BufferedReaderin=newBufferedReader(newFileReader("foo.in"));willbuffertheinputfromthespecifiedfile.Withoutbuffering,eachinvocationofread()orreadLine()couldcausebytestobereadfromthefile,convertedintocharacters,andthenreturned,whichcanbeveryinefficient.這段話怎么理解，如果使用了緩沖區就不會涉及到byte轉character？求兩個讀取文件的流程和效率對比，先行謝過了。