java_io流

package com.itheima;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

public class BufferedStreamDemo3 {
    public static void main(String[] args) throws IOException {
        String srcFileName = "FileWriterDemo.txt";
        String destFileName = "Copy.txt";

//        method1(srcFileName,destFileName);
//        method2(srcFileName,destFileName);
//        method3(srcFileName,destFileName);
//        method4(srcFileName,destFileName);
//        method5(srcFileName,destFileName);

    }
    public static void method5(String srcFileName,String destFileName) throws IOException {

        BufferedReader br=new BufferedReader(new FileReader(srcFileName)) ;
        BufferedWriter bw=new BufferedWriter(new FileWriter(destFileName)) ;


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

    public static void method4(String srcFileName,String destFileName) throws IOException {

        BufferedReader br=new BufferedReader(new FileReader(srcFileName)) ;
        BufferedWriter bw=new BufferedWriter(new FileWriter(destFileName)) ;

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

    public static void method3(String srcFileName,String destFileName) throws IOException {

        BufferedReader br=new BufferedReader(new FileReader(srcFileName)) ;
        BufferedWriter bw=new BufferedWriter(new FileWriter(destFileName)) ;

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


    public static void method2(String srcFileName,String destFileName) throws IOException {

        FileReader fr = new FileReader(srcFileName);
        FileWriter fw = new FileWriter(destFileName);

        char[] ch = new char[1024];
        int len;
        while((len = fr.read(ch))!=-1)
        {
            fw.write(ch,0,len);
        }
        fw.close();
        fr.close();
    }

    public static void method1(String srcFileName,String destFileName) throws IOException {

        FileReader fr = new FileReader(srcFileName);
        FileWriter fw = new FileWriter(destFileName);

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