package day10_io_fileWrite_Read.buffer_stream;

import java.io.*;

/*

 * BufferedWriter:将文本写入字符输出流，缓冲各个字符，从而提供单个字符、数组和字符串的高效写入。

 * BufferedReader:从字符输入流中读取文本，缓冲各个字符，从而实现字符、数组和行的高效读取。

 */

public class BufferedStream {

    public static void main(String[] args) throws IOException {

        BufferedReader br = new BufferedReader(new FileReader("c.txt")); //bufferedreader(reader)

        BufferedWriter bw = new BufferedWriter(new FileWriter("copy.txt"));

//        //一次读写一个字符

//        int len;

//        while((len=br.read())!=-1) {

//            bw.write(len);

//        }

//

        //一次读写一个数组

        char[] arr = new char[];

        int len1;

        while((len1=br.read(arr))!=-) {

            bw.write(arr);

        }

        bw.close();

        br.close();

    }

}

package day10_io_fileWrite_Read.buffer_stream;

import java.io.*;

/*

 * 缓冲流的特殊功能：

 * BufferedWriter

 *         void newLine():写一个换行符，这个换行符由系统决定

 * BufferedReader

 *         String readLine():一次读取一行数据，但是不读取换行符

 */

public class BufferLine {

    public static void main(String[] args) throws IOException {

        BufferedReader br = new BufferedReader(new FileReader("b.txt"));

        BufferedWriter bw = new BufferedWriter(new FileWriter("copy.txt"));

        /*一次读取一行

        String line = br.readLine();

        System.out.println(line);

        line = br.readLine();

        System.out.println(line);//当行读完时返回为null

        */

        String len;

        while((len=br.readLine())!=null) {

            bw.write(len);

            bw.newLine();

            bw.flush();

        }

        bw.close();

        br.close();

    }

}