package?thlfive.com; public?class?ImplmentPreson?{ public?static?void?main(String[]?args)?{ singer?s1=new?student("s1"); s1.sing(); s1.sleep(); student?student=(thlfive.com.student)?s1; student.getName(); singer?s2=new?teacher("t2"); s2.sing(); s2.sleep(); if?(?s2?instanceof?dance)?{ dance?d1=(dance)?s2; d1.dancing(); d1.sleep(); } } } interface?singer{ public?void?sing(); public?void?sleep(); } interface?dance{ public?void?dancing(); public?void?sleep(); } class?student?implements?singer?{ private?String?name; public?student(String?name)?{ //?TODO?Auto-generated?constructor?stub this.name=name; } public?void?setName(String?name)?{ this.name?=?name; } public?String?getName()?{ return?name; } @Override public?void?sing()?{ //?TODO?Auto-generated?method?stub System.out.println("student?in?sing?"); } @Override public?void?sleep()?{ //?TODO?Auto-generated?method?stub System.out.println("student?in?sleep"); } public?void?study()?{ System.out.println("studing"); } } class?teacher?implements?singer,dance{ private?String?name; public?teacher(String?name)?{ //?TODO?Auto-generated?constructor?stub this.name=name; } public?String?getName()?{ return?name; } @Override public?void?dancing()?{ //?TODO?Auto-generated?method?stub System.out.println("teacher?in?dancing"); } @Override public?void?sing()?{ //?TODO?Auto-generated?method?stub System.out.println("teacher?in?sing"); } @Override public?void?sleep()?{ //?TODO?Auto-generated?method?stub System.out.println("teacher?in?sleep"); } public?void?teach()?{ System.out.println("teaching"); } }