?????程序讀寫信程序讀寫信ReadingdataintoaWritingdatatoa順序讀寫數據的順序讀寫數據的算讀寫打開一個關閉打開一個關閉Java的讀寫Java的讀寫流算法的流類-層次結構，一個用于讀寫字節(Byte)，一個用于讀寫字符(Character)。字節字節(Byte字節流的類層字節流的類層字節流的類層字節流的類層字符字符（Character字符流的類層字符流的類層字符流的類層字符流的類層I/O超I/O超使用流p212表intread(intread(byte[])intread(byte[]voidclose()intavailable()skip(long???????int,markSupported(mark(intreset(輸出流輸出流常用方write(byte[],int,flush(close(Java的I/O：Java的I/O：讀和第九File文件流File文件流（FileReader、FileWriter、FileInputStream、Example:CopyBytes;CopyFilemyFile=myFilenewFile（”/docs”，”mymoted”）；FilemyDir=newFile（”/docs”）；myFile=new文件測試和一些實用方文件測試和一些實用方???StringgetParent（）獲取當前對?booleanrenameTo（FilenewName）將當前對?文件測試和一文件測試和一些實用方??????Example:文件測試和一些實用方文件測試和一些實用方longlastModified（）檢測當前File對象所對應???longlength（）檢測文件長booleandelete（）刪除當前File對象所對應booleanmkdir（）建立一個目錄，其路徑名由當前FilString[]list（）列出當前File對象所指定目錄?Bu?eredBu?ered?Example:UsefulUsefulforbreakingdownformattedinputintoimportjava.util.ScannerScanners=null;//initialisationExample:Example:ScanXan,ScanSum,????如何聯如何聯結文Example:DataInputStream和BufferedInputStream和DataTheDataTheDataInputStreamclassenablesyoutoreadJavaprimitivesfromInputStream'sinsteadofonlybytes.Example:使用過使用過濾器DataInputStreamin=newDataInputStream(System.in);Stringinput;編寫自編寫自己的過濾器步驟類覆蓋read和write方法，如果需要還應該覆蓋提供新方確保輸入和輸出流可以協同工Java的I/O：Java的I/O：讀和第九對象的對象的串行對對象對對象進行串行將對象將對象寫到流FileOutputStreamout=newObjectOutputStreams=new//CreateanObjectOutputStreamthatwritestotheFileOutputStreams.writeObject(“Today”);//Stringobjects.writeObject(newDate(s.flush(將對將對象寫到流FileInputStreamin=newFileInputStream(“theTime”);ObjectInputStreams=newObjectInputStream(in);Stringtoday=(String)s.readObject();Datedate=(Date)s.readObject(Example:為類提供為類提供對象串行publicclassClassNameimplements}Example:為類為類提供對象串行對象的類的標所有非transient和非static成員的值，包括Example:Java的I/O：Java的I/O：讀和第九隨機隨機訪問文使用使用隨機訪問文newRandomAccessFile（”farrago.txt”，”r”）隨機訪隨機訪問文隨機訪問隨機訪問文 longgetFilePointer（）：返回文件指針當前位 voidseek（long）：將文件指針定位到指定字節 intskipBytes(int)：將文件指針向前移動指定的字節Example:Random1,Random2,RandomReverse.為隨為隨機訪問文件編寫過濾因為RadomAccessFile實現了DataInput和DataOutputJavaInputandOutput---JavaJavaInputandOutput---Javadealswithinputandoutputviadata?Copyofdatatravelsasasequenceofbyteswithinacommunicationstream,fromsourcetodestinationo?AdvantageofDonotneedtocareaboutsource,typeandDealwithalldata,withinastream,inthesame?DatawithinstreamisbrokenintosmallTheapplicationreadingthestreamhastoreadtokensandre-assemblethemtogettheoriginaldatabeingtransmittedo?AprogramcanmaintainmultipleoDifferentstreamscanhavedifferentJavaInputandOutput--JavadealsJavaInputandOutput--Javadealswithinputandoutputviadata?Copyofdatatravelsasasequenceofbyteswithinacommunicationstream,fromsourcetodestinationo?AdvantageofDonotneedtocareaboutsource,typeandDealwithalldata,withinastream,inthesame?DatawithinstreamisbrokenintosmallTheapplicationre