The basic usage of bufferedwriter and BufferedReader, attached to the demo program. and a program that copies text files.

bufferedwriter and BufferedReader output input streams for characters with default buffers, because there is a buffer so it is more efficient than no buffer. First, BufferedWriter class

construction Method: bufferedwriter bf = new BufferedWriter (Writer out);

Main method: void Write (char ch);//write a single character.

void Write (char []cbuf,int off,int Len) writes a portion of the character data.

void Write (string s,int off,int len) is written to a part of the string.

void newline ()//writes a row separator.

void Flush ();//Flushes the buffer in the stream. Writes the buffered data to the destination file.

void Close ();//closes this stream, and refreshes him before closing.

Package buffered;

Import Java.io.BufferedWriter;
Import Java.io.FileWriter;
Import java.io.IOException;

public class Bufferedwriterdemo {public
	static void Main (string[] args) throws IOException {
		FileWriter fw = new FileWriter ("Buffered.txt");		fw.write ("ok168");		fw.close ();
		/**
		 * In order to improve the efficiency of writing, a character stream buffer is used.
		 * Creates a buffer object with a character write inflow and is associated with a stream object that specifies the buffer to be buffered.
		 */
		BufferedWriter BUFW = new BufferedWriter (FW);
		
		Writes data to a buffer using a method in the buffer.
		bufw.write ("Hello World!");
		Bufw.newline ();
		Bufw.newline ();
		Bufw.write ("!hello world!");
		Bufw.write ("!hello world!");
		Use the method in the buffer to flush the data to the destination file.
		Bufw.flush ();
		Closes the buffer while closing the FW stream object
		bufw.close ();	
	}

Second, BufferedReader class.

Construction Method: BufferedReader br = new Bufferreader (Reader in);

Main method: int read ();//Read single character.

int Read (char[] cbuf,int off,int len);//Read the character to a part of the array. Returns the number of characters read. Reach the tail, return-1.

String readLine (); Reads a line of text.

void Close (); Closes the stream. and releases all resources associated with the stream.

Package buffered;

Import Java.io.BufferedWriter;
Import Java.io.FileWriter;
Import java.io.IOException;

public class Bufferedwriterdemo {public
	static void Main (string[] args) throws IOException {
		FileWriter fw = new FileWriter ("Buffered.txt");		fw.write ("ok168");		fw.close ();
		/**
		 * In order to improve the efficiency of writing, a character stream buffer is used.
		 * Creates a buffer object with a character write inflow and is associated with a stream object that specifies the buffer to be buffered.
		 */
		BufferedWriter BUFW = new BufferedWriter (FW);
		
		Writes data to a buffer using a method in the buffer.
		bufw.write ("Hello World!");
		Bufw.newline ();
		Bufw.newline ();
		Bufw.write ("!hello world!");
		Bufw.write ("!hello world!");
		Use the method in the buffer to flush the data to the destination file.
		Bufw.flush ();
		Closes the buffer while closing the FW stream object
		bufw.close ();	
	}

a custom Mybufferedreader class.

Package buffered;

Import Java.io.FileReader;
Import java.io.IOException;

public class Mybufferedreader {
	
	private filereader fr;
	Private char []BUF = new char[1024];
	private int count = 0;
	private int pos = 0;
	Public Mybufferedreader (FileReader f) {
		this.fr = f;		
	}
	public int Myread () throws ioexception{
		if (count = = 0) {
			count = Fr.read (BUF);
			pos = 0;
		}
		if (count<0)
			return-1;
		int ch = buf[pos++];
		count--;
		return ch; 
	}
	
	Public String Myreadline () throws ioexception{
		StringBuilder sb = new StringBuilder ();
		int ch = 0;
		while (ch = myread ())!=-1) {
			if (ch = = ' \ r ')
				continue;
			if (ch = = ' \ n ') return
				sb.tostring ();
			Sb.append ((char) ch);
			if (count = = 0) return
				sb.tostring ();			
		}
		return null;
	}
	public void Myclose () throws IOException {
		fr.close ();
	}
}

A small program that uses the BufferedReader and Bufferwriter methods to write a copy of text.

Package iotest;

Import Java.io.BufferedReader;
Import Java.io.BufferedWriter;
Import Java.io.FileReader;
Import Java.io.FileWriter;
Import java.io.IOException;

The public class Textcopybybuf {

	/**
	 * First creates the files to be copied by the read character Data Flow Object Association.
	 * Create a Buffer object association stream object.
	 * Creates and writes characters from a buffer into a headlines file.
	 * @throws IOException 
	 *
	/public static void main (string[] args) throws IOException {
		FileReader fr = New FileReader ("C:\\demo.txt");
		FileWriter FW = new FileWriter ("D:\\love.txt");
		BufferedReader bufr = new BufferedReader (FR);
		BufferedWriter BUFW = new BufferedWriter (FW);
		Write on one line.
		String line = null;
		while (line = Bufr.readline ())!= null) {
			bufw.write (line);
			Bufw.newline ();
			Bufw.flush ();
		}
	/*	A word is written in one word.
	    int ch = 0;
		while (ch = bufr.read ())!=-1) {
			bufw.write (ch);
		} * *
		bufr.close ();
		Bufw.close ();
	}