packagecom.java3y.austin.test; abstractclassA{ publicabstractvoidtest(); } classBextendsA{ B(){ System.out.println("B的构造函数"); } @Override publicvoidtest(){ System.out.println("B的test函数"); } } classCextendsA{ C(){ System.out.println("C的构造函数"); } @Override publicvoidtest(){ System.out.println("C...