IO Stream Basic operations

The first method of division:1. Input stream 2. Output stream The second method of division:1. Byte stream 2. The third type of character stream:1. Node stream 2. Process Flow////////////////////////////////////////////////////////////////////////////byte stream:What is the subclass of InputStream? Fileinputstream;inputstream:intReadbyte[]b,intOffintlen) read from the first, read a few, return the number of reads OutputStream subclass is? Fileoutputstreamoutputstream:voidWritebyte[]b,intOffintlen) Public Static voidMain (String args[]) {FileInputStreaminch=NULL; FileOutputStream out=NULL; Try {            inch=NewFileInputStream ("E:/from.txt");//input stream (read data from a file, i.e. data input into the program)             out=NewFileOutputStream ("E:/to.txt");//output Stream (writes file data, i.e. data output into a file)            byte[] buffer =New  byte[ -];//an array of bytes to hold the Read data            intnum =inch. read (buffer,0, buffer.length);//read from the No. 0 bit, read the buffer.length of the From.txt file, put it in buffer             out. write (buffer,0, num);//The Read method returns the number of reads//out.write (buffer, 0, 2);//starting with 0 bits, write the 2 bytes of the buffer array into the To.txt file .             for(inti =0; i<buffer.length;i++) {System. out. Print (Buffer[i]); }string s=NewString (buffer);//Convert to original characterS= S.trim ();//Trim Method: Remove the leading and trailing blanks and empty characters, the middle space is not removedSystem. out. Print (s); } Catch(Exception e) {//TODO auto-generated Catch blockE.printstacktrace (); }finally{            Try {                inch. Close ();  out. Close (); } Catch(IOException e) {//TODO auto-generated Catch blockE.printstacktrace (); }}} read large files: Public Static voidMain (String args[]) {FileInputStreaminch=NULL; FileOutputStream out=NULL; intA =0; Try {            inch=NewFileInputStream ("E:/from.txt");//input stream (read data from a file, i.e. data input into the program)             out=NewFileOutputStream ("E:/to.txt");//output Stream (writes file data, i.e. data output into a file)            byte[] buffer =New  byte[1024x768];//an array of bytes to hold the Read data             while(true) {a++; System. out. Print (a); intnum =inch. read (buffer,0, buffer.length);//read from the No. 0 bit, read the buffer.length of the From.txt file, put it in buffer                 out. write (buffer,0, num);//The Read method returns the number of reads                if(num = =-1){//returns-1, indicating that the read is complete                     Break; }            }                } Catch(Exception e) {//TODO auto-generated Catch blockE.printstacktrace (); }        finally{            Try {                inch. Close ();  out. Close (); } Catch(IOException e) {//TODO auto-generated Catch blockE.printstacktrace (); }            }////////////////////////////////////////Character stream: characters-based when reading and writing filesbyte input stream: What is the subclass of Reader? FileReaderintReadChar[] C,intOffintlen) Bytes output stream: What is the subclass of Writer? FileWritervoidWriteChar[] C,intOffintlen) Public Static voidMain (String args[]) {FileReader reader=NULL; FileWriter writer=NULL; Try{Reader=NewFileReader ("E:/from.txt"); Writer=NewFileWriter ("E:/to.txt"); Char[] buffer =New Char[ -]; intnum = reader.read (buffer,0, buffer.length); Writer.write (Buffer,0, num);  for(inti =0; i<num;i++) {System. out. Print (Buffer[i]); }        }        Catch(Exception e) {System. out. Print (e); }        finally{            Try{reader.close ();            Writer.close (); }            Catch(Exception e) {System. out. Print ("Success!!!"); }        }}/////////////////////////////////////////////////read one row of data at once Public Static voidMain (String args[]) {FileReader FileReader=NULL; BufferedReader BufferedReader=NULL; Try{FileReader=NewFileReader ("E:/from.txt"); BufferedReader=NewBufferedReader (FileReader); String Line=NULL;  while(true) { line=Bufferedreader.readline (); if(line = =NULL){                 Break; } System. out. println (line); }        }        Catch(Exception e) {System. out. println (e); }        finally{            Try{bufferedreader.close ();            Filereader.close (); }            Catch(Exception e) {System. out. println (e); }                    }

IO Stream Basic operations