IO的九种复制

package fivecopy;

import java.io.*;

public class FileIo {
    public static void main(String[] args) throws IOException {
         method();
         method1();
         method2();
         method3();
         method4();
        //后四种为字节复制
         method5();
         method6();
         method7();
         method8();

    }

    private static void method8() throws IOException{
        BufferedInputStream bis = new BufferedInputStream(new FileInputStream("yf.txt"));
        BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream("yf9.txt"));

        byte[] bytes = new byte[1024];
        int length;
        while ((length = bis.read(bytes)) != -1) {
            bos.write(bytes, 0, length);
            bos.flush();
        }
        bis.close();
        bos.close();
    }

    private static void method7() throws IOException{
        BufferedInputStream bis = new BufferedInputStream(new FileInputStream("yf.txt"));
        BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream("yf8.txt"));

        int by;
        while ((by = bis.read()) != -1) {
            bos.write(by);
        }
        bis.close();
        bos.close();
    }

    private static void method6() throws IOException{
        FileInputStream fis = new FileInputStream("yf.txt");
        FileOutputStream fos = new FileOutputStream("yf7.txt");

        byte[] bytes = new byte[1024];
        int length;
        while ((length = fis.read(bytes)) != -1) {
            fos.write(bytes, 0, length);
            fos.flush();
        }
        fos.close();
        fis.close();
    }

    private static void method5() throws IOException{
        FileInputStream fis = new FileInputStream("yf.txt");
        FileOutputStream fos = new FileOutputStream("yf6.txt");

        int by;
        while ((by = fis.read()) != -1) {
            fos.write(by);
        }
        fos.close();
        fis.close();
    }

    private static void method4() throws IOException {
        BufferedReader br = new BufferedReader(new FileReader("yf.txt"));
        BufferedWriter bw = new BufferedWriter(new FileWriter("yf5.txt"));

        String s = null;
        while ((s = br.readLine()) != null) {
            bw.write(s);
            bw.newLine();
        }
        br.close();
        bw.close();
    }

    private static void method3() throws IOException {
        BufferedReader br = new BufferedReader(new FileReader("yf.txt"));
        BufferedWriter bw = new BufferedWriter(new FileWriter("yf4.txt"));

        char[] chars = new char[1024];
        int length;
        while ((length = br.read(chars)) != -1) {
            bw.write(chars, 0, length);
            bw.flush();
        }
        bw.close();
        br.close();
    }

    private static void method2() throws IOException {
        BufferedReader br = new BufferedReader(new FileReader("yf.txt"));
        BufferedWriter bw = new BufferedWriter(new FileWriter("yf3.txt"));

        int ch;
        while ((ch = br.read()) != -1) {
            bw.write(ch);
        }
        bw.close();
        br.close();
    }

    private static void method1() throws IOException {
        FileReader fr = new FileReader("yf.txt");
        FileWriter fw = new FileWriter("yf2.txt");

        char[] chars = new char[1024];
        int length;

        while ((length = fr.read(chars)) != -1) {
            fw.write(chars, 0, length);
            fw.flush();
        }
        fr.close();
        fw.close();
    }

    // 字符流5个方法 复制
    // 第一 OutputStreamWriter FileWriter InputStreamReader FileReader
    //      BufferWriter BufferReader 特有方法 newLine
    private static void method() throws IOException {
        FileReader fr = new FileReader("yf.txt");
        FileWriter fw = new FileWriter("yf1.txt");

        int ch;
        while ((ch = fr.read()) != -1) {
            fw.write(ch);
        }
        fw.close();
        fr.close();
    }
}