25th section (conversion stream, print stream)

the conversion flow is mainly two inputstreamreader and OutputStreamWriter1. InputStreamReader is mainly the conversion of byte stream input into character input stream .2. OutputStreamWriter is mainly to convert the output stream of byte stream into character output flow Inputstreamreader:outputstreamwriter/*InputStreamReader is mainly the conversion of byte stream input into character input stream .*/import java.io.*; Public classinputstreamreadertest01{ Public Static voidMain (string[] args) {bufferedreader br=NULL; Try{            //byte input stream//FileInputStream fis = new FileInputStream ("C:\\work\\java\\arry.txt"); //character input stream//InputStreamReader ISR = new InputStreamReader (FIS);BR=NewBufferedReader (NewInputStreamReader (NewFileInputStream ("C:\\work\\java\\arry.txt"))); String Temp=NULL;  while(temp = Br.readline ())! =NULL) {System. out. println (temp); }                                } Catch(FileNotFoundException e) {e.printstacktrace (); } Catch(IOException e) {e.printstacktrace (); } finally{            Try{                if(BR! =NULL) {br.close (); }            } Catch(IOException e) {e.printstacktrace (); }        }                    }}/////////////////////////////////////////////////////////////////*OutputStreamWriter is mainly to convert the output stream of a byte stream into a character output flow*/import java.io.*; Public classoutputstreamwritertest01{ Public Static voidMain (string[] args) {BufferedWriter bw=NULL; Try{                        //byte output stream//FileOutputStream fos = new FileOutputStream ("C:\\work\\java\\arry.txt"); //character output stream//OutputStreamWriter OSW = new OutputStreamWriter (FOS);BW=NewBufferedWriter (NewOutputStreamWriter (NewFileOutputStream ("C:\\work\\java\\arry.txt"))); Bw.write ("Zhongshan College");                        Bw.newline (); Bw.write ("I love my country.");                Bw.flush (); } Catch(FileNotFoundException e) {e.printstacktrace (); } Catch(IOException e) {e.printstacktrace (); } finally{            Try{                if(BW! =NULL) {bw.close (); }            } Catch(IOException e) {e.printstacktrace (); }        }    }}

The print stream consists of two main: PrintStream and PrintWriter, respectively, corresponding to the byte stream and character stream to complete the screen printing redirect usage with StringBuffer, StringBuilder and StringBuffer is All the methods in StringBuffer are synchronous, thread-safe, but slow and StringBuilder fast, but not thread-safe/*To complete the screen printing redirect System.out corresponds to the PrintStream, the default in the output in the console, we can redirect his output, can be directed to the file is executed System.out.println ("Ming"); Output to a file without outputting to the screen*/import java.io.*; Public classprintstreamtest01{ Public Static voidMain (string[] args) {FileOutputStream fos=NULL; Try{fos=NewFileOutputStream ("C:\\work\\java\\arry.txt"); PrintStream PS=NewPrintStream (FOS);                        System.setout (PS); System. out. println ("Ming is very handsome!"); } Catch(FileNotFoundException e) {e.printstacktrace (); } Catch(IOException e) {e.printstacktrace (); } finally{            Try{                if(Fos! =NULL) {fos.close (); }            }Catch(IOException e) {e.printstacktrace (); }        }    }}////////////////////////////////////////////////////////////////////*system.in can receive input from the screen*/import java.io.*; Public classprintstreamtest02{ Public Static voidMain (string[] args) {bufferedreader br=NULL; Try{InputStreamReader ISR=NewInputStreamReader (System.inch); BR=NewBufferedReader (ISR); String Temp=NULL;  while(temp = Br.readline ())! =NULL) {System. out. println (temp); //if output w exits the loop                if("W". Equals (temp)) {                     Break; }                }        } Catch(FileNotFoundException e) {e.printstacktrace (); } Catch(IOException e) {e.printstacktrace (); } finally{            Try{                if(BR! =NULL) {br.close (); }            }Catch(IOException e) {e.printstacktrace (); }        }    }}

25th section (conversion stream, print stream)