JAVA区分中文和英文

以前老大写的一个判断中文的方法：

public static boolean isChinese(char c) {
   Character.UnicodeBlock ub = Character.UnicodeBlock.of(c);
   if (ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS
     || ub == Character.UnicodeBlock.CJK_COMPATIBILITY_IDEOGRAPHS
     || ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS_EXTENSION_A) {
    return true;
   }
   return false;
}