我有一个像这样的简单程序:packagetest;publicclassTestGenericsInheritance{publicstaticvoidmain(String[]args){}publicstaticabstractclassA{publicvoidfoo2(Qobj){}publicabstractvoidfoo(Tobj);}publicstaticclassCextendsA{@Overridepublicvoidfoo(Tobj){}}publicstaticclassBextendsA{@Overridepublicvoidfoo(Tobj){}}}如您所见，