我有这些声明:int\u65549=9;System.out.println(\u65549);这编译完美。并输出9但是:System.out.println(Character.isJavaIdentifierStart(\u65549));输出false我对这个话题做了一些研究。我阅读了文档，它说:Thismethodcannothandlesupplementarycharacters.TosupportallUnicodecharacters,includingsupplementarycharacters,usetheisJavaIdentifierStart(int)met