5 ways to copy a text file in Java 21-8

Requirements: Copying text files
Analysis:
Because the text file we open with Notepad can be read, so use a character stream.
　　There are 5 ways to copy a character stream:

First write the Main method

1      Public Static voidMain (string[] args)throwsIOException {2         //Data Source3String startfile = "c:\\users\\administrator\\desktop\\ new Folder \\start.txt";4         //Destination5String endfile = "c:\\users\\administrator\\desktop\\ new Folder \\end.txt";6         7         //method1 (startfile,endfile);8         //method2 (startfile,endfile);9         //method3 (startfile,endfile);Ten         //method4 (startfile,endfile); One Method5 (startfile,endfile); A  -}

The first way: the basic character stream reads one character at a time

1     Private Static voidMethod1 (String startfile,string endfile)throwsIOException {2         //basic character stream reads and writes one character at a time3         //Encapsulating Data Sources4FileReader FR =NewFileReader (startfile);5         //Package Destination6FileWriter FW =NewFileWriter (endfile);7         8         //Read and write one character at a time9         intCH = 0;Ten          while(ch = fr.read ())! =-1){ One fw.write (CH); A         } -         //Freeing Resources - fr.close (); the fw.close (); -}

The second way: the basic character stream reads one character array at a time

1     Private Static voidMETHOD2 (String startfile, String endfile)throwsIOException {2         //The basic character stream reads and writes one character array at a time3FileReader FR =NewFileReader (startfile);4FileWriter FW =NewFileWriter (endfile);5         6         Char[] ch =New Char[1024];7         intLen = 0;8          while(len = fr.read (ch))! =-1){9Fw.write (Ch,0,len);//we need to be awareTen         } One fr.close (); A fw.close (); -}

Third Way: Buffer character Stream reads one character at a time

1     Private Static voidMethod3 (String startfile, String endfile)throwsioexception{2         //character Buffer Stream reads one character at a time3BufferedReader br =NewBufferedReader (NewFileReader (Startfile));4BufferedWriter BW =NewBufferedWriter (NewFileWriter (Endfile));5         intCH = 0;6          while(ch = br.read ())! =-1){7 bw.write (CH);8         }9 br.close ();Ten bw.close (); One          A}

Fourth Way: Buffer character Stream reads one character array at a time

1     Private Static voidMETHOD4 (String startfile, String endfile)throwsIOException {2         //character Buffer stream reads one character array at a time3BufferedWriter BW =NewBufferedWriter (NewFileWriter (Endfile));4BufferedReader br =NewBufferedReader (NewFileReader (Startfile));5         Char[] ch =New Char[1024];6         intLen = 0;7          while(len = br.read (ch))! =-1){8Bw.write (ch,0, Len);9         }Ten br.close (); One bw.close (); A          -}

Fifth way: Buffer character stream read one string at a time (master)

    Private Static voidMETHOD5 (String startfile, String endfile)throwsIOException {//character Buffer stream reads one string at a timeBufferedReader br =NewBufferedReader (NewFileReader (startfile)); BufferedWriter BW=NewBufferedWriter (NewFileWriter (endfile)); String Line=NULL;  while(line = Br.readline ())! =NULL) {bw.write (line);                Bw.newline ();            } br.close ();                Bw.close (); }

5 ways to copy a text file in Java 21-8