A.flush() B.nextInt() C.nextLine() D.clear()
A.Scanners=newScanner() B.Scanners=newScanner(System.in) C.Scanners=newScanner(System.out) D.Scanners=Scanner.getScanner()
A.輸入流 B.輸出流 C.輸入流和輸出流 D.二者都不需要