/cn/hutool/core/text/SpecialSymbolUtil.java
@@ -1,5 +1,7 @@
 package cn.hutool.core.text;
 
+import java.math.BigInteger;
+
 /**
  * 符号工具类
  * @author dazer & neusoft
@@ -51,18 +53,48 @@ public class SpecialSymbolUtil {
 	 * @param number 十进制数字，从1、-->10、11--->20
 	 * @return  ①②③④⑤⑥⑦⑧⑩⑪⑫⑬⑭⑮⑯⑰⑱⑲⑳
 	 */
-	public static String enclosedAlphanumericsCircleByInt(int number) {
+	public static String enclosedNumericsByInt(int number) {
 		if (number <= 0 || number > 20) {
 			throw new IllegalArgumentException("number取值范围是[1-20]的正整数,包含1和20");
 		}
 		String start = "①";
 		String unicodeStart = UnicodeUtil.toUnicode(start).substring(UNICODE_START_CHAR.length(),
 				UnicodeUtil.toUnicode(start).length() - 1);
-		String beginHex = unicodeStart.substring(0, 2); // begin: U+246x的24
-		String middleHex = number >= 17 ? "7" : "6"; //  U+246x的6
-		String endHex = Integer.toHexString(number >= 17 ? number - 17 : number - 1); // A
+		// begin: U+246x的24
+		String beginHex = unicodeStart.substring(0, 2);
+		//  U+246x的6
+		String middleHex = number >= 17 ? "7" : "6";
+		// A
+		String endHex = Integer.toHexString(number >= 17 ? number - 17 : number - 1);
 		// U + 24 + 60
 		String unicodeStr = UNICODE_START_CHAR + beginHex + middleHex + endHex;
 		return UnicodeUtil.toString(unicodeStr);
 	}
+
+	/**
+	 * 获取带圈字母 /封闭式字母 ，从a-z or A-Z
+	 * 根据字符 获取 Ⓐ Ⓑ Ⓒ Ⓓ Ⓔ Ⓕ Ⓖ Ⓗ Ⓘ Ⓙ Ⓚ Ⓛ Ⓜ Ⓝ Ⓞ Ⓟ Ⓠ Ⓡ Ⓢ Ⓣ Ⓤ Ⓥ Ⓦ Ⓧ Ⓨ Ⓩ ⓐ ⓑ ⓒ ⓓ ⓔ ⓕ ⓖ ⓗ ⓘ ⓙ ⓚ ⓛ ⓜ ⓝ ⓞ ⓟ ⓠ ⓡ ⓢ ⓣ ⓤ ⓥ ⓦ ⓧ ⓨ ⓩ
+	 * <code>
+	 *      System.out.println(encloseAlphabetByChar( 'A'));
+	 * 		System.out.println(encloseAlphabetByChar( 'a'));
+	 * 		System.out.println(encloseAlphabetByChar( 'z'));
+	 * 		System.out.println(encloseAlphabetByChar( 'Z'))
+	 * </code>
+	 * @author dazer
+	 * @param letter 字母，不区分大小写，'a'、'b'、'c'、'd'...'x'、'y'、'z'; 'A'、'B'...'Z'
+	 * @date 2021/3/26 18:10
+	 */
+	public static String encloseAlphabetByChar(char letter) {
+		if (!(letter >= 'a' && letter <= 'z' || letter >= 'A' && letter <= 'Z')) {
+			throw new IllegalArgumentException("number取值范围是[a-z]、[A-Z]的字符");
+		}
+		// \u24b6
+		String start = "Ⓐ";
+		String hexStr = UnicodeUtil.toUnicode(start).substring(UNICODE_START_CHAR.length());
+		int difference = letter >= 'a' && letter <= 'z' ? (letter - (int)'a') : (letter - (int)'A');
+		String hex = new BigInteger(hexStr, 16).add(new BigInteger(String.valueOf(difference), 10)).toString(16);
+		//
+		String unicodeStr = UNICODE_START_CHAR + hex;
+		return UnicodeUtil.toString(unicodeStr);
+	}
 }