A.PrintWriterprtWtr=newPrintWriter(f);
B.PrintWriterprtWtr=newPrintWriter(fw);
C.PrintWriterprtWtr=newPrintWriter(bw);
D.BufferWriterbufWtr=newBufferedWriter(f);
E.BufferWriterbufWtr=newBufferedWriter(fw);
F.BufferWriterbufWtr=newBufferedWriter(bw);
正确答案:参考D



